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While an engine generates a lot of heat, there are certain situations where it would not be beneficial for coolant to be flowing through the radiator and cooling down. All motors operate most efficiently within a narrow temperature range, and the cooling system is designed not to keep the engine as cool as possible, but to actually keep it within this specific range of temperature values. A key component in making this happen is the thermostat. The thermostat is a device that is placed in-line with the piping leading from the engine block to the radiator. There is a temperature sensor inside of the thermostat that measures the surrounding water to determine if it is necessary for it to cool down. If it is above a certain value, usually 195 degrees or greater, the thermostat stays open and the coolant is able to circulate to the radiator. However, if the liquid temperature is below this value, a valve inside the thermostat seals off the passage to the radiator, and the coolant is shunted back inside the engine so it can warm up. A thermostat is particularly useful for people who live in cold climates, as the temperature of the coolant when they start the car is usually below zero on a winter’s day. In order to help get the engine’s temperature back up to operating range as quickly as possible, the thermostat stays closed from the moment the car is started until it finally warms up enough to provide normal operation.

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Best Selling Genuine Replacement Thermostats

  • Constantly Updated Inventory of Replacement Thermostat Parts
  • We stock Discount Thermostat OEM Parts

We stock Thermostat parts for most makes, including AM General, Acura, Audi, Austin, BMW, Buick, Cadillac, Chevrolet, Chrysler, Daewoo, Daihatsu, Datsun, Dodge, Eagle, Emergency One, Fiat, Ford, Foton, Freightliner, GMC, Geo, Grande West, Honda, Hummer, Hyundai, Infiniti, International, Isuzu, Jaguar, Jeep, Kenworth, Kia, Land Rover, Lexus, Lincoln, MASA, MG, Mack, Mazda, Mercedes Benz, Mercury, Merkur, Mini, Mitsubishi, Nissan, Oldsmobile, Peugeot, Plymouth, Pontiac, Porsche, Ram, Renault, Rover, Saab, Saturn, Scion, Smart, Sterling, Sterling Truck, Subaru, Suzuki, Temsa Bus, Toyota, Triumph, VAM, Volkswagen, Volvo, Western RV, Western Star.


Mahle
2001 BMW 320i Engine Coolant Thermostat Mahle - Behr with Housing & Seal

P311-42D7231    W0133-1662661  New

Qty:
In Stock & Ready to Ship
$76.40
Mahle Engine Coolant Thermostat
  • 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.
  • With Housing and Seal
  • Behr with Housing & Seal
  • W/ Housing
Brand: Mahle
Additional Fitment Information:
Vehicle
2001 - BMW 320i
Mahle
2004 BMW 330i Engine Coolant Thermostat Mahle - Behr with Housing & Seal

P311-42D7231    W0133-1662661  New

Qty:
In Stock & Ready to Ship
$76.40
Mahle Engine Coolant Thermostat
  • 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.
  • Behr with Housing & Seal
Brand: Mahle
Additional Fitment Information:
Vehicle
2004 - BMW 330i
ACDelco
2007 Chevrolet Corvette Engine Coolant Thermostat ACDelco - w/o O-Ring

P311-3D33C49    W0133-1783286  New

Qty:
In Stock & Ready to Ship
$40.26
ACDelco Engine Coolant Thermostat
  • 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.
  • Genuine GM
  • w/o O-Ring
Brand: ACDelco
Additional Fitment Information:
Vehicle
2007 - Chevrolet Corvette
ACDelco
1999 Chevrolet Silverado 1500 Engine Coolant Thermostat 8 Cyl 4.8L ACDelco

P311-3787E2C    W0133-1783287  New

Qty:
In Stock & Ready to Ship
$75.42
ACDelco Engine Coolant Thermostat
  • 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.
  • Genuine GM
  • Includes Coolant Outlet Housing and Gasket
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
1999 - Chevrolet Silverado 1500 V 8 Cyl 4.8L 294 -
ACDelco
1999 GMC C3500 Engine Coolant Thermostat 8 Cyl 7.4L ACDelco - 195F / 91C

P311-0438E89    W0133-1694589  New

Qty:
In Stock & Ready to Ship
$26.40
ACDelco Engine Coolant Thermostat
  • 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.
  • Genuine GM
  • 195F / 91C
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
1999 - GMC C3500 V 8 Cyl 7.4L 454 -
ACDelco
2013 Buick Verano Engine Coolant Thermostat ACDelco

P311-1D50E6E    W0133-1866553  New

Qty:
In Stock & Ready to Ship
$93.91
ACDelco Engine Coolant Thermostat
  • 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.
  • Genuine GM
Brand: ACDelco
Additional Fitment Information:
Vehicle
2013 - Buick Verano
ACDelco
2014 Chevrolet Corvette Engine Coolant Thermostat ACDelco

P311-0846BBF    W0133-2550368  New

Qty:
In Stock & Ready to Ship
$79.41
ACDelco Engine Coolant Thermostat
  • 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.
  • Genuine GM
  • Includes Coolant Outlet Housing and O-Ring
Brand: ACDelco
Additional Fitment Information:
Vehicle
2014 - Chevrolet Corvette
ACDelco
2003 Buick Century Engine Coolant Thermostat ACDelco - 195F / 91C

P311-1A09B54    W0133-1682422  New

Qty:
In Stock & Ready to Ship
$38.94
ACDelco Engine Coolant Thermostat
  • 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.
  • Genuine GM
  • Includes Gasket
  • 195F / 91C
Brand: ACDelco
Additional Fitment Information:
Vehicle
2003 - Buick Century
ACDelco
1994 Buick Skylark Engine Coolant Thermostat 6 Cyl 3.1L ACDelco - 195F / 91C

