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Thermostat Housing with Temperature Sensor 
200,Avenger,Sebring,Compass,Journey,Caliber,Patriot
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$
57.99
Dispatch within 1 business day
Coolant Thermostat Housing Water Outlet with Sensor
Cruze Limited,Trax,Encore,Cruze,Sonic
Check if this fits your vehicle
$
23.99
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Thermostat Housing Assembly
325xi,528i xDrive,530xi,128i,328i,535xi,328xi,330i,530i,528i,335is,Z4,X3,1 Series M,335xi,135i,535i xDrive,323i,335i,325i
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$
54.99
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Coolant Thermostat Assembly w/ Sensor
Cruze Limited,Trax,Encore,Cruze,Sonic
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$
27.99
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Thermostat Housing Assembly
Cover; Includes Thermostat
E280,S400,SLK350,E350,CLK350,SLK280,CLK280,C300,ML350,ML450,GLK350,C230,C350,SLK200,C250,SLK300,C280,R350,GLK280,S350
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$
59.99
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Thermostat Housing with Gasket Assembly
Cover; w/ Thermostat
200,Cherokee,Town & Country,Avenger,Grand Caravan,ProMaster 3500,Routan,C/V,Journey,ProMaster 2500,ProMaster 1500
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$
29.99
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Thermostat Housing Assembly
With thermostat
325xi,323i,325i,328i,330xi,525i,330i,530i,330Ci,528i,328Ci,Z3,325Ci,Z4,X3,323Ci,X5
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$
41.99
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Coolant Thermostat & Housing with Sensor
With Temperature Sensor; Thermostat Housing Assembly
Cruze Limited,Trax,Cruze,Sonic
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$
55.99
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Engine Coolant Thermostat Housing Assembly
w/Cover; Plastic Housing
Explorer Sport Trac,Mountaineer,Explorer
Check if this fits your vehicle
$
30.99
Dispatch within 1 business day
$
51.99
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Thermostat Housing Assembly
Cover, Includes Thermostat
Durango,Wrangler JK,Grand Cherokee,Wrangler
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$
30.99
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Engine Coolant Thermostat Housing Assy
S-Type,XJR,XK,XJ8,Super V8,Vanden Plas,XF,XKR
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$
85.99
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Engine Coolant Thermostat Housing Assembly
528i xDrive,320i xDrive,428i xDrive,228i,328i,328i GT xDrive,320i,428i xDrive Gran Coupe,428i Gran Coupe,228i xDrive,528i,428i,X1,Z4,X3,X4,X5,328i xDrive
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$
60.99
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Thermostat Housing Assembly
325xi,323i,325i,328is,328i,330xi,525i,330i,320i,530i,330Ci,528i,323is,328Ci,Z3,325Ci,Z4,X3,323Ci,X5
Check if this fits your vehicle
$
54.99
Dispatch within 1 business day
$
41.99
Dispatch within 1 business day
Engine Coolant Thermostat Housing Assembly
Escape,CX-7,MX-5 Miata,Ranger,Tribute,Mariner,Transit Connect,3,Milan,5,Focus,6,3 Sport,B2300,Fusion,MKZ
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$
23.99
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$
43.99
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Thermostat Housing Assembly
Golf R,Q3,Q5,Golf City,Q7,A6 Quattro,A5 Quattro,A3,A4,A5,A4 allroad,A6,Beetle,Tiguan Limited,CC,Golf,Jetta,Eos,Q3 Quattro,allroad
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$
35.99
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Engine Coolant Thermostat Housing Assembly
Cover; Includes Thermostat, Original Plastic Design
300,Challenger,Charger
Check if this fits your vehicle
$
23.99
Dispatch within 1 business day
$
24.99
Dispatch within 1 business day
What is an engine thermostat?
While all engines can become too hot, if your thermostat isn't working correctly, your engine's well-being is at serious risk. The engine thermostat, often simply referred to as a thermostat, regulates the engine's operating temperature within an optimal range (typically around 195 to 220 degrees Fahrenheit).
How does a car thermostat work?
As a temperature-sensitive valve within the cooling system, a car thermostat responds to changes in coolant temperature. Understanding how it works by the following breakdown steps:
- Closed position (cold start)
Initially closed to help the engine warm up quickly.
- Heating up
The engine generates heat during operation.
- Opening the thermostat
A temperature-sensitive element (usually wax) causes the thermostat to open gradually.
- Coolant flow
When open, coolant flows from the engine to the radiator.
- Maintaining optimal temperature
Adjusts coolant flow to maintain the ideal engine temperature.
- Temperature regulation
Continuously adjusts to prevent overheating and ensure efficient operation.
Signs of a bad thermostat
- Overheating: The engine becomes excessively hot due to a stuck-closed thermostat.
- Low or fluctuating temperature: A thermostat stuck open results in a cooler engine, affecting fuel efficiency and heating.
- Temperature warning light: Illuminates to indicate engine overheating due to a faulty thermostat.
- Poor fuel efficiency: Stuck-open thermostat reduces fuel efficiency as the engine operates less efficiently at lower temperatures.
- Inadequate cabin heating: Insufficient cabin heating in cold weather with a thermostat that's stuck open.
- Coolant leaks: Gasket or sealing issues can lead to coolant leaks.
- Rapid temperature fluctuations: The gauge shows rapid swings between hot and cold.
- Engine running hot at idle: Higher engine temperature during idle or in traffic due to restricted coolant flow.
- Slow or inconsistent warm-up: Longer-than-normal warm-up times, even in moderate weather.
- Inconsistent heater operation: This affects the performance of the vehicle's heater, causing inconsistent or inadequate heating in cold weather.