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Thermostat not opening and the car is running hot

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Thermostat go to bad and will need replaced. Dont do it could overheating and serious damage.

Posted on Feb 16, 2012

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Posted on Jan 02, 2017

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3 Answers

Started running hot,replaced thermostat and still runs hot.Top radiator hose is hot bottom is cold.


Did you put the thermostat in backwards? If you did, it wont open when hot. Thermostats look pretty much the same - with some minor variations. It's important to note the the side with the spring should be facing the (hot) engine and the other side facing the (cool) radiator as shown in the image below. If the spring side doesn't get hot - it won't open to let hot water from the engine flow to the radiator for proper cooling.



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Aug 10, 2015 | Cars & Trucks

1 Answer

Should 2.7 overheat with rad cap off??


it can run hot with cap off due to the pressure needed to open the thermostat, but it would take about 20-30 minutes for it to run hot. if engine is running hot really fast, check for stuck thermostat or blown headgasket. also check the cooling fans operation.

Jun 20, 2012 | 2000 Dodge Intrepid

1 Answer

Temp gt hot blowing cold air would this be a thermostat or water pump


Maybe a thermostat..or the heatercore clogged up..If the vehicle runs hot pretty quick then its the thermostat stuck closed..If the vehicle is not running hot,but you have no heat then the thermostat will be stuck open or the heater core not circulating

Sep 04, 2011 | 2000 Buick Century

1 Answer

I have a 92 Acura Legend L V6 engine. My acura had been running hot until I put a brand new radiator on it, I drove the car for appro 40 miles one way and back, still didn't run hot. The car heater...


Thermostat improperly installed. (backwards) Or possibly you could have a blown head gasket and a bad thermostat at the same time. The head gasket could be letting exhaust gasses into the cooling system. A bad (stuck open) thermostat could "mask" this problem by allowing the coolant to circulate through the radiator when it is not supposed to. Thus, installing a new thermostat would trap the exhaust gasses in the cylinder head and cause the overheating.

Feb 05, 2011 | Acura Legend Cars & Trucks

2 Answers

Antifreeze light says system is low and car runs hot but antifreeze level is where it should be


Sounds like it could be a thermostat not opening. If the thermostat doesn't open then it will get hot because its not allowing the cooled antifreeze from the radiator into the engine. Your car has two circulations with the antifreeze. While your car is running it is heating up the antifreeze in the engine and when it reaches a certain temperature the thermostat opens and takes the hot antifreeze from the engine and puts it into the radiator to be cooled. At the same time the cool antifreeze from the radiator is placed into the engine to keep it cool. If your thermostat doesn't open your engine will get hot and overheat.

Feb 04, 2011 | 2000 Oldsmobile Intrigue

1 Answer

Have a 1993 toyota paseo it keeps running hot change out radiator and house it does not have a tremostate could that be making it run hot


An explanation of the cooling system.
You start your car, it is cold at first. The thermostat is shut. Car warms up and raises the temperature of the coolant in the engine block. Thermostat opens up. Water from the radiator (cool) is exchanged for water from the engine block (hot) The cool water causes the thermostat to shut. This traps the hot water in the radiator so that it can be cooled down. The cool water that was exchanged for the hot water, now becomes the hot water because it is in the engine block. It heats up until it's temperature causes the thermostat to open again, exchanging cool water for hot water. If you have no thermostat, then you will never hold water inside your radiator. You have to hold it there to allow it to cool off, then it becomes useful to cool your engine. So, yes put a thermostat back in it, and please vote as to whether this was helpful or not.

Nov 23, 2010 | 1993 Toyota Paseo

1 Answer

Engine temp reading 3/4,new water pump,new thermostat,clean oil and new filter,no sign of water in oil,no steam out rear pipe,engine runs poor once hot,water pipes not tight when hot.head gasket? what you...


Remove thermostat and run the vehicle. do your hoses get tight now? If so, your new thermostat was not opening up. test it by putting it into a pot of water and bring up the temp on your stovetop. if the water boils, and the thermostat isnt open, then get a refund and a new thermostat. Be sure to point the spring end of the thermostat into the engine block when replacing. If your thermostat did open, then your water pump may be shot.

Nov 22, 2010 | Suzuki Swift Cars & Trucks

1 Answer

What temperature should the thermostat run? Just added antifreeze and its running at about 220, that seems a little hot?


YOUR VECHICLE CALL FOR 195 DEGREE THERMOSTAT.THERMOSTAT SHOULD OPEN AT 188 TO 195 DEGREES.CHECK COOLANT FAN CLUTCH THE FAN SHOULD HAVE RESISTANCE WHEN TURN BY HAND WHEN HOT.IF NOT FAN FREE WHEELING ALL THE TIME THAT WOULD CAUSE ENGINE TO RUN HOT.

Jun 13, 2010 | 1994 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

2 Answers

Overheating


could be a leak or crack in a radiator hose
could be water pump not working good or leaking
could be radiator leaking
could be thermostat half blocked

Jul 17, 2008 | 2001 Audi A6

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