10 votes

How can I test my thermostat?

Failure Modes Mechanical thermostats fail in one of two ways: Stuck-closed The pintle/spring doesn't retract to permit flow at the set-point temperature that is usually stamped on the thermostat ...
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  • 39k
9 votes

Should you change a thermostat when changing your water pump

You don't need to, but since your coolant system is already drained, it would be a good time to. Standard thermostats are only about $10 and a $2 gasket. Changing your thermostat is typically 2 ...
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  • 8,403
7 votes
Accepted

How does the thermostat work?

Basically, the thermostat regulates the temperature of water/coolant in an engine. When you first start the car it should be closed, essentially blocking the water/coolant from traversing the radiator ...
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  • 366
7 votes

How does the thermostat work?

I had no idea it would be called this, but the article in Wikipedia describes the "low level" detail of how the device works. Wax thermostatic element Basic operation There is an optimum ...
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  • 13.2k
7 votes

Why don't thermostats have a sensor?

It might seem easy to integrate a sensor that detects the opening/closing of a mechanical thermostat's pintle (LVDT, for example) but here are some challenges which would need to be addressed: Cost ...
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  • 39k
7 votes

How to know when thermostat is open?

You will know the thermostat is open when the engine reaches operating temperature. The thermostat opens just before or around the operating temp of the engine. Most modern vehicles have some sort of ...
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7 votes

what in the thermostat opens when it reaches a certain temperature?

The spring remains largely the same. There is a capsule of thermoreactive "wax" which heats up and expands, acting against the "closed" spring pressure, and causing the "valve" section to lift ...
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  • 12.2k
5 votes

Rhythmic clunking sound somehow connected to the thermostat I just had replaced

Seeing as how changing your thermostat is a variable in this. This sounds more like an HVAC or blower motor issue. If the thermostat fixed it and you now have issues again during winter along with ...
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  • 3,323
5 votes
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Changed thermostat but now constant leak around thermostat housing

Found out this actually requires another O-ring, not a gasket. Another O-ring came with new the thermostat and I was able to use that.
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  • 3,572
4 votes

Car won't reach operating temperature

The thermostat would have been my first guess too. It doesn't need a sealing ring, the housing will slightly clamp it when you put it back together. It is entirely possible that the temperature ...
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  • 1,658
4 votes

How to change a thermostat on a 2007 Pontiac G6

No that's not the location. It's in the thermostat housing (attached to the engine) that the outlet radiator hose attaches too. This hose runs from the right side (passenger side) of the radiator to ...
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4 votes
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Vauxhall Corsa 1.3 CDTI Thermostat replacement?

I would suggest investing in a Haynes Manual for this car. One minor repair like this that you can do yourself will pay for it in savings. This is the part you are looking for, it's the thermostat ...
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4 votes
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Effects of anti-freeze concentration on engine temperature

Orthodox antifreeze is based on ethelyne Glycol. It does depress the freezing point and raise the boiling point of the cooling system. This is desirable and the suggested concentration is roughly ...
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  • 2,051
4 votes
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Does overheating that goes away under high RPMs indicate a sticky thermostat?

It very well could be the thermostat. However, did you check the obvious things, like coolant levels and make sure you don't have any air pockets? I had an overheating issue that would manifest after ...
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4 votes

Thermocouple vs Thermostat

A thermocouple merely generates voltage according to the temperature, while an automotive thermostat is basically an autonomous temperature sensitive coolant valve. You can't replace a thermostat with ...
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4 votes
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Suzuki Swift running cold - replaced thermostat and the issue persists

The heater core may be plugged, if fluid is full and there aren't any leaks. Check this when the engine is hot, if one hose is cold or warm and the other is hot the heater core is plugged. The temp ...
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  • 10.7k
4 votes

Should you change a thermostat when changing your water pump

I see no reason to do them together unless you have reason to believe the thermostat needs to be replaced, or unless you have an unusual vehicle in which the thermostat is hard to access without ...
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4 votes

How do I choose the correct thermostat?

Go to a site for parts diagrams with a VIN/chassis number lookup like http://www.realoem.me. Give it a try, I think it will be quite helpful. Using that site based on an ASV engine I believe you need ...
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4 votes

Thermostat behavior and failure modes

Are there failure modes besides "stuck open" and "stuck closed?" Absolutely. This has been the bane of many an E39 M5 owner. If the coolant is able to navigate through an alternative flow path ...
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  • 39k
4 votes
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How to diagnose a P0125 on a 2001 Lincoln Navigator

Code P0125: Insufficient coolant temperature for closed loop operation. The code sets under these conditions: Engine run-time at road load over 6 minutes at which time the PCM detected the Engine ...
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  • 11.5k
4 votes
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What actually happens when there is no Thermostat ( bypass thermostat)in coolant system?

The engine, if the rest of the cooling system is in good order, will run too cold. This will affect fuel consumption, emissions and perhaps power delivery. While this is often done for short periods,...
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  • 34.4k
4 votes
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How can I open my thermostat cover which is stuck due to using too much gasket maker material?

Using a putty knife, drive it down between the housing and cover (as you put it), tapping it gently with a hammer. This will separate the two halves and give you a "way in" between. After ...
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3 votes

Does overheating that goes away under high RPMs indicate a sticky thermostat?

It sounds like the issue is with heat rejection. The tell-tale sign is that the coolant temps rise into the red when the car is at idle (low RPM, little air flow across the radiator), but when the ...
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  • 39k
3 votes

Cooling system flush procedure questions

Is it necessary to remove the thermostat since it's going to open when engine reaches temperature? No, it is not necessary to remove the thermostat. In fact, some cars you don't want to remove the ...
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3 votes
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how to temporarily fix a gasket leak?

There is no way to put sealant around the outside of the housing to get it to stop leaking. You could possibly put a sealant within the coolant system, such as Bar's Radiator Stop Leak, which may or ...
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3 votes

No Heat No Clue

The thermostat is a valve that helps your engine cool correctly. When the engine is cold, all engine coolant flows within the engine block; the thermostat is closed in that condition. As the engine ...
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  • 6,479
3 votes
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Why can't I get my thermostat housing to seal?

The rubber seal around the outer edge of the thermostat should provide the seal without the use of RTV. 3+mm would be enough to cause a leaking issue, no doubt. As for the RTV which you now have on ...
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3 votes

Thermostat or temperature sensor (2011 Town & Country)

The most likely cause is the thermostat. The on the road temp is the clue, it should be at the thermostat open temperature which is specified to be 180 deg F. This is the lowest temperature that ...
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  • 11.5k
3 votes
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Torque specs for a plastic thermostat flange

You have three possibilities: You somehow get the official workshop manual (I have no idea how) and use the official torque (If given) You ask around until you get the "internet quote" of ...
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  • 7,828
2 votes
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Thermostat Problem?

I think you are on the right track with the thermostat. No it should only take a few minutes max, even in colder temperatures for it to warm up. The thermostat is a cheap part to change and usually ...
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