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Spectra
2010 Porsche Cayenne Radiator 6 Cyl 3.6L Spectra

P311-265545B    CU2756  New

8012756 , 412756 , 7L6121253 , 13013 , 7L6121253A , 7L0121253 , 433651 , 2919 , 7L0121253A , 20211 , RAD2756 , A2756 , PO3010119 , 8819 , 13036 , 2055 , 2717 , 7L6121253C , 7L6121212B , 2756 , REA412756A , 95510614200 , 36719001 , 2622 , 7L6121253K , 0AVW6079 , 7L6121212A , CU2756 , C2756 , 95510614201 , 2982 , 103305 , 2872 , 2219210 , 3554

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Spectra Radiator
  • Radiator
  • Product Attributes:
    • California_Prop 65 Message:
      • May Cause Cancer Or Reproductive Harm
      • Y
  • The structure and design of Spectra Premium Radiators are built to undertake the same durability and expectations of that of the OE.
Brand: Spectra
Additional Fitment Information:
Vehicle Block Engine CID CC
2010 - Porsche Cayenne V 6 Cyl 3.6L 220 3597
TYC Products
2014 Porsche Cayenne Radiator 6 Cyl 3.6L TYC Products

P311-259AA1D    13551  New

95810613210 , PO3010123

Qty:
$161.61
TYC Products Radiator
  • TYC Radiator Assembly
  • ; Core Height (IN): 21.13 Core Length (IN): 27.56 Core Material: Aluminum Core Thickness (IN): 1.26 EOC (Yes/No): No Fin Count (Every 4"): 78 Fin Wave Height (IN): 0.25 Find Wave Pitch: 2.6 Flow Configuration: Crossflow Inlet Connection Type: Quick Connect (Spring Lock) Inlet Diameter (IN): 1.52 No. of Rows: 1 Outlet Connection Type: Quick Connect (Spring Lock) Outlet Diameter (IN): 1.52 TOC (Yes/No): No Total Fin Row Count: 69 Total Tube Count: 68 Tube Count (Every 4"): 13 Tube Width x Height: 32x1.5
  • Product Attributes:
    • Bottom Header: 2.02x22.06
    • Core Material: Aluminum
    • EOC (Yes/No): No
    • Fin Wave Height (IN): 0.25
    • Find Wave Pitch: 2.6
    • Flow Configuration: Crossflow
    • Inlet Connection Type: Quick Connect (spring Lock)
    • Outlet Connection Type: Quick Connect (spring Lock)
    • Top Header: 2.02x22.06
    • Total Fin Row Count: 69
    • Tube Count (Every 4"): 13
    • Tube Width x Height: 32x1.5
Brand: TYC Products
Additional Fitment Information:
Vehicle Transmission Block Engine CID CC
2014 - Porsche Cayenne Automatic V 6 Cyl 3.6L 219 3597
TYC Products
2014 Porsche Panamera Radiator 6 Cyl 3.6L TYC Products

P311-085F3ED    13562  New

97010613103 , PO3010124 , CU13562

Qty:
$235.29
TYC Products Radiator
  • TYC Radiator Assembly
  • ; Built-in Transmission Oil Cooler: No Core Height: 20.02 Core Length: 31.30 Core Material: Aluminum Flow Configuration: Crossflow Inlet Diameter: 1.61 Inlet Fitting Design: Quick Connect No. of Rows: 1 Outlet Diamter: 1.61 Outlet Fitting Design: Quick Connect Tank Material: Plastic Tube Width x Height: 1.259*0.078
  • Product Attributes:
    • Core Material: Aluminum
    • Flow Configuration: Crossflow
    • Inlet Fitting Design: Quick Connect
    • Outlet Fitting Design: Quick Connect
    • Tank Material: Plastic
    • Tube Width x Height: 1.259*0.078
Brand: TYC Products
Additional Fitment Information:
Vehicle Transmission Block Engine CID CC
2014 - Porsche Panamera Automatic V 6 Cyl 3.6L 220 3605
APDI
2010 Porsche Cayenne Radiator 6 Cyl 3.6L APDI

