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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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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, Evobus, Fiat, Ford, Foton, Freightliner, GMC, Genesis, Geo, Grande West, Honda, Hummer, Hyundai, INFINITI, Indiana Phoenix, 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, Stewart & Stevenson, Subaru, Sutphen Corp., Suzuki, Temsa Bus, Toyota, Triumph, VAM, Volkswagen, Volvo, Western RV, Western Star.


ACDelco
2003 Chevrolet Suburban 2500 Engine Coolant Thermostat 8 Cyl 8.1L ACDelco - 195F / 91C

P311-1A09B54    W0133-1682422  New

Qty:
In Stock & Ready to Ship
$44.77
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
2003 - Chevrolet Suburban 2500 V 8 Cyl 8.1L 496 -
ACDelco
2011 Saab 9-3 Engine Coolant Thermostat ACDelco

P311-1D50E6E    W0133-1866553  New

Qty:
In Stock & Ready to Ship
$181.58
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
2011 - Saab 9-3
ACDelco
2003 Buick Century Engine Coolant Thermostat ACDelco - 195F / 91C

P311-1A09B54    W0133-1682422  New

Qty:
In Stock & Ready to Ship
$44.77
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
2001 Chevrolet Suburban 2500 Engine Coolant Thermostat 8 Cyl 8.1L ACDelco - 195F / 91C

P311-1A09B54    W0133-1682422  New

Qty:
In Stock & Ready to Ship
$44.77
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
  • 195F / 91C
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2001 - Chevrolet Suburban 2500 V 8 Cyl 8.1L 496 -
ACDelco
1993 Chevrolet Beretta Engine Coolant Thermostat 4 Cyl 2.2L ACDelco - 195F / 91C

P311-1A09B54    W0133-1682422  New

Qty:
In Stock & Ready to Ship
$44.77
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
  • 195°F
  • 195F / 91C
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
1993 - Chevrolet Beretta L 4 Cyl 2.2L 134 2190
ACDelco
1992 Geo Metro Engine Coolant Thermostat ACDelco - 195F / 91C

P311-1A09B54    W0133-1682422  New

Qty:
In Stock & Ready to Ship
$44.77
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 195°F
  • 195F / 91C
Brand: ACDelco
Additional Fitment Information:
Vehicle Submodel
1992 - Geo Metro LSi
ACDelco
2009 GMC Sierra 3500 HD Engine Coolant Thermostat 8 Cyl 6.6L ACDelco

P311-5F4CEDF    W0133-1694073  New

Qty:
In Stock & Ready to Ship
$83.68
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
  • Front
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2009 - GMC Sierra 3500 HD V 8 Cyl 6.6L 403 6599
ACDelco
2009 Chevrolet Silverado 2500 HD Engine Coolant Thermostat 8 Cyl 6.6L ACDelco

P311-4BD529D    W0133-1694074  New

Qty:
In Stock & Ready to Ship
$73.15
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
  • Rear
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2009 - Chevrolet Silverado 2500 HD V 8 Cyl 6.6L 403 6599
ACDelco
1993 Geo Metro Engine Coolant Thermostat ACDelco - 195F / 91C

P311-1A09B54    W0133-1682422  New

Qty:
In Stock & Ready to Ship
$44.77
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 1st Design, with 195°F
  • 195F / 91C
Brand: ACDelco
Additional Fitment Information:
Vehicle Submodel
1993 - Geo Metro LSi
ACDelco
2017 Chevrolet Silverado 2500 HD Engine Coolant Thermostat 8 Cyl 6.6L ACDelco

P311-5F4CEDF    W0133-1694073  New

Qty:
In Stock & Ready to Ship
$83.68
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
  • Rear

    with 185°F
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2017 - Chevrolet Silverado 2500 HD V 8 Cyl 6.6L 403 6599
ACDelco
2018 Chevrolet Silverado 2500 HD Engine Coolant Thermostat 8 Cyl 6.6L ACDelco

P311-4BD529D    W0133-1694074  New

Qty:
In Stock & Ready to Ship
$73.15
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
  • Rear

    with 180°F
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2018 - Chevrolet Silverado 2500 HD V 8 Cyl 6.6L 403 6599
ACDelco
2000 GMC Savana 3500 Engine Coolant Thermostat 8 Cyl 7.4L ACDelco

P311-0438E89    W0133-1694589  New

Qty:
In Stock & Ready to Ship
$29.81
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:
In Stock & Ready to Ship
$29.81
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 Chevrolet Suburban 2500 Engine Coolant Thermostat 8 Cyl 6.0L ACDelco

P311-03992A8    W0133-1686955  New

Qty:
In Stock & Ready to Ship
$73.09
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
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2002 - Chevrolet Suburban 2500 V 8 Cyl 6.0L 364 5967
ACDelco
2002 Chevrolet Tahoe Engine Coolant Thermostat ACDelco

P311-03992A8    W0133-1686955  New

Qty:
In Stock & Ready to Ship
$73.09
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

    with Integrated Housing Design
Brand: ACDelco
Additional Fitment Information:
Vehicle
2002 - Chevrolet Tahoe
ACDelco
2001 Chevrolet Suburban 1500 Engine Coolant Thermostat ACDelco

P311-03992A8    W0133-1686955  New

Qty:
In Stock & Ready to Ship
$73.09
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 Three Bolt Housing
Brand: ACDelco
Additional Fitment Information:
Vehicle
2001 - Chevrolet Suburban 1500
ACDelco
2006 Hummer H2 Engine Coolant Thermostat ACDelco

P311-03992A8    W0133-1686955  New

Qty:
In Stock & Ready to Ship
$73.09
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
Brand: ACDelco
Additional Fitment Information:
Vehicle
2006 - Hummer H2
ACDelco
2005 Chevrolet Avalanche 2500 Engine Coolant Thermostat ACDelco

P311-0438E89    W0133-1694589  New

Qty:
In Stock & Ready to Ship
$29.81
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 - 195°F
Brand: ACDelco
Additional Fitment Information:
Vehicle
2005 - Chevrolet Avalanche 2500
ACDelco
2008 Chevrolet Express 2500 Engine Coolant Thermostat - Front 8 Cyl 6.6L ACDelco

P311-5F4CEDF    W0133-1694073  New

Qty:
In Stock & Ready to Ship
$83.68
ACDelco Engine Coolant Thermostat Front
  • 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 185°F
Brand: ACDelco
Position: Front
Additional Fitment Information:
Vehicle Position Block Engine CID CC
2008 - Chevrolet Express 2500 Front V 8 Cyl 6.6L 403 6599
ACDelco
2002 Chevrolet Silverado 2500 HD Engine Coolant Thermostat 8 Cyl 6.6L ACDelco

P311-5F4CEDF    W0133-1694073  New

Qty:
In Stock & Ready to Ship
$83.68
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 185° F
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2002 - Chevrolet Silverado 2500 HD V 8 Cyl 6.6L 403 6599