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      Thermostats
      Home / Thermostats

      Replacement Thermostats

      What does a Thermostat do?

      The primary function of your engine's thermostat is to maintain a minimum operating temperature in your vehicle's engine. When you start your engine cold, the antifreeze coolant mixture is kept within the engine by the thermostat. When the coolant temperature reaches the specified opening point of the thermostat, it opens. The lower temperature coolant will then flow through the radiator to keep the engine at a temperature close to the rated temperature of the thermostat. Most of today's trucks are designed to operate at a particular operating temperature which is controlled by your thermostat.

      What happens if you do not install the correct thermostat?

      If a lower temperature thermostat has been installed, it will affect several systems in your vehicle. A vehicle with computer-controlled fuel injection will sense the lower temperature and compensate by making the engine run richer, causing excessive fuel consumption and possibly a high idle. A lower temperature thermostat will also decrease the amount of heat available to keep you warm and defrost your windshield.

      What happens if the thermostat is not functioning properly?

      If your thermostat is stuck partially open or completely open, you will have the same symptoms as an incorrect thermostat. However, a thermostat that is stuck only slightly open will cause double trouble. An open thermostat will cause the unrestricted flow of your engine's coolant to occur.

      If the thermostat is stuck in the open position the following conditions will be present:

      • Your engine temperature will read lower than the normal range.
      • Your engine is not providing the same level of fuel economy.
      • Your vehicle's heating system does not produce heat.
      • The automatic transmission is sluggish when has shifting into higher gears
      • A thermostat that is stuck open will delays engine warm-up.
      • It may also not allow enough coolant to flow at high speed to keep the motor cool.
      • An open thermostat may also cause an overheating condition.

      These are all byproducts of an engine that is running too cool. It results in all sorts of inefficiencies within your vehicle. While this situation may not be life-threatening to your car, your comfort and fuel bills will suffer until you get it fixed.

      If the thermostat fails, your car may overheat. If you run without a thermostat, the computer will always execute the motor to run in enrichment or warm-up mode, meaning your fuel economy will decline, and your engine will produce less power.

      If the thermostat is stuck in the closed position the following conditions will be present:

      • The flow of coolant used to remove heat from the engine is blocked and the movement of the coolant cannot reach your radiator.
      • The coolant temperature gauge goes it into the red
      • The temperature warning light comes on
      • Steam or smoke comes from under the hood
      • Your engine overheats.
      • Your head gasket fails.
      • Severe internal engine damage occurs.

      Thermostat Replacement

      A thermostat can last many years, but it might be a good idea to have it replaced the next time your cooling system is serviced as a preventive maintenance procedure. Replacing the thermostat is a relatively straightforward and inexpensive repair. To do proper preventative maintenance, most manufacturers recommend a cooling system flush and refill every few years. Please check your service manual for the proper cooling system intervals and service requirements for your vehicle.

      Is your engine is starting to run hotter than normal?  Over time the thermostat's spring will start to fatigue and not properly function at the correct operating temperatures. These are direct replacement thermostats that will simply bolt right in place for a quick fix.