P311-054E89E    8012756  New

7L0121253 , 13036 , 2756 , 95510614201 , CU2756 , 376719001 , 65276A , 433651 , CRS2756 , 2872 , 13013 , 7L6121253K , 7L0121253A

Qty:
$166.87
APDI Radiator
  • Radiator
  • Product Attributes:
    • Construction: Plastic Tank Aluminum
    • Core Depth (in): 1-3/4
    • Core Height (in): 21-5/8
    • Core Width (in): 27-15/16
    • Inlet Connection (in): 1-1/2
    • Outlet Connection (in): 1-1/2
    • Rows: 1
  • Radiator - Audi, VW
Brand: APDI
Additional Fitment Information:
Vehicle Block Engine CID CC
2010 - Porsche Cayenne V 6 Cyl 3.6L 220 3597
APDI
2012 Porsche Boxster Radiator 6 Cyl 3.4L APDI

P311-405060F    8013165  New

99710613202 , CU13165 , PR13165A , 376733671 , 13165

Qty:
$307.41
APDI Radiator
  • Radiator
  • ; Right Side Radiator
  • Product Attributes:
    • Construction: Aluminum
    • Core Depth (in): 1-5/8
    • Core Height (in): 13-3/8
    • Core Width (in): 14-1/2
    • Inlet Connection (in): 1-9/16
    • Outlet Connection (in): 1-3/8
    • Rows: 1
  • Radiator - Porsche
Brand: APDI
Additional Fitment Information:
Vehicle Block Engine CID CC
2012 - Porsche Boxster H 6 Cyl 3.4L 210 3436
APDI
2010 Porsche Cayman Radiator 6 Cyl 3.4L APDI

P311-4FF2CE5    8013164  New

CU13164 , 376730581 , 13164 , 99710613102 , PR13164A

Qty:
$303.99
APDI Radiator
  • Radiator
  • ; Left Side Radiator
  • Product Attributes:
    • Construction: Aluminum
    • Core Depth (in): 1-5/8
    • Core Height (in): 13-3/8
    • Core Width (in): 14-1/2
    • Inlet Connection (in): 1-3/8
    • Outlet Connection (in): 1-9/16
    • Rows: 1
  • Radiator - Porsche
Brand: APDI
Additional Fitment Information:
Vehicle Block Engine CID CC
2010 - Porsche Cayman H 6 Cyl 3.4L 210 3436
APDI
2012 Porsche Cayman Radiator - Center 6 Cyl 3.4L APDI

P311-1F7038B    8013163  New

CU13163 , 376729531 , PR13163A , 99710603702 , 13163

Qty:
$291.99
APDI Radiator  Center
  • Radiator
  • ; Center Auxiliary Radiator
  • Product Attributes:
    • Construction: Aluminum
    • Core Depth (in): 1-5/8
    • Core Height (in): 4-7/8
    • Core Width (in): 24
    • Inlet Connection (in): 1-7/16
    • Outlet Connection (in): 1-7/16
    • Rows: 1
  • Radiator - Porsche
Brand: APDI
Position: Center
Additional Fitment Information:
Vehicle Position Block Engine CID CC
2012 - Porsche Cayman Center H 6 Cyl 3.4L 210 3436
APDI
2017 Porsche Macan Radiator 6 Cyl 3.6L APDI

P311-159CBA4    8013278  New

8K0121251H , 60318 , 2552 , 8K0121251Q , 13278 , 8K0121251AA , 13276 , 13310 , CU13278

Qty:
$151.02
APDI Radiator
  • Radiator
  • Product Attributes:
    • Construction: Plastic Tank Aluminum
    • Core Depth (in): 1-1/4
    • Core Height (in): 19-7/16
    • Core Width (in): 28-3/8
    • Inlet Connection (in): 1-1/2
    • Outlet Connection (in): 1-1/2
    • Rows: 1
    • Trans Oil Cooler (in): 11-13/16
  • Radiator - Audi
Brand: APDI
Additional Fitment Information:
Vehicle Region Block Engine CID CC
2017 - Porsche Macan Mexico V 6 Cyl 3.6L 220 3604
Nissens
2010 Porsche Cayenne Radiator - Front 8 Cyl 4.8L Nissens

