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If thermostat not working what happen to your engine

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If the thermostat is not closing the engine will not warm up. If the thermostat is not opening the engine will overheat.

Posted on Feb 09, 2014

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Posted on Jan 02, 2017

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1 Answer

Why the engine want run? thermostat


check the wiring and connections where you were working

Nov 08, 2016 | Toyota Cars & Trucks

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Engine fans constantly running thermostat o.k. friend somehow used piece of wire in fan connection,fan worked fine after. Does anyone know how this is done?


If you say that the thermostat is good then the engine is running so hot that the fan always has to be on. Do you have enough coolant in system? Is the thermostat opening up all the way to promote proper circulation? What happens if you put your heater on full blast?

Nov 24, 2015 | 2001 Toyota Camry LE

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Why is my engine temperature guage working and then not working ?


Perhaps the culprit is a faulty sending unit. Try having it replaced and see what happens. If you can do it yourself, so much the better... assuming that you know what you're doing.

Jul 10, 2014 | 2006 Chevrolet Malibu LT

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2003 grand marquis trouble code po 128. Heater works. 100 mile trips no problem. Temp gage below C. New sensor or new thermostat?


Well code 128 is for a thermostat problem in the fact the engine is not reaching normal temp. If you have heat the engine is warming up but still may not be getting to normal range. Normal is 190 - 210 degrees.
I would replace the thermostat first and see what happens.

Jan 24, 2014 | 2003 Mercury Grand Marquis

2 Answers

Engine over heats


Check for collapsed radiator hose first.

Do the cooling fans come on? If not, check fuse, relay and if still no function- fan thermostat switch.

If fans do come on, replace water pump.

Jan 24, 2012 | 2001 Plymouth Neon

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I have a 1997 cadillac deville and it keep over heating. i have changed the hose out twice and checked for leaks, plus i my fan is working fine...


Check the waterpump and thermostat. When the waterpump doesn't turn, engine heat is not transported to the radiator. When the thermostat doesn't open once warm the same happens - no engine cooling.

The radiator should be hot op top and cooler at the bottom. If it's cold allover then there's no cooling fluid transport

Jun 29, 2011 | 1997 Cadillac DeVille

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My temperature gauge is not working despite having having new one installed. Thermostat when connected fan doesnt work when engine heats but when you dosconnect thermostat fan works immediately engine turn...


faulty thermostat switch ,does happen even to the best of us ,buy a new one then find thats faulty as well just buy another as they are not expensive

Apr 25, 2011 | Fiat 500 Cars & Trucks

1 Answer

Heater quit


Thermostat regulates coolant temp so that the engine doesn't run too cool, It has no effect on the heater temp once the engine has reached operating temperature. Check that the hoses running from engine cooling system to the dashboard are not blocked, bent or broken. (Actually if broken, engine would lose all coolant fluid, and you would notice the mess). Check that the heater switch is doing its job, and actually activating the heater. All that said, If your car happens to have NO thermostat, engine will never reach a normal temp, and the heater will not work.

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4 Answers

Engine rapidly overheats,coolantvery near boils


Most likely the thermostat. The heater bypasses the thermostat. If the thermostat is blocked the only cooling is via the heater matrix. To check start the engine with the heater off and put your hand on the thermostat housing when the thermostat opens you should feel the housing get hot. If it doesn't the thermostat is faulty.

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