Question about 1997 Chevrolet Cavalier

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I think my thermostat is stuck closed how and where do i open it?

My engine overheats pretty fast when i drive and if i park and leave on, one time it got in red zone

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First I would check to see if your cooling fan is coming on.

Posted on Oct 08, 2009


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How to know if thermsat need change on Honda accord v6

1. If your coolant temperature is high your engine will overheat and you may have a faulty thermostat . However overheating may also be caused by other issues such as a failed water pump, blockages in the cooling system, a compression leak into the cooling system and other issues.

2. When the engine is fully cold open the hood and locate the top radiator hose running between the top of the radiator and the engine. Start the car and then feel the top hose. It should stay cool for a short time while the coolant gets to operating temperature and then the thermostat will open. When it opens the hot coolant from the engine will flow through the top hose into the radiator and you should feel the hose warm up very fast. This is an indication that the thermostat is operating normally but it is still possible that it is stuck partly open (when it should be fully open) and is impeding the flow of hot coolant from the engine. In that event it would need to be changed.

If you start the engine and you almost immediately feel hot coolant running through the top radiator hose the thermostat may not be closing at all and may be stuck fully open or partly open. It would then need to be changed. If stuck fully open the engine will run too cold some of the time and inefficiently, especially if the outside air temperature is very cold. But if a thermo is stuck fully closed or partially closed this will cause the engine to overheat and engine damage will result.

To properly test a thermostat it really needs to be removed from the engine. Please read the section in the link on Thermostats.

What to Do When Your Engine Overheats


Mar 26, 2016 | Honda Cars & Trucks

1 Answer

2010 kia soul if thermostat is not working what problems can it cause

Engine overheats if the thermostat is stuck in the closed position. Engine can be damaged permanently. Engine takes a long time to heat up if the thermostat is stuck in the open position. Defective thermostat in both situations.

Dec 16, 2013 | 2010 Kia Soul 2.0

1 Answer

Replaced thermostat and new coolant on 2004 suzuki forenza due to overheating problems doing driving on freeway or street as soon as i leave home. Problem stop one day then the next day i had some rough...

there are only 2 ways to overheat,
and vast causes !
1: engine making too much heat.
a: eg. cam/spark timiing way off. eg retarded timing does that.
2: Cooling system failure.

just 2. finding out which one takes tests.
I do my engine checks first.
A; compression. ok
b; timing right.
C: egr closing,
d: cat not melted closed down (huge backpressure, "guaged"

then when happy my engines happy,
I then attack the cooling system.
Thermostat new, and not put in wrong,
wax side to input side,RTM, bleed hole high (jiggle pin,etc)
I use an IR pyro gun $15 to check ALL rad tubes top and bottom
so see if one or more is clogged,, this is easy, ask.

does it over heat parked at a read light
does it never fail moving fast.
these are the top clues.
only fails A/C on?
fans all work, some have 3 on A/C cars up front.

the question is, , is the stalling caused by overheating or is only a victim. only you know that, as you are driving.
if you see bad running before the oveheat, then its just that.
is the car pinging?
engines that ping overheat and blow pistons.
engines that overheat can ping.
but in the latter, it overheats FIRST.

Aug 06, 2013 | 2004 Suzuki Forenza

1 Answer

How do I know if my thermostat is bad on my 1995 tahoe

About all a bad thermostat can do is get stuck open or get stuck closed. If stuck closed, engine will overheat-coolant can't circulate through the radiator.
If stuck open, will take a long, long time for engine to reach normal operating temperature-about 20-30 minutes driving or more.

Dec 10, 2012 | Chevrolet Tahoe Cars & Trucks

2 Answers

Ford repair

Causes can be:
Thermostat is defective and fails to open, but that is not common.
Radiator is clogged inside or a plastic bag has got sucked to the front or the fins are full of dirt. Low coolant level due to a leak. Defective water pump impeller due to corrosion. Defective cooling fan on engine.
You don't say how fast it overheats or under what conditions (idle, freeway etc.) so that kind of handicaps my diagnosis

Jan 19, 2012 | 2003 Ford Explorer

2 Answers

Car overheats while idleing in park or drive,1996 accord ex


Apr 12, 2011 | 1996 Honda Accord

1 Answer

Replacing a thermostat

Buick Park Avenue Thermostat Repair Recommendations Best Practices
  • The entire cooling system should be inspected and tested when the thermostat is replaced.
  • A high-quality OEM thermostat should be used. Poor quality thermostats may not function properly and can cause damage to the engine or components of the emission system.
Common Symptoms
  • A thermostat that is stuck closed will cause the vehicle to overheat.
  • If the new thermostat does not immediately resolve engine temperature problems, the cooling system needs to be checked for other issues.
  • A thermostat that is stuck open can cause the engine to run colder than normal and set the Check Engine Light. It may also cause poor fuel mileage and the heater to blow cool air.
The thermostat will be at the end of one of your radiator hoses that goes into the engine block; normally at the top of the engine.

Feb 04, 2011 | 1995 Buick Park Avenue

1 Answer

My 1998 legacy is overheating, check engine light doesn't come on, could it be the thermostat?

Yes it could, but the cars have a bad reputation for eating head gaskets, so just to be safe, keep your eye on the temp gauge, don't let it over heat, carry water with you. and check for steam out the exhaust when driving, look for oil in the radiator, it will float to the top. A radiator shop can tell you real fast if you have a blown head gasket. We just did one here, found it easier to replace the motor than to do the heads. I have heads if you need them, J25. But on the bright side, could just be low on water. Your thermostat will usually make the engine run cold from being stuck wide open, If it gets stuck in the closed position, it will overheat, pop open the rad cap when warmed up, careful, look to see if the water is moving. If it is, the thermostat is open, will not overheat.

Apr 07, 2010 | 1998 Subaru Legacy

1 Answer

Can a thremastat stuck open have low engine temp and bad gas milage

If the thermostat is stuck open it would eventually get hot after a while. It's like some people think you can remove the thermostat to keep the engine from getting hot so in theory it could for a little while, however it would eventually overheat. As for the gas mileage being bad yes if it was stuck open and was not warming up fast enough the computer would take longer to go into closed loop, meaning the engine temperature takes to long to heat up so it burns rich until it does warm up enough, however it would be a minor change of mileage say 2 to 3 miles to the gallon. Hope this helps.

Jan 24, 2010 | 1997 GMC Jimmy

1 Answer

2005 dodge caravan need to know symptoms for faulty thermostat

There are two primary symptoms of a faulty thermostat (assuming you mean the coolant thermostat in the engine not the A/C Heater Thermostat).  The thermostat can fail in basically two ways:
1)  Stuck open - Engine runs colder, heater takes forever to heat up. 2)  Stuck closed - Engine runs very hot, then will suddenly drop in temperature, then run very hot again.  Or engine overheats constantly.  When the engine is hot, feel the upper radiator hose.  If it is not hot, you can bet the thermostat is stuck closed.  If it is hot, the thermostat may not be stuck close, but not opening at the proper temperature.
Stuck open is annoying, but not dangerous.  Stuck close is dangerous and can cause overheating-related damage to your engine.
If you are handy, you can replace it yourself.  Otherwise it is an easy job for a mechanic.

Jan 24, 2009 | 2005 Dodge Caravan

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