P311-1B496EA    65276A  New

7L6.121.253 K , 95510614200 , 7L6.121.253 E , 7L6.121.253 B , 734740 , 7L0.121.253 A , 20221 , 955.106.4201 , 95510614201 , 7L6.121.253 A , 7L0.121.253 , 2756 , 9551064201

Qty:
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Nissens Radiator  Front
  • Radiator
  • ; Core dimension: 28" x 21 5/8" x 1 5/8" Height: 28" Thickness: 1 5/8" Width: 21 5/8"
  • Product Attributes:
    • Height: 28"
    • Thickness: 1 5/8"
    • Width: 21 5/8"
Brand: Nissens
Position: Front
Additional Fitment Information:
Vehicle Submodel Transmission Aspiration Fuel Type Manuf. Body Code Position Block Engine CID CC
2010 - Porsche Cayenne Turbo S Automatic Turbocharged GAS 955 Front V 8 Cyl 4.8L - 4806
Nissens
2015 Porsche Macan Radiator - Front 6 Cyl 3.0L Nissens

P311-295B137    60318  New

8K0.121.251 Q , 8K0.121.251 AA , 13278 , 8K0.121.251 AL

Qty:
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Nissens Radiator  Front
  • Radiator
  • ; Core dimension: 28 3/8" x 18 1/2" x 1 1/4" Height: 28 3/8" Thickness: 1 1/4" Width: 18 1/2"
  • Product Attributes:
    • Height: 28 3/8"
    • Thickness: 1 1/4"
    • Width: 18 1/2"
Brand: Nissens
Position: Front
Additional Fitment Information:
Vehicle Transmission Aspiration Fuel Type Manuf. Body Code Position Block Engine CID CC
2015 - Porsche Macan Automatic Dual Clutch Turbocharged GAS 95B Front V 6 Cyl 3.0L 183 2997
Nissens
1999 Porsche 911 Radiator - Right 6 Cyl 3.4L Nissens

P311-26E5881    63776  New

734826 , 996 106 132 73 , 2142R , 996.106.132.51 , 150181

Qty:
$205.40
  • Radiator
  • ; Transmission: STANDARD/AUTO Core dimension: 13 1/4" x 14 1/8" x 1 3/8" Height: 13 1/4" Thickness: 1 3/8" Width: 14 1/8"
  • Product Attributes:
    • Height: 13 1/4"
    • Thickness: 1 3/8"
    • Width: 14 1/8"
Brand: Nissens
Position: Right
Additional Fitment Information:
Vehicle Submodel Fuel Type Manuf. Body Code Position Block Engine CID CC
1999 - Porsche 911 Carrera GAS 996 Right H 6 Cyl 3.4L - 3400
Nissens
2004 Porsche Boxster Radiator - Left 6 Cyl 3.2L Nissens

P311-5BB8D34    63777  New

996.106.131.51 , 99610613181 , 150191 , 2142L , 734827

Qty:
$211.13
  • Radiator
  • ; Transmission: STANDARD/AUTO Core dimension: 13 1/4" x 14 1/8" x 1 3/8" Height: 13 1/4" Thickness: 1 3/8" Width: 14 1/8"
  • Product Attributes:
    • Height: 13 1/4"
    • Thickness: 1 3/8"
    • Width: 14 1/8"
Brand: Nissens
Position: Left
Additional Fitment Information:
Vehicle Fuel Type Manuf. Body Code Position Block Engine CID CC
2004 - Porsche Boxster GAS 986 Left H 6 Cyl 3.2L - 3179
Nissens
2016 Porsche Cayenne Radiator - Front 6 Cyl 3.0L Nissens

