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The heater core is a component of a vehicle’s cooling system that is used to help transfer the heat generated by the operation of the engine into the passenger compartment through the vehicle’s environmental control system. Since the primary product of an internal combustion engine is waste heat, the heater core doesn’t actually have to generate any heat itself. Instead, what it does is take the hot coolant which is coming out of the motor and run it through a series of curved pipes that are in turn surrounded by thin metal fins. If this sounds a lot like the car’s radiator, that is because they operate on exactly the same principal: the motion of the hot coolant through the pipes allows the fins to exchange heat with the air. This warm air is then blown in to the vehicle’s passenger compartment, while the slightly cooler antifreeze continues on along its path to the radiator. The heater core is obviously not always filled with coolant – the flow of antifreeze and water moving through the component is controlled by a valve or a door which opens and closes depending on the amount of heat requested by the driver. In a pinch, the heater core can be used as a ‘second radiator’, by turning heater controls to maximum warmth and bleeding off some engine heat through the heating ducts. Sometimes this can cool down an overheating motor enough to get it safely home or the garage – whichever happens to be closer.

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Metrix
2002 Lincoln Blackwood HVAC Heater Core Metrix

P311-409019F    W0133-2205977  New

Qty:
$67.69
Metrix HVAC Heater Core
Brand: Metrix
Additional Fitment Information:
Vehicle
2002 - Lincoln Blackwood
TYC
2002 Lincoln Blackwood HVAC Heater Core TYC

P311-36883CF    W0133-2205977  New

Qty:
$84.82
TYC HVAC Heater Core
Brand: TYC
Additional Fitment Information:
Vehicle
2002 - Lincoln Blackwood
Metrix
1997 Ford F-250 HVAC Heater Core Metrix

P311-409019F    W0133-2205977  New

Qty:
$67.69
Metrix HVAC Heater Core
  • with Under 8500 - Gross Vehicle Weight (GVW)
Brand: Metrix
Additional Fitment Information:
Vehicle
1997 - Ford F-250
TYC
1997 Ford F-250 HVAC Heater Core TYC

P311-36883CF    W0133-2205977  New

Qty:
$84.82
TYC HVAC Heater Core
  • with Under 8500 - Gross Vehicle Weight (GVW)
Brand: TYC
Additional Fitment Information:
Vehicle
1997 - Ford F-250
Metrix
1999 Lincoln Navigator HVAC Heater Core Metrix

P311-409019F    W0133-2205977  New

Qty:
$67.69
Metrix HVAC Heater Core
  • Main Unit
Brand: Metrix
Additional Fitment Information:
Vehicle
1999 - Lincoln Navigator
TYC
1999 Lincoln Navigator HVAC Heater Core TYC

P311-36883CF    W0133-2205977  New

Qty:
$84.82
TYC HVAC Heater Core
  • Main Unit
Brand: TYC
Additional Fitment Information:
Vehicle
1999 - Lincoln Navigator
Metrix
2002 Lincoln Navigator HVAC Heater Core Metrix

P311-409019F    W0133-2205977  New

Qty:
$67.69
Metrix HVAC Heater Core
  • For Main Heater/Air Condition
Brand: Metrix
Additional Fitment Information:
Vehicle
2002 - Lincoln Navigator
TYC
2002 Lincoln Navigator HVAC Heater Core TYC

P311-36883CF    W0133-2205977  New

Qty:
$84.82
TYC HVAC Heater Core
  • For Main Heater/Air Condition
Brand: TYC
Additional Fitment Information:
Vehicle
2002 - Lincoln Navigator
Metrix
2012 Jeep Liberty HVAC Heater Core Metrix

P311-18EA774    W0133-1882873  New

Qty:
$134.90
Metrix HVAC Heater Core
Brand: Metrix
Additional Fitment Information:
Vehicle
2012 - Jeep Liberty
ACDelco
2007 GMC Sierra 1500 HVAC Heater Core ACDelco

