Question about 1990 Subaru Legacy

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90 legacy, thermostat keeps showing over heating but there is coolant in reservoir and the engine doesn't seem to be over heating.

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  • 231 Answers

Hi it could be a faulty water temp sensor, however if the car was overheating you would notice as it would be gurgling or steaming in the engine bay somewhere, it may also be a sick water pump or cracked radiator

Posted on Apr 08, 2011

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I have a 96 Jetta GL and I just replaced the thermostat in it because I have no hot air coming out of the vents and now my car is running hot. What is the problem and how could I fix it?


AS FAR AS THE OVERHEAT ISSUE BLEED THE AIR OUT OF THE COOLING SYSTEM. FOR THE NO HEAT CHECK OPERATION OF TEMP BLEND DOOR AND FOR CLOGGED HEATER CORE

Dec 18, 2014 | Cars & Trucks

1 Answer

Temp sensor silverado


Yes it would overheat without circulation, but the coolant doesn't circulate through the overflow tank. That reservoir only gets coolant into it when the coolant gets hot and expands and pushes the radiator cap seal up to let coolant into the reservoir. When the vehicle cools down, the coolant contracts and the lower level in the radiator will siphon the coolant out of the reservoir back into the radiator. Coolant circulation is from the engine to the radiator and back into the engine...and also through the heater core.
You may have an air block in the heater core. Check by taking off the outlet hose at the firewall or at the engine and see if you have a slow steady stream of coolant, with the engine running and heater controls on high heat. If it was an air block, a steady stream should quickly start. If you get little or no flow, the core may be plugged and need flushing backward or replaced.

Nov 14, 2012 | Cars & Trucks

2 Answers

1990 subaru legacy- overheats, I