P311-2EC7F2D    65297  New

95810613210 , 13551 , 7P0.121.253 A

Qty:
$178.81
Nissens Radiator  Front
  • Radiator
  • ; Core dimension: 27 1/2" x 21" x 1 1/4" Height: 27 1/2" Thickness: 1 1/4" Width: 21"
  • Product Attributes:
    • Height: 27 1/2"
    • Thickness: 1 1/4"
    • Width: 21"
Brand: Nissens
Position: Front
Additional Fitment Information:
Vehicle Submodel Transmission Region Aspiration Fuel Type Manuf. Body Code Position Block Engine CID CC
2016 - Porsche Cayenne S E-Hybrid Automatic United States Supercharged ELECTRIC/GAS 958 Front V 6 Cyl 3.0L 183 2995
Nissens
2016 Porsche Panamera Radiator - Auxiliary 6 Cyl 3.0L Nissens

P311-2EC7F2D    65297  New

95810613210 , 13551 , 7P0.121.253 A

Qty:
$178.81
Nissens Radiator  Auxiliary
  • Radiator
  • ; Core dimension: 27 1/2" x 21" x 1 1/4" Height: 27 1/2" Thickness: 1 1/4" Width: 21"
  • Product Attributes:
    • Height: 27 1/2"
    • Thickness: 1 1/4"
    • Width: 21"
Brand: Nissens
Position: Auxiliary
Additional Fitment Information:
Vehicle Transmission Aspiration Fuel Type Position Block Engine CID CC
2016 - Porsche Panamera Automatic Supercharged ELECTRIC/GAS Auxiliary V 6 Cyl 3.0L 183 2997
One Stop Solutions
2010 Porsche Cayenne Radiator 6 Cyl 3.6L One Stop Solutions

P311-0D22496    2756  New

A2756 , CU2756 , 8012756 , VW3010146 , 7L0121253A , 53864

Qty:
$203.60
One Stop Solutions Radiator
Brand: One Stop Solutions
Additional Fitment Information:
Vehicle Block Engine CID CC
2010 - Porsche Cayenne V 6 Cyl 3.6L 220 3597
One Stop Solutions
2016 Porsche Macan Radiator 6 Cyl 3.0L One Stop Solutions

P311-4F704B3    13278  New

8K0121251AA , AU3010147 , 8013278 , A13278

Qty:
$184.19
Brand: One Stop Solutions
Additional Fitment Information:
Vehicle Block Engine CID CC
2016 - Porsche Macan V 6 Cyl 3.0L 181 2967
Nissens
2011 Porsche Cayenne Radiator 6 Cyl 3.0L Nissens - Plastic Tank

P311-1D3915B    W0133-1923282  New

Qty:
$246.69
Nissens Radiator
  • Aluminum Core
  • ; Main 700x550x32mm
  • Plastic Tank
Brand: Nissens
Additional Fitment Information:
Vehicle Block Engine CID CC
2011 - Porsche Cayenne V 6 Cyl 3.0L 183 2995
Nissens
2011 Porsche Cayenne Radiator 6 Cyl 3.6L Nissens - Plastic Tank

P311-1D3915B    W0133-1923282  New

Qty:
$246.69
Nissens Radiator
  • Aluminum Core
  • ; 700x550x32mm
  • Plastic Tank
Brand: Nissens
Additional Fitment Information:
Vehicle Block Engine CID CC
2011 - Porsche Cayenne V 6 Cyl 3.6L 219 3597
Nissens
2014 Porsche Cayenne Radiator Nissens - Plastic Tank

P311-1D3915B    W0133-1923282  New

Qty:
$246.69
Nissens Radiator
  • Aluminum Core
  • Plastic Tank
Brand: Nissens
Additional Fitment Information:
Vehicle Fuel Type
2014 - Porsche Cayenne DIESEL
Nissens
2013 Porsche Cayenne Radiator Nissens - Plastic Tank

