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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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The Following brands are available based on your search.

  • ACDelco
    ACDelco
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    AISIN
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    APA/URO Parts
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    Aisin
  • Auto 7
    Auto 7
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    Beck Arnley
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    Behr
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    CRP
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    Meyle
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    Mr Gasket
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    URO Parts
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    Vemo
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    Wahler
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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, Dodge, Eagle, Fiat, Ford, Freightliner, GMC, Geo, Honda, Hummer, Hyundai, Infiniti, International, Isuzu, Jaguar, Jeep, Kenworth, Kia, Land Rover, Lexus, Lincoln, 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, Toyota, Triumph, Volkswagen, Volvo, Western RV, Western Star.


ACDelco
2001 Chevrolet Suburban 2500 Engine Coolant Thermostat 8 Cyl 8.1L ACDelco

P311-0438E89    W0133-1694589  New

Qty:
25.44
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
  • ; Except Integrated Housing Design

    w/o Housing
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2001 - Chevrolet Suburban 2500 V 8 Cyl 8.1L 496 -
ACDelco
2000 GMC Savana 3500 Engine Coolant Thermostat 8 Cyl 7.4L ACDelco

P311-0438E89    W0133-1694589  New

Qty:
25.44
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
2000 - GMC Savana 3500 V 8 Cyl 7.4L 454 -
ACDelco
1997 Chevrolet P30 Engine Coolant Thermostat 8 Cyl 7.4L ACDelco

P311-0438E89    W0133-1694589  New

Qty:
25.44
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
  • ; with RPO L29
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
1997 - Chevrolet P30 V 8 Cyl 7.4L 454 -
ACDelco
2002 GMC C3500HD Engine Coolant Thermostat 8 Cyl 8.1L ACDelco

P311-0438E89    W0133-1694589  New

Qty:
25.44
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
  • ; Incl.Gasket
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2002 - GMC C3500HD V 8 Cyl 8.1L 496 -
ACDelco
2001 Chevrolet Silverado 2500 HD Engine Coolant Thermostat 8 Cyl 6.0L ACDelco

P311-03992A8    W0133-1686955  New

Qty:
73.05
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
  • ; with Integrated Housing Design
  • Includes Coolant Outlet Housing and O-Ring. Used On Pumps with Casting # 12562459. If Water Pump Has Been Replaced By 2004 or Newer Pump, Must Also Use 2004 or Newer Inlet.
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2001 - Chevrolet Silverado 2500 HD V 8 Cyl 6.0L 364 5967
ACDelco
2005 Hummer H2 Engine Coolant Thermostat ACDelco

P311-03992A8    W0133-1686955  New

Qty:
73.05
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
  • ; with Housing and with Three Bolt Pattern
  • Includes Coolant Outlet Housing and O-Ring. Used On Pumps with Casting # 12562459. If Water Pump Has Been Replaced By 2004 or Newer Pump, Must Also Use 2004 or Newer Inlet.
Brand: ACDelco
Additional Fitment Information:
Vehicle
2005 - Hummer H2
ACDelco
2006 Saab 9-7x Engine Coolant Thermostat 8 Cyl 5.3L ACDelco

P311-03992A8    W0133-1686955  New

Qty:
73.05
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
  • ; Production: 01/01/2006-, with Integrated Housing Design
  • Includes Coolant Outlet Housing and O-Ring. Used On Pumps with Casting # 12562459. If Water Pump Has Been Replaced By 2004 or Newer Pump, Must Also Use 2004 or Newer Inlet.
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC Prod. Date Range
2006 - Saab 9-7x V 8 Cyl 5.3L 325 5328 Fr:01-01-06
ACDelco
2004 Cadillac CTS Engine Coolant Thermostat 8 Cyl 5.7L ACDelco - w/o O-Ring

P311-3D33C49    W0133-1783286  New

Qty:
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 Housing
  • w/o O-Ring
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2004 - Cadillac CTS V 8 Cyl 5.7L 346 -
ACDelco
2005 Pontiac GTO Engine Coolant Thermostat ACDelco - w/o O-Ring

