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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, 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 Star.


ACDelco
2004 Chevrolet Express 2500 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 Housing
  • w/o O-Ring
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2004 - Chevrolet Express 2500 V 8 Cyl 5.3L 325 5328
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
2003 GMC Yukon 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
  • ; Except Integrated Housing Design

    w/o Housing
  • w/o O-Ring
Brand: ACDelco
Additional Fitment Information:
Vehicle
2003 - GMC Yukon
ACDelco
2005 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 O-Ring
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2005 - Cadillac CTS V 8 Cyl 5.7L 346 -
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
2006 Chevrolet Trailblazer 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
  • ; with Housing
  • Includes Coolant Outlet Housing and Gasket
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2006 - Chevrolet Trailblazer V 8 Cyl 5.3L 325 5328
ACDelco
2001 Chevrolet Suburban 1500 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
  • Includes Coolant Outlet Housing and Gasket
Brand: ACDelco
Additional Fitment Information:
Vehicle
2001 - Chevrolet Suburban 1500
ACDelco
2004 GMC Envoy XL 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
  • ; Except Integrated Housing Design

    with Housing
  • Includes Coolant Outlet Housing and Gasket
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2004 - GMC Envoy XL V 8 Cyl 5.3L 325 5328
ACDelco
1998 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
1998 - Chevrolet Corvette
ACDelco
2006 Hummer H2 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 and with Two Bolt Pattern
  • Includes Coolant Outlet Housing and Gasket
Brand: ACDelco
Additional Fitment Information:
Vehicle
2006 - Hummer H2
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
1996 Chevrolet Blazer 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
Brand: ACDelco
Additional Fitment Information:
Vehicle
1996 - Chevrolet Blazer
ACDelco
2006 Hummer H3 Engine Coolant Thermostat ACDelco

P311-1A388FE    W0133-1972338  New

Qty:
79.65
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
2006 - Hummer H3
ACDelco
2009 Hummer H3T Engine Coolant Thermostat 5 Cyl 3.7L ACDelco

P311-1A388FE    W0133-1972338  New

Qty:
79.65
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 - Hummer H3T L 5 Cyl 3.7L 223 3654
ACDelco
2014 Chevrolet Impala Engine Coolant Thermostat 4 Cyl 2.4L ACDelco

P311-1D50E6E    W0133-1866553  New

Qty:
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 Block Engine CID CC
2014 - Chevrolet Impala L 4 Cyl 2.4L 145 2384
ACDelco
2006 GMC Savana 2500 Engine Coolant Thermostat 8 Cyl 6.6L ACDelco

P311-5F4CEDF    W0133-1694073  New

Qty:
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
2006 - GMC Savana 2500 V 8 Cyl 6.6L 403 6599
ACDelco
2012 Chevrolet Silverado 3500 HD Engine Coolant Thermostat 8 Cyl 6.6L ACDelco

P311-5F4CEDF    W0133-1694073  New

Qty:
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
  • ; with 185°F
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2012 - Chevrolet Silverado 3500 HD V 8 Cyl 6.6L 403 6599
ACDelco
2018 GMC Sierra 3500 HD Engine Coolant Thermostat 8 Cyl 6.6L ACDelco

P311-5F4CEDF    W0133-1694073  New

Qty:
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
  • ; Optional, 185 Degrees F, Incl.Gasket
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2018 - GMC Sierra 3500 HD V 8 Cyl 6.6L 403 6599
ACDelco
2011 Chevrolet Express 3500 Engine Coolant Thermostat 8 Cyl 6.6L ACDelco

P311-5F4CEDF    W0133-1694073  New

Qty:
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
  • ; with 185°F and with Gasket
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
2011 - Chevrolet Express 3500 V 8 Cyl 6.6L 403 6599