P311-1D3915B    W0133-1923282  New

Qty:
$246.69
Nissens Radiator
  • Aluminum Core
  • ; Engine Cooling
  • Plastic Tank
Brand: Nissens
Additional Fitment Information:
Vehicle Aspiration
2013 - Porsche Cayenne Supercharged

Latest Porsche Repair and Radiator Installation Advice

CarJunky AutoAdvice

Excessive Coolant System Pressure (Head Gasket)

Showing 2 out of 19 Posts | Show 17 Hidden Posts
Question From 02civicturbo on Excessive Coolant System Pressure (Head Gasket)

i have a 2002 honda civic ex that is having engine trouble at the moment and i think i have narrowed it down but i am not sure and would like some opinions/advice.

the issue i am facing is a constant high pressure in my cooling system, after driving the radiator cap is venting due to pressure building above its rated pressure and even after sitting overnight the hoses are rock hard and the pressure does not subside.

i am leaning towards the head gasket but i do not have any oil in the coolant, coolant in the oil, white smoke from the exhaust and the coolant does not smell of exhaust gases.

i have done a compression test and a leak down test and compression test results show cylinder 1 at 170, cylinder 2 at 170, cylinder 3 at 160 and cylinder 4 at 150 (with a stock compression ratio of 9.9:1 but i have a turbo at 12 psi most likely making it around 10:1/11:1) and the leak down test results showed no real differences and nothing above 3 pounds leaking.

sometimes when i start the car cold i hear a metal scraping noise which goes away once started, possible piston ring scrapping the cylinder wall ?

i do not want to tear the motor down if i cannot accurately blame the head gasket.

any advice, opinions or answers are highly appreciated and thanks in advance.

Response From Tom Greenleaf

This isn't making much sense. How can the cooling system maintain pressure overnight? NOT. Compression is not so great. You mention rad cap releasing pressure - any coolant loss? Smell it? NO - you could test it for combustion gasses would be one of many tests.

If you just release pressure when cold. Feel a radiator hose or have a pressure tester on it. Be quick if using pressure tester and ready to release over pressure instantly and if pressure builds up fast not just expansion by warming up that is damning of combustion gasses getting into cooling system. Damning of head gasket or flaw with head perhaps which you really can't know without being there. If those two lower cylinder's pressure reading are abutting each other one may be leaking to the other via head gasket or metal flaw/crack.

You didn't say but it must be overheating? Head gasket highly likely IMO,

T

Response From Discretesignals

Did you pressure test the radiator cap to make sure it was venting off at the rated pressure?

Response From Tom Greenleaf

Right on DS - test cap too. Any decent pressure tester will test caps too. Many can just be cleaned but the one little thing is quite important to the system. If I understand back a couple, then as said it really can't do anything but lose pressure when cooler as the coolant lost volume due to decrease in temp.

If going by just squeezing a hose and it still feels firm it may be the hose somehow got to be hard, most go softer with time,

T

Response From 02civicturbo

no i had not tested the cap yet, i was looking into why there is always so much pressure in the cooling system, i will change that cap once i find the issue.

seems to me to be a head gasket issue but without the head gasket symptoms.

i am not overheating and has not overheated and to make sure the gauge was working correctly, i released the coolant and let the car run and it began to overheat, shut the car down, added the coolant back and bleed it and then started the car again and it would not overheat.

on the way home from work the other day i was getting fluid on my windshield and thought it was drizzling outside seeing it had rained and the road was wet so i turned my wipers on and looked around to see that no other vehicles on the road had their wipers on so i knew then it was coolant out of the cap coming back onto my windshield and have parked the car since trying to determine if it is the head gasket.

i am 95% sure it is but i am looking for other opinions or experiences similar to mine before i pull the block down.

i am no certified master mechanic but i can fix just about anything i need to including the head gasket but all the years i have been working on cars i have never seen this.

so my main theory as of right now is that exhaust is leaking through into the water jacket and pushing itself into my cooling system, what is your thoughts on this happening without the usual head gasket symptoms being shown ?

