Chevy S-10
Thermostats
Jeep CJ
Chevy Blazer S-10

Why does your truck seem like it is overheating after replacing the thermostat when it is not losing any coolant or boiling over?

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Wiki User
2006-02-26 06:37:13
2006-02-26 06:37:13

3 weeks ago you found the upper radiator hose almost completely squeezed in on itself so you replaced the thermostat and upper hose!Also, the cooling system has been flushed and refilled and the cap has been replaced! Could be a partially plugged radiator. Flushing will not always take care of this. I would check the thermostat in a pot of water and thermometer prior to install. I have installed faulty new thermostats. Fool me once shame on you, fool me twice shame on me. thermostat in upside down ? spring should be in the block dying fuel pump

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No thermostat, no coolant, no waterpump. Basically you have no coolant circulating.

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Replacing a bad water pump can help to stop a motor from overheating. Hopefully that was the cause of the overheating. If it does not stop the overheating, try replacing the thermostat. Make sure you have the proper mix of antifreeze and water, the radiator filled with it. Check the level of coolant FIRST. Next, the hoses, and third the thermostat. Then, disconnect a hose and see if, by starting the vehicle, if there's water pressure. If not, its water pump time!

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Yes it can. A faulty thermostat can cause overheating which will cause coolant to be pushed out of the system.

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Low coolant, bad coolant tank cap, stuck thermostat, or clogged coolant line.

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Low coolant? Thermostat not opening? Water pump not circulating coolant?

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Low coolant? Cooling fan not working? Thermostat not opening? Water pump not circulating coolant?

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coolant temperature switch turns on the fan, if the fan isn't running the car's overheating...it's a sensor mounted in the coolant line that detects coolant temp.

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what is the year make & modle of it??

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Disconnect the battery and drain the coolant.

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Very possibly. You can check a spark plug and see if they are wet or you can see if there is gasoline in the coolant liquid.

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If it's overheating, it cold be thermostat, radiator or possibly other problems. If it's not overheating it could be the coolant level sensor.

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2 things I can think of which need to be checked: your coolant and your thermostat.

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Low coolant? Radiator probably needs flushing and/or replacing after 40 years. Bad thermostat? System airbound? Water pump not circulating coolant? Hoses collapsing? Bad radiator cap?

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If the car is overheating or if the temperature gauge is not coming up to normal operating temperature which is normally half way up the gauge then the thermostat needs replacing. As the water pump should be replaced at the same time as the cam belt every 90,000 miles, you should also replace the thermostat and coolant.If the car is overheating or if the temperature gauge is not coming up to normal operating temperature which is normally half way up the gauge then the thermostat needs replacing. As the water pump should be replaced at the same time as the cam belt every 90,000 miles, you should also replace the thermostat and coolant.

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You need to first drain the coolant, to lessen the mess of spilt coolant. Next you have to unbolt the coolant neck at the block to access the thermostat. After replacing, you have to refill/bleed the coolant system.

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Could be from a variety of things. Commonly overheating occurs when the car is low on coolant, broke thermostat or the radiator needs repairs.

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Thermostat, water pump, radiator cap, headgasket, low coolant.

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1) Your engine is overheating and the coolant is boiling. Or 2) Exhaust is leaking into the coolant, probably through a bad head gasket or cracked head.

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A thermostat that is stuck in the closed position is a very common cause of overheating. A new thermostat should be installed every time the coolant is changed.

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If the temp gauge reads normal and the engine is not overheating, the thermostat is doing its job. The thermostat maintains the coolant temp by opening and closing allowing the coolant to flow or not to flow. When it is closed the coolant doesn't circulate.

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If the engine is overheating, the thermostat is stuck closed. If the heater is not putting out enough hot air the thermostat is stuck open. Change the thermostat as a normal part of maintenance when changing coolant.

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Thermostat not opening correctly, low coolant level, poor coolant flow (i.e. clogged radiator), head gasket, radiator cooling fan not operating correctly, if it is boiling over,posible weak radiator cap.

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your temp guage will sky rocket if its bad, you may even have coolant a coolant leak (comming out of the the housing of the thermostat). replacing it is easy and cheap.


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