Mechanical Car Thermostats

It’s simple: a mechanical car thermostat opens when your engine gets too hot, letting coolant flow, and then it closes when the temperature is just right. Summit...

It’s simple: a mechanical car thermostat opens when your engine gets too hot, letting coolant flow, and then it closes when the temperature is just right. Summit Racing Equipment is your ultimate source for mechanical thermostats, with applications for every engine size and opening temperature you would ever need!

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When the heat is on, equip your car or truck with a high-quality thermostat. Shop for stock car thermostat replacements and high-performance upgrades from manufacturers like Meziere, Stant, Vintage Air, ACDelco, Dorman, FlowKooler, JET Performance, Motorcraft, and many more.

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Showing In Stock Items. Show All 17 Items.

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Results 1 - 17 of 17

Sierra Marine Thermostats 18-3551

Thermostat, 142 Degree, 2.125 in. O.D., 1.5 in. Height, Mercruiser, Mercury Marine, Chrysler, Each

Part Number: RRA-18-3551

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Quicksilver Thermostats, Mechanical 807252Q5

Thermostat for 1987-2016 MerCruiser V6 and V8 engines with standard cooling requiring a 160°F thermostat.

Part Number: QSV-807252Q5

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Quicksilver Thermostats, Mechanical 8M0089715

Thermostat for various MerCruiser sterndrive applications with standard cooling systems. It is a 140°F thermostat.

Part Number: QSV-8M0089715

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Sierra Marine Thermostats 18-3550

Thermostat, 140 Degree, Mercruiser, Mercury Marine, Chrysler, Each

Part Number: RRA-18-3550

Not Yet Reviewed

Estimated Ship Date: Oct 2, 2025 if ordered today

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Estimated Ship Date: Oct 2, 2025 if ordered today

Sierra Marine Thermostats 18-3552

Thermostat, 160 Degree, Mercruiser, Mercury Marine, Crusader, Each

Part Number: RRA-18-3552

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Oct 3, 2025 if ordered today

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Estimated Ship Date: Oct 3, 2025 if ordered today

Quicksilver Thermostat Kits 807252Q3

Thermostat Kit for 1982 & older MerCruiser V8 engines with standard cooling systems and 1996 and older high performance MerCruiser engines

Part Number: QSV-807252Q3

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Sierra Marine Thermostats 18-3555

Thermostats, Mechanical, 160 Degrees F Opening Temperature, GLM/Mallory/Mercruiser Replacement, Each

Part Number: RRA-18-3555

Not Yet Reviewed

Estimated Ship Date: Oct 3, 2025 if ordered today

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Estimated Ship Date: Oct 3, 2025 if ordered today

Quicksilver Thermostats, Mechanical 8M0045990

Thermostat for MerCruiser sterndrive 8.2L Magnum and 8.2L EC MerCruiser inboard engines It is a 170°F thermostat.

Part Number: QSV-8M0045990

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Quicksilver Thermostats, Mechanical 8M0109441

Thermostat for MerCruiser engines with standard cooling systems requiring the use of the 160°F thermostat.

Part Number: QSV-8M0109441

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Quicksilver Thermostats, Mechanical 864493

Thermostat for MerCruiser engines 4.3L, 4.5L, 5.0L, 5.7L and 6.2L MPI Multi-Port Injection with dry joint exhaust and closed cooling systems

Part Number: QSV-864493

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Quicksilver Thermostats, Mechanical 8M0076464

Thermostat for the MerCruiser 496 sterndrive and 8.1L inboard engines. It is a 160°F thermostat.

Part Number: QSV-8M0076464

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Quicksilver Thermostats, Mechanical 807252Q4

Thermostat fits 1983-2016 MerCruiser V-6 and V-8 engines with standard cooling requiring a 140-degree thermostat (except high perf engines).

Part Number: QSV-807252Q4

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Quicksilver Thermostats, Mechanical 991551

Thermostat for 1998 and newer MerCruiser V6 and V8 engines with closed cooling systems and requiring the use of the 160°F thermostat.

Part Number: QSV-991551

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Quicksilver Thermostats, Mechanical 99155T1

Thermostat for 1998 and newer MerCruiser V6 and V8 engines with closed cooling systems and requiring the use of the 160°F thermostat.

Part Number: QSV-99155T1

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Sierra Marine Thermostats 18-3535

Thermostat, 130 Degrees Opening Temperature, Plastic/Steel, Mercury Marine, Each

Part Number: RRA-18-3535

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Quicksilver Thermostat Kits 59078Q3

Quicksilver Thermostat Marine Replacement 59078Q3

Part Number: QSV-59078Q3

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Quicksilver Thermostats 59078

Quicksilver Thermostat Marine Replacement 59078

Part Number: QSV-59078

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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