Response From Tom Greenleaf

NO! Do not test overheating by letting coolant out - OMG! Sensor for car's gauge could be late if in air not liquid. Keep that up and YOU WILL need a head gasket even if not now.......

T

Response From 02civicturbo

i never let it all out just enough to speed up the process, once the gauge hit above where it is supposed to be i cut the car off, i am not going to kill my car, i was just testing the gauge.

i will be tearing the block down tomorrow and looking into my head gasket and seals, valves and pistons, etc and will let you all know what the problem is.

Response From Hammer Time

i will be tearing the block down tomorrow and looking into my head gasket and seals, valves and pistons, etc and will let you all know what the problem is.

That's not how you find a problem. You do your testing before you take it apart.

Response From Tom Greenleaf

Sport - Some common sense before you attack this thing to never run again. Look at your first post. Excessive pressure. How did you come to believe that? Again how could it hold that pressure overnight? NO.

Pressure testers that I'm familiar with if just left on a cold engine warming up do not release pressure by themselves if that's what you did. Perhaps some do? That would go as high as the system would allow and the weakest part would blow if just left on.

As Hammer just said. Do all you testing now as you can't know much more with it apart unless something is really obvious. If head does need to come off send it out to get checked anyway even if nothing seen by you,

T

Response From 02civicturbo

usually when pressure builds up in the cooling system it is due to the coolant expanding, so after sitting overnight and cold to the touch the hoses should not be hard and the pressure should have released due to the coolant cooling and contracting to normal which it may or may not be doing, if it is then there is air/exhaust in the system coming from somewhere.

somehow air or exhaust is entering the cooling system, there is only 2 ways this can happen and either comes from a bad head gasket, to break the 2 ways down it is either exhaust or compressed air from the turbo, seeing boost is not what it used to be and i do not have a boost or exhaust leak visible on the exterior motor it has to be inside the block.

after doing a compression and a leak down test and coming to the conclusion compression is fine and it is iffy on the leak down there is either a bad head gasket, bent/stuck valve or bad piston rings.

since there is no white/black smoke it is hard to determine and the block has to be torn down.

i will test the radiator cap and thermostat but since i am not overheating and i know the temperature sender is working i have no other way to go but inside the block for examination.

hopefully it is just the gasket and the head itself is not cracked or warped, over a 100,000 miles and having the head milled usually ends up in disaster.

i can tell you this for a fact if it is the gasket then it just started and i caught it early enough to possibly have the head milled and not have to worry about issues in the bottom half of the motor due to improper compressions, etc.

Response From Hammer Time

usually when pressure builds up in the cooling system it is due to the coolant expanding, so after sitting overnight and cold to the touch the hoses should not be hard and the pressure should have released due to the coolant cooling and contracting to normal which it may or may not be doing, if it is then there is air/exhaust in the system coming from somewhere.

somehow air or exhaust is entering the cooling system, there is only 2 ways this can happen and either comes from a bad head gasket, to break the 2 ways down it is either exhaust or compressed air from the turbo, seeing boost is not what it used to be and i do not have a boost or exhaust leak visible on the exterior motor it has to be inside the block.

Your logic is because you think you have pressure holding overnight that you have a blown head gasket

Dude, you are lost here. Your logic is way out in left field. You need to let a professional look at this before you turn it into a pile of scrap steel.