      Vendor

      Make

      Model

      Year

      OEM Cummins 190 Degree Thermostat for the 2007.5 to 2022 Dodge Ram 6.7L Cummins
      Cummins 5292712 190 Degree Thermostat Dodge Ram 6.7 Cummins
      $54.92
      200 Degree Cummins Thermostat For the 2010 to 2012 Dodge Ram 6.7L Cummins
      Sale
      Cummins 5292724 200 Degree Thermostat Dodge Ram 6.7L Cummins
      $76.15 $90.70
      Cummins 5292744 190 Degree Thermostat Dodge Ram Cummins
      Cummins 5292744 190 Degree Thermostat Dodge Ram Cummins
      $59.10
      CUMMINS 5292742 180 Degree Thermostat For 1998.5 to 2007 Dodge Ram 5.9L Cummins
      Sale
      Cummins 5292742 180 Degree Thermostat
      $53.22 $68.95
      Cummins 3934373 180 Degree Thermostat Kit
      Cummins 3934373 180 Degree Thermostat Kit
      $80.90
      Cummins 3928499 180 Degree Thermostat 94 to 98 Dodge 5.9L Cummins
      Cummins 3928499 180 Degree Thermostat 94 to 98 Dodge 5.9L Cummins
      $70.95
      Cummins 3946849 190 Degree Thermostat Dodge Ram Cummins
      Cummins 3946849 190 Degree Thermostat Dodge Ram Cummins
      $56.20
      Cummins 5292738 180 Degree Thermostat 1989 to 1993 5.9L Cummins
      Cummins 5292738 180 Degree Thermostat
      $59.85
      OEM Cummins 190 Degree Thermostat for the 2007.5 to 2019 Dodge Ram 6.7L Cummins
      Mopar 68005464AB 190 Degree Thermostat Dodge Ram 6.7 Cummins
      $182.52
      Example photo of thermostat
      Sale
      Cummins 3690535 190 Degree Replacement Thermostat for the QSL engine
      $87.20 $99.00
      Cummins 5292726 185 Degree Replacement Thermostat
      Sale
      Cummins 5292726 185 Degree Replacement Thermostat for the ISM11/ISX15/QSK/QST/QSX engine
      $58.74 $68.00
      Example photo of thermostat
      Sale
      Cummins 4318946 160 Degree Replacement Thermostat for the ISX/QSX engines
      $127.60 $205.99
      Cummins 3923331 180 Degree Thermostat Housing Cover Gasket
      Cummins 3923331 180 Degree Thermostat Housing Cover Gasket
      $9.72
      Cummins 5292708 180 Degree Thermostat Kit
      Sale
      Cummins 5292708 180 Degree Thermostat Kit
      $38.89 $40.34
      Mopar 180 Degree Thermostat Kit For the 1994 to 1998 Dodge Ram 5.9L Cummins
      Mopar 180 Degree Thermostat 94 to 98 Dodge 5.9L Cummins
      $87.45
      Example photo of thermostat
      Cummins 5337966 180 Degree Replacement Thermostat for the ISB 5.9L 98.5-02 24V
      $28.30
      Example photo of thermostat
      Sale
      Cummins 5284903 ISC/ISL/QSL 180 Degree Replacement Thermostat
      $79.98 $98.00
      Example photo of thermostat
      Sale
      Cummins 5273380 Replacement Thermostat for the K/NT 855/ISC engines
      $53.52 $71.00
      Example photo of thermostat
      Sale
      Cummins 4930315 Replacement Thermostat for the ISB/QSB engines
      $57.34 $62.00
      Example photo of thermostat
      Sale
      Cummins 4318947 180 Degree Replacement Thermostat for the ISX/QSX engines
      $67.00 $93.99
      Example photo of thermostat
      Cummins 4336659 Replacement 180 Degree Thermostat for the ISX/QSX engines.
      $70.62
      Example photo of thermostat
      Sale
      Cummins 4058195 Replacement Thermostat for the ISB/ISC/ISD/ISF/ISG/QSB engines
      $83.20 $103.49
      Example photo of thermostat
      Sale
      Cummins 4080631 Replacement Thermostat for the ISC/QSB engines
      $48.80 $60.28
      Example photo of thermostat
      Sale
      Cummins 4309185 Replacement Thermostat for the QSB 3.3L engines
      $79.70 $139.90
      Example photo of thermostat
      Sale
      Cummins 3931374 Replacement Thermostat for the SB/ISC/QSB engines.
      $48.16 $63.00
      Example photo of thermostat
      Cummins 3928639 Replacement 180 Degree Thermostat for the ISC engines
      $48.09
      Example photo of thermostat
      Cummins 3913028 180 Degree Replacement Thermostat for the ISC engines
      $60.50
      Example photo of thermostat
      Cummins 5337967 Replacement Thermostat for the ISF Engine
      $21.24
      Example photo of thermostat
      Sale
      Cummins 3802968 Replacement 180 Degree Thermostat for the B3.9L/B5.9L engines
      Sold Out
      Example photo of thermostat
      Cummins 5337942 Replacement 82 Degree Thermostat for the ISC engine
      $79.44
      Example photo of thermostat
      Sale
      Cummins 5292749 Replacement Thermostat for he ISB engine
      $26.16 $27.50
      Example photo of thermostat
      Sale
      Cummins 5292748 160 Degree Replacement Thermostat for the ISB engine
      $50.62 $65.00
      Example photo of thermostat
      Sale
      Cummins 5292740 Replacement Thermostat for the ISB/QSB engine
      $52.50 $69.90
      Cummins 5383379 180 Degree Replacement Thermostat
      Sale
      Cummins 5273379 180 Degree Replacement Thermostat
      $53.52 $71.00
      Example photo of thermostat
      Sale
      Cummins 4952631 Replacement Oil Cooler Thermostat for the ISN14/855 engines
      $98.62 $142.00
      Example photo of thermostat
      Sale
      Cummins 3064454 173 Degree Replacement Thermostat for the Big Bear 88NT engine
      $104.00 $158.00
      Example photo of thermostat
      Sale
      Cummins 4318948 Replacement 190 Degree Thermostat for the ISM/ISN/ISX/QSX engines.
      $133.10 $154.50
      Example photo of thermostat
      Sale
      Cummins 145976 K Series 180 Degree Replacement Thermostat
      $498.98 $565.00
      Example photo of thermostat
      Sale
      Cummins 3864178 Replacement Thermostat for the ISB engines
      $53.40 $65.00
      Example photo of thermostat
      Cummins 3928640 160 Degree Replacement Thermostat for the ISB/ISC/ISG/ISL/QSB engines
      $53.30
      Example photo of thermostat
      Sale
      Cummins 3696215 Replacement Thermostat for the ISG/ISGe engines
      $14.96 $17.00
      Example photo of thermostat
      Sale
      Cummins 3696214 Replacement Thermostat for the ISG/ISGe engines
      $23.96 $26.00
      Example photo of thermostat
      Sale
      Cummins 3800884 Thermostat for B/QSB 3.3L engines
      $60.40 $98.00
      Example photo of thermostat
      Sale
      Cummins 3411859 Replacement Thermostat for the B/K/QSM/NT engines
      $29.10 $32.00
      Generic Thermostat Picture
      Sale
      Cummins 3064455 187 Degree Thermostat for Cummins NH and NT855 Engine
      $124.50 $139.50
      Generic Thermostat Picture
      Sale
      Cummins 3064453 173 Degree Thermostat for Cummins NH and NT855 Engine
      $121.01 $136.50
      Generic Thermostat Picture
      Sale
      Cummins 3061649 180 Degree Thermostat for Cummins NH and NT855 Engine
      $145.10 $168.50
      Generic Thermostat Picture
      Sale
      Cummins 3049000 160 Degree Thermostat for Cummins NH and NT855 Engine
      $143.98 $158.50
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