P311-5B06141    W0133-1687122  New

Qty:
$278.03
ACDelco HVAC Heater Core
  • This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
  • GM Original Equipment
Brand: ACDelco
Additional Fitment Information:
Vehicle Submodel Engine Designation Body
2007 - GMC Sierra 1500 WT LY5 Standard Cab Pickup
ACDelco
2003 GMC Yukon HVAC Heater Core ACDelco

P311-5B06141    W0133-1687122  New

Qty:
$278.03
ACDelco HVAC Heater Core
  • This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
  • GM Original Equipment
  • with Heavy Duty Heater
Brand: ACDelco
Additional Fitment Information:
Vehicle
2003 - GMC Yukon
ACDelco
2003 GMC Sierra 3500 HVAC Heater Core 8 Cyl 6.6L ACDelco

P311-5B06141    W0133-1687122  New

Qty:
$278.03
ACDelco HVAC Heater Core
  • This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
  • GM Original Equipment
  • Excludes Heavy Duty Heater
Brand: ACDelco
Additional Fitment Information:
Vehicle Submodel Body Block Engine CID CC
2003 - GMC Sierra 3500 Base Crew Cab Pickup V 8 Cyl 6.6L 403 6599
ACDelco
2005 Chevrolet Avalanche 2500 HVAC Heater Core ACDelco

P311-5B06141    W0133-1687122  New

Qty:
$278.03
ACDelco HVAC Heater Core
  • This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
  • GM Original Equipment
  • w/o Heavy Duty Heater
Brand: ACDelco
Additional Fitment Information:
Vehicle
2005 - Chevrolet Avalanche 2500
ACDelco
2007 Chevrolet Silverado 3500 Classic HVAC Heater Core ACDelco

P311-5B06141    W0133-1687122  New

Qty:
$278.03
ACDelco HVAC Heater Core
  • This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
  • GM Original Equipment
  • Exc.Custom Front Floor Console
Brand: ACDelco
Additional Fitment Information:
Vehicle Submodel Body
2007 - Chevrolet Silverado 3500 Classic LT Extended Cab Pickup
ACDelco
2007 Cadillac Escalade HVAC Heater Core ACDelco

P311-5B06141    W0133-1687122  New

Qty:
$278.03
ACDelco HVAC Heater Core
  • This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
  • GM Original Equipment
  • ForMain Heater
Brand: ACDelco
Additional Fitment Information:
Vehicle
2007 - Cadillac Escalade
ACDelco
2007 GMC Yukon XL 1500 HVAC Heater Core ACDelco

P311-5B06141    W0133-1687122  New

Qty:
$278.03
ACDelco HVAC Heater Core
  • This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
  • GM Original Equipment
  • Exc.Heavy Duty Heater
Brand: ACDelco
Additional Fitment Information:
Vehicle
2007 - GMC Yukon XL 1500
ACDelco
2007 Chevrolet Silverado 2500 HD HVAC Heater Core ACDelco

P311-5B06141    W0133-1687122  New

Qty:
$278.03
ACDelco HVAC Heater Core
  • This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
  • GM Original Equipment
  • ForAuxiliary Unit
Brand: ACDelco
Additional Fitment Information:
Vehicle
2007 - Chevrolet Silverado 2500 HD
ACDelco
2008 GMC Sierra 1500 HVAC Heater Core 8 Cyl 5.3L ACDelco

P311-5B06141    W0133-1687122  New

Qty:
$278.03
ACDelco HVAC Heater Core
  • This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
  • GM Original Equipment
  • For Auxiliary Heater
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2008 - GMC Sierra 1500 V 8 Cyl 5.3L 325 5328
ACDelco
2008 Hummer H2 HVAC Heater Core ACDelco

P311-5B06141    W0133-1687122  New

Qty:
$278.03
ACDelco HVAC Heater Core
  • This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
  • GM Original Equipment
  • ForMain Unit
Brand: ACDelco
Additional Fitment Information:
Vehicle
2008 - Hummer H2
ACDelco
2009 GMC Yukon XL 1500 HVAC Heater Core ACDelco