Response From 02civicturbo

i know my car and i can tell you that the hoses are rock hard and cannot be squeezed when the engine is at operating temperature and when cool should be somewhat squeezable.

when driving after a while there is fluid being blown up onto the windshield from the radiator cap.

this morning after the car has been sitting for 3 days the hoses were still rock hard and when i opened the radiator cap the fluid blew out of the radiator.

there is no question in my mind it has to do with air or something entering the system somewhere and the pressure is not easing off, there is no leaks, holes, tears, cracks in my hoses.

i have checked the coolant, the oil and the gearbox oil and none of it is mixing with each other, if i am lost and the 3 other opinions i have gotten are way out in left field then
asking another mechanic would do me no good seeing my brother-in-law is a mechanic and thinks it is head gasket or valve related.

i know this place is not a help hotline, i am merely using it for other opinions, so based on what i have mentioned what is your opinion tom and hammer ?

Response From sometech Top Rated Answer

im currently having a similar problem with a Porsche 996. after replacing the radiator cap and resurfacing the cylinder heads the car has returned with the same problem. the customer complained of a hissing noise coming from the coolant expansion tank. after a drive i did not hear much of a noise. i parked the car over night. i took off the cap off the (now cold) expansion tank and coolant will burst out because somehow it is still retaining full pressure in the system. it is a mystery that makes absolutely no sense. when i find an answer i will be sure to note it, but for no all i can say is it defies all logical sense.

Response From Tom Greenleaf

Thread now locked and is over a year old never mind another's thread and type of car. Please read rules to post and start your own thread with your own specifics not hijack another,


T

Response From Discretesignals

Coolant shouldn't be blowing out of the radiator cap onto your windshield. Even if the cap was blowing off excessive pressure, the pressure should be purging off into the overflow bottle. You might want to inspect the seal inside the cap and test your cap's pressure rating.

When you did your leak down check, was there any bubbles in the radiator?

Response From Tom Greenleaf

We are ALL just volunteering our time for free - know that w no mal intent and nothing to gain.

Have you tested the pressure cap yet? How could you not be losing coolant if it can spray all over windshield? The holding pressure if really so for now up to 3 days seems impossible but I suppose since you released pressure after that time the cap can hold WAY too much pressure that even as engine cools off still hold some. THAT WILL USUALLY BLOW HOSES, WATER PUMP, RADIATOR OR HEATER CORE NOT A GASKET AND HAVE NEVER SEEN A CAP DO THAT EVER. That cap should be marked with it's pressure rating and testing it should let go by that #. If not toss that one. If your tester can't test it then just toss it as it's the regulator for cooling system pressure and release.

Can't know much more till that issue alone is fixed or known. If you take it apart you could still test the cap but no more system checking as already said,

T

Response From ash

Just a query mate, does your car has a factory fitted turbo.
Also if you fitted a turbo in it , the coolant will be at higher temperature and the radiator cap should be of high rated.

Response From Hammer Time

Just a query mate, does your car has a factory fitted turbo.
Also if you fitted a turbo in it , the coolant will be at higher temperature and the radiator cap should be of high rated.

OK, some more completely flawed logic


Response From Tom Greenleaf

"usually when pressure builds up in the cooling system it is due to the coolant expanding, so after sitting overnight and cold to the touch the hoses should not be hard and the pressure should have released due to the coolant cooling and contracting to normal which it may or may not be doing, if it is then there is air/exhaust in the system coming from somewhere."

What on earth could be adding pressure overnight - please inform me of much of anything but water freezing that stays the same hot or cool/cold. I sqeeze hoses too if only to quick know that it's ok to remove a pressure cap. If it held overnight and you could realease pressure and hear it at the cap something I've never heard of is happening. That's unless someone sneaks out and is playing tricks on you. The hose could just be hard all the time for all I know.

This is the observation you began with. It doesn't overheat if full of coolant, no symtoms mentioned (sorry if I missed something now) except this excessive pressure. Probably if things are tight it would build up to ~ 15 PSI which does feel like a good bit of pressure - Normally. You certainly can drive a common tire on that much.

Seems not much is conclusive yet to me or flawed observations? - Tom

(just know we volunteer and not always on line waiting so don't think the site is some 911 call 24/7 so if no quick response wait or another jumps in)