P311-1A09B54    W0133-1682422  New

Qty:
In Stock & Ready to Ship
$38.94
ACDelco Engine Coolant Thermostat
  • 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.
  • Genuine GM
  • 195F / 91C
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
1994 - Buick Skylark V 6 Cyl 3.1L 189 -
Mahle
2009 Mercedes-Benz SLK350 Engine Coolant Thermostat Mahle

P311-43AAA08    W0133-1953845  New

Qty:
In Stock & Ready to Ship
$152.50
Mahle Engine Coolant Thermostat
  • 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.
  • Integrated Housing
Brand: Mahle
Additional Fitment Information:
Vehicle
2009 - Mercedes-Benz SLK350
ACDelco
2009 GMC Savana 2500 Engine Coolant Thermostat 8 Cyl 6.6L ACDelco

P311-5F4CEDF    W0133-1694073  New

Qty:
In Stock & Ready to Ship
$82.82
ACDelco Engine Coolant Thermostat
  • 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.
  • Genuine GM
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2009 - GMC Savana 2500 V 8 Cyl 6.6L 403 6599
ACDelco
2007 Chevrolet Silverado 2500 HD Engine Coolant Thermostat 8 Cyl 6.6L ACDelco

P311-4BD529D    W0133-1694074  New

Qty:
In Stock & Ready to Ship
$72.38
ACDelco Engine Coolant Thermostat
  • 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.
  • Genuine GM
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2007 - Chevrolet Silverado 2500 HD V 8 Cyl 6.6L 403 6599
Wahler
2006 Mercedes-Benz ML350 Engine Coolant Thermostat Wahler

P311-1F3EC67    W0133-1953845  New

Qty:
In Stock & Ready to Ship
$130.70
Wahler Engine Coolant Thermostat
  • 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.
  • Eng: 30 058377-
Brand: Wahler
Additional Fitment Information:
Vehicle Engine Range
2006 - Mercedes-Benz ML350 30 058377 and up
Wahler
2006 Mercedes-Benz ML350 Engine Coolant Thermostat Wahler

P311-1F3EC67    W0133-1953845  New

Qty:
In Stock & Ready to Ship
$130.70
Wahler Engine Coolant Thermostat
  • 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.
  • Eng: 30 058494-
Brand: Wahler
Additional Fitment Information:
Vehicle Engine Range
2006 - Mercedes-Benz ML350 30 058494 and up
Kuzeh
1995 Lexus SC400 Engine Coolant Thermostat Kuzeh - (82°C/180°F) w/o Gasket

P311-39BAD69    W0133-1917688  New

Qty:
In Stock & Ready to Ship
$28.10
Kuzeh Engine Coolant Thermostat
  • 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.
  • Thermostat Gasket part# 16325-62010 (Serviced Separately)
  • (82°C/180°F) w/o Gasket
Brand: Kuzeh
Additional Fitment Information:
Vehicle
1995 - Lexus SC400
Kuzeh
2001 Lexus ES300 Engine Coolant Thermostat Kuzeh - (82°C/180°F) w/o Gasket

P311-39BAD69    W0133-1917688  New

Qty:
In Stock & Ready to Ship
$28.10
Kuzeh Engine Coolant Thermostat
  • 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.
  • Water Inlet Tube O-Ring part # 96761-35031 and Thermostat Gasket part# 16325-62010 (Serviced Separately)
  • (82°C/180°F) w/o Gasket
Brand: Kuzeh
Additional Fitment Information:
Vehicle
2001 - Lexus ES300
Kuzeh
1997 Toyota Avalon Engine Coolant Thermostat Kuzeh - (82°C/180°F) w/o Gasket

P311-39BAD69    W0133-1917688  New

Qty:
In Stock & Ready to Ship
$28.10
Kuzeh Engine Coolant Thermostat
  • 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.
  • For JPP & USA Made Models - Water Inlet Tube O-Ring part # 96761-35031 and Thermostat Gasket part# 16325-62010 (Serviced Separately)
  • (82°C/180°F) w/o Gasket
Brand: Kuzeh
Additional Fitment Information:
Vehicle
1997 - Toyota Avalon
Kuzeh
2005 Scion tC Engine Coolant Thermostat Kuzeh - (82°C/180°F) w/o Gasket

P311-39BAD69    W0133-1917688  New

Qty:
In Stock & Ready to Ship
$28.10
Kuzeh Engine Coolant Thermostat
  • 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.
  • Production: 05/01/2004-08/31/2004, Thermostat Gasket part# 16325-62010 (Serviced Separately)
  • (82°C/180°F) w/o Gasket
Brand: Kuzeh
Additional Fitment Information:
Vehicle Prod. Date Range
2005 - Scion tC Fr:05-01-04 To:08-31-04
Kuzeh
2009 Toyota Matrix Engine Coolant Thermostat 4 Cyl 1.8L Kuzeh - (82°C/180°F) w/o Gasket

P311-39BAD69    W0133-1917688  New

Qty:
In Stock & Ready to Ship
$28.10
Kuzeh Engine Coolant Thermostat
  • 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.
  • with Centered jiggle Pin - Thermostat Gasket part# 16325-62010 (Serviced Separately)
  • (82°C/180°F) w/o Gasket
Brand: Kuzeh
Additional Fitment Information:
Vehicle Block Engine CID CC
2009 - Toyota Matrix L 4 Cyl 1.8L 110 1798
Wahler
2003 Porsche Boxster Engine Coolant Thermostat Wahler

P311-55DE574    W0133-1836323  New

Qty:
In Stock & Ready to Ship
$72.67
Wahler Engine Coolant Thermostat
  • 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.
  • with Operating Temperature - 83°C
  • Includes Coolant Outlet Housing and Seal
Brand: Wahler
Additional Fitment Information:
Vehicle
2003 - Porsche Boxster