P311-5B06141    W0133-1687122  New

Qty:
$278.03
ACDelco HVAC Heater Core
  • This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
  • GM Original Equipment
  • For Main Heater
Brand: ACDelco
Additional Fitment Information:
Vehicle
2009 - GMC Yukon XL 1500

Latest Heater Core Repair and Installation Advice

CarJunky AutoAdvice

heater core dodge durango 1999 4x4

Showing 2 out of 4 Posts | Show 2 Hidden Posts
Question From sololoco on heater core dodge durango 1999 4x4

Hi there to all, i am just about to take out the heater core, but i cant see the easy way to do it, is there one?

Response From fordtech Top Rated Answer

there is really no easy way to remove the heater core , a/c needs to be recovered as evaporater needs to be removed with the heater core. fyi not all the aftermarket heat core are the same size as the factory ones. it call for about 5.5 hours to r&r the heater core on this one. good luck

Response From sololoco

OH boyo!!!, that is what i was afraid of,, thanks a lot my good man.

Response From Hammer Time

The whole story is the entire dash has to be removed first and then the entire HVAC housing has to be removed and disassembled.

bypassing a heater core on a 99 Blazer

Showing 2 out of 2 Posts
Question From Heather0507 on bypassing a heater core on a 99 Blazer

I've been having problems with the heater core on my 1999 4wd Chevy Blazer. Just about everyone I've talked to has mentioned removing the entire dash. I've also heard about a temporary fix that requires looping the hoses to the heater core, which bypasses the heater core all together. What is the easieset way to loop the hoses? I don't have the funds right now to replace the heater core, and I'd rather not have to remove the entire dash to loop the hoses if at all possible.

Response From way2old Top Rated Answer

Look under the hood where the hoses go into the firewall. There should be clamps on the hoses. Remove these clamps and the hoses. Place a connector in the 2 hoses that will not crimp and block the flow of coolant. And you have bypassed the heater core. You might need to repair the heater core before long. If you are in a cooler climate, the weather is gonna change soon.

one last heater core question

Showing 2 out of 3 Posts | Show 1 Hidden Posts
Question From deelo on one last heater core question

so..i got the heater core out finally..thanks to you guys' help, so the hoses were spliced to bypass the old heater core so i take out the splice and now i have two hoses but which goes where, the heater core doesnt seem to be labeled with an in/out or anything? thanks.

Response From steve01832

The order of the hoses doesn't matter. As long as the coolant flows through it you will have heat. When you take the line coupler apart, the hoses should bend towards the appropriate pipe they were originally connected to. But, like I said, it's bidirectional.

Steve

Response From Tom Greenleaf Top Rated Answer

Many are different ID hoses and will only go on one way, T

REPLACE HEATER CORE

Showing 2 out of 8 Posts | Show 6 Hidden Posts
Question From JA5PER5 on REPLACE HEATER CORE

CAN SOMEONE HELP ME I NEED TO REPLACE THE HEATER CORE IN MY 1991 PONTIAC TRANS AM I HAVE 70,000 MILES AND A 350 ENGINE, MY QUESTION IS WILL I NEED TO TAKE OUT THE GAS IN MY AIR COND. SYSTEM TO REPLACE THE HEATER CORE? PLEASE HELP
THANKS

Response From Tom Greenleaf

Wish I knew specifics but it's possible you do need to take "evaporator" out at the same time. This would mean recovering existing refrigerant for return later. Use new "O" rings as needed and Nylog or I like pure silicone grease for those. Just a smear!

They are a pill but doable with enough time and patience,

T

Hit back if you need help recharging A/C. It's posted here in good detail anyway at this section - subject line in all caps....