P311-3D33C49    W0133-1783286  New

Qty:
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 Housing
  • w/o O-Ring
Brand: ACDelco
Additional Fitment Information:
Vehicle
2005 - Pontiac GTO
ACDelco
2002 GMC Sierra 1500 Engine Coolant Thermostat 8 Cyl 5.3L ACDelco - w/o O-Ring

P311-3D33C49    W0133-1783286  New

Qty:
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
  • ; Except Integrated Housing Design

    w/o Housing
  • w/o O-Ring
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2002 - GMC Sierra 1500 V 8 Cyl 5.3L 325 5328
ACDelco
2008 Buick LaCrosse Engine Coolant Thermostat 8 Cyl 5.3L ACDelco - w/o O-Ring

P311-3D33C49    W0133-1783286  New

Qty:
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 Block Engine CID CC
2008 - Buick LaCrosse V 8 Cyl 5.3L 325 5328
ACDelco
2007 GMC Sierra 1500 HD Classic Engine Coolant Thermostat ACDelco - w/o O-Ring

P311-3D33C49    W0133-1783286  New

Qty:
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 housing
  • w/o O-Ring
Brand: ACDelco
Additional Fitment Information:
Vehicle
2007 - GMC Sierra 1500 HD Classic
ACDelco
2004 Cadillac Escalade EXT Engine Coolant Thermostat ACDelco

P311-3787E2C    W0133-1783287  New

Qty:
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
  • ; with Housing
  • Includes Coolant Outlet Housing and Gasket
Brand: ACDelco
Additional Fitment Information:
Vehicle
2004 - Cadillac Escalade EXT
ACDelco
2002 Chevrolet Silverado 3500 Engine Coolant Thermostat 8 Cyl 6.0L ACDelco

P311-3787E2C    W0133-1783287  New

Qty:
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
2002 - Chevrolet Silverado 3500 V 8 Cyl 6.0L 364 5967
ACDelco
2001 GMC Sierra 3500 Engine Coolant Thermostat 8 Cyl 6.0L ACDelco

P311-3787E2C    W0133-1783287  New

Qty:
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
  • ; Except Integrated Housing Design

    with Housing
  • Includes Coolant Outlet Housing and Gasket
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2001 - GMC Sierra 3500 V 8 Cyl 6.0L 364 5967
ACDelco
2002 Chevrolet Corvette Engine Coolant Thermostat ACDelco

P311-3787E2C    W0133-1783287  New

Qty:
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
  • ; with Two Bolt Pattern
  • Includes Coolant Outlet Housing and Gasket
Brand: ACDelco
Additional Fitment Information:
Vehicle
2002 - Chevrolet Corvette
ACDelco
2006 Saab 9-7x Engine Coolant Thermostat 8 Cyl 5.3L ACDelco

P311-3787E2C    W0133-1783287  New

Qty:
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
  • ; Production: -12/31/2005
  • Includes Coolant Outlet Housing and Gasket
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC Prod. Date Range
2006 - Saab 9-7x V 8 Cyl 5.3L 325 5328 To:12-31-05
ACDelco
2006 Saab 9-7x Engine Coolant Thermostat 8 Cyl 5.3L ACDelco

P311-3787E2C    W0133-1783287  New

Qty:
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
  • ; Production: 01/01/2006-
  • Includes Coolant Outlet Housing and Gasket
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC Prod. Date Range
2006 - Saab 9-7x V 8 Cyl 5.3L 325 5328 Fr:01-01-06
ACDelco
1999 Cadillac Escalade Engine Coolant Thermostat ACDelco

P311-5123BC4    W0133-1972134  New

Qty:
37.31
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 O-Ring
Brand: ACDelco
Additional Fitment Information:
Vehicle
1999 - Cadillac Escalade
ACDelco
1999 GMC K2500 Engine Coolant Thermostat 8 Cyl 5.7L ACDelco

P311-5123BC4    W0133-1972134  New

Qty:
37.31
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
1999 - GMC K2500 V 8 Cyl 5.7L 350 -