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10 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 ...
rpmerf's user avatar
  • 8,403
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 ...
SteveRacer's user avatar
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4 votes
Accepted

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 ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
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 ...
Fred Wilson's user avatar
  • 11.6k
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 ...
Zaid's user avatar
  • 39.2k
4 votes
Accepted

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 ...
Ben's user avatar
  • 10.7k
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 ...
I have no idea what I'm doing's user avatar
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 ...
FCP Euro's user avatar
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 ...
R.. GitHub STOP HELPING ICE's user avatar
4 votes
Accepted

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,...
Solar Mike's user avatar
  • 34.6k
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 ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
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 ...
Fred Wilson's user avatar
  • 11.6k
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 ...
zipzit's user avatar
  • 6,559
3 votes
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Should I use both gasket and silicone sealer or only one on thermostat?

Since the thermostat in your car has a regular gasket, you can use RTV or not, at your pleasure. If you've had seepage issues in the past, it's almost a given you'd use it. Even if you haven't, it's ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
3 votes
Accepted

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 ...
Martin's user avatar
  • 8,458
3 votes

Saturn ion 2007 Temperature gauge

You should scan the engine for codes. On a Saturn you can have a P0128 (low coolant temp) code for a while with no check engine light. When you get a P0128 code, the ECM will turn on the engine fans, ...
MTA's user avatar
  • 6,475
3 votes
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What would be the long-term result of driving without a thermostat?

Engines are designed to run within a specific temperature range. The components of the engine expand as the engine warms up. The designed clearances within the engine will be correct around the ...
HandyHowie's user avatar
  • 25.4k
2 votes

How can I test my thermostat?

Just ran into a variation of the stuck open failure. Thermostat opened and closed at the correct temperature (195 F) when tested in a pot of hot water. However, when installed, the thermostat would ...
99 Park Ave's user avatar
2 votes
Accepted

Could oily sludge in cooling system affect engine temprature?

Deposits(grease, rust or whatever) in your cooling system can restrict the waterflow, but that's not necessarily the (only) cause. These deposits also restrict the heat transfer from the iron block to ...
Bart's user avatar
  • 2,954
2 votes

Thermostat behavior and failure modes

I'm sure that the answer to this question is specific to the make and model, but if you're really curious you could easily set up an experiment to get an approximation to the correct answer. Really I ...
rviertel's user avatar
  • 1,169
2 votes

Is a "coolant housing Ieak" coming from the housing or thermostat?

There are a couple of things here. First, the small puddle under your car is more than likely just water coming off of the A/C condenser. I speculate this is what it is due to there not being any ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
2 votes
Accepted

Ran 2002 PT cruiser w/ out coolant/water, overheated but temp gauge showed normal.

Ok, no real way to tell what damage was done. Possibilities, anywhere from scored pistons and cylinder walls. Blown head gasket, cracked head/block. I would fill the system and bleed out the air and ...
cano's user avatar
  • 823
2 votes
Accepted

Can a water pump slowly fail?

When you replaced the thermostat, did you use a Subaru Thermostat? That's essential; the replacements available at car spares stores are NOT the same, and are often the cause of cooling system ...
PeteCon's user avatar
  • 8,712
2 votes

temperature gauge too low while the AC is on

Not knowing what kind of vehicle you have, I'd suggest your thermostat is at fault. If you put in a lower temp thermostat than stock or the thermostat is stuck open (even slightly), your radiator is ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
2 votes

Sign of blown head gasket

The coolant system of a typical internal combustion engine is designed to operate at greater than atmospheric pressure. In so doing, the temperature of the coolant can be raised above "normal" boiling ...
fred_dot_u's user avatar
  • 4,580
2 votes

Should I use both gasket and silicone sealer or only one on thermostat?

Cant do ye any harm to use a little on original gasket
Keith Raymond's user avatar
2 votes

2002 Honda Civic Overheating -

I just replaced a D17A1 in my '03 Civic which is the same engine in your car (1.7L, non-VTEC, SOHC). The main reason I changed it out was because it was continually overheating, but you may not need ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
2 votes
Accepted

Which AC temperature gets rid of the fog

Evaporation isn't directly correlated with temperature it's a combination of air temperature and air moisture content. In general, warmer air can hold more moisture, so assuming that air of a given ...
the_storyteller's user avatar
2 votes
Accepted

What component failure could cause this?

Electric thermometers are called thermocouples, the way they work is that they offer less resistance to electrical current as temperature goes up, i.e. as it gets hotter the voltage on the circuit ...
GdD's user avatar
  • 17k

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