Response From JA5PER5

THANK YOU FOR THE INFORMATION, AND THE DIAGRAMS .YES I STILL DO HAVE THE R12 IN THE SYSTEM I'M NOT SURE IF I NEED TO WORRY ABOUT THE AIR COND. SYSTEM?? I WOULD LIKE TO FIX IT MYSELF AND NOT SPEND THE EXTRA CASH.
THANKS AGAIN

Response From Hammer Time Top Rated Answer

No, it doesn't appear that you will have to evacuate the refrigerant to remove the heater core.

Response From Tom Greenleaf

You'll know as you get there. Legalities or not just be real careful as if you open a line it can freeze the skin right off you.

Unless you live in the hottest of climates switching to 134a will still work fine or find new R-12 which is out there but does cost more and is restricted to buy,

T

Response From Hammer Time

That was a evap core, I'll get the heater instr.

The heater core is much harder because the dash and console have to be removed.




  1. To avoid personal injury when servicing models equipped with Supplemental Inflatable Restraint (Airbag) System, temporarily disarm system. Refer to Air Bags and Seat Belts/Air Bags (Supplemental Restraint Systems)/Service and Repair.
  2. Disconnect battery ground cable and drain cooling system.
  3. Remove instrument panel and center console.
  4. Remove heater case, Fig. 21.
  5. Remove heater core shroud screws, then separate heater case assembly.
  6. Remove core mounting strap, then the core.
  7. Reverse procedure to install.
  8. After completing service procedure activate Supplemental Inflatable Restraint (Airbag) System. Refer to MAINTENANCE PROCEDURES/AIRBAG SYSTEM DISARMING.


Dash removal



  1. Disable airbag system as described under MAINTENANCE PROCEDURES/AIRBAG SYSTEM DISARMING.
  2. Disconnect battery ground cable.
  3. Turn ignition to the Off position, then remove fuse No. 10 from fuse panel.
  4. Disconnect position assurance (CPA) and yellow two-way (SIR) harness connector at base of steering column.
  5. Remove shifter handle and seven shift gate trim plate attaching screws.
  6. Remove radio and A/C heater controller trim plate.
  7. Remove A/C heater controller attaching screws, then pull controller rearward and disconnect electrical connections, vacuum connections and remove heater control cable.
  8. Remove four radio retaining screws, then pull radio rearward and disconnect the power, speaker and antenna connectors.
  9. Disconnect all console electrical connectors.
  10. Remove six console hold down and two console to instrument panel screws and remove console.

  1. Remove instrument panel trim pad and hush panels, Figs. 154 through 157.
  2. Remove right and left lower instrument panel covers and trim plates, Figs. 158 and 159.
  3. Remove six instrument cluster attachment screws, then pull cluster back and disconnect speedometer cable and electrical connections.
  4. Remove headlight switch assembly.
  5. Lower the steering column, then remove five upper and six lower instrument panel carrier to cowl screws.
  6. Disconnect instrument panel electrical harness at bulkhead connector and under dash.
  7. Remove instrument panel carrier, Fig. 160.
  8. Reverse procedure to install.
  9. Reactivate airbag system as described under MAINTENANCE PROCEDURES/AIRBAG SYSTEM DISARMING.

Response From Tom Greenleaf

Thanks Hammer!

That earns you company stars.......



You can cash those in at the company store and still have nothing but wall paper


T

Response From Tom Greenleaf

To add: Are you still with R-12 or swapped already to 134a? It matters! It's getting hard to find places to help with recovering R-12 and if you are already 134a just use new stuff and take contamination out of the game,

T

please help heater core

Showing 2 out of 4 Posts | Show 2 Hidden Posts
Question From shupekryan on please help heater core

i have a 2005 suzuki forenza have the dash including the climate control cluster taken out and cannot find the heater core....i see what looks like the blower motor and evaporator for the a/c but do not see the heater core..anything helps greatly appreciated

Response From Timthecarguy719 Top Rated Answer

Can you look under the hood and see two hoses going into the firewall?
Behind those hoses on the inside of the car is your heater core.

Response From re-tired

You can say that again , You can say that again

Response From re-tired

Look for the pipes that the the heater hoses hook up to , thats where the heater will be . The core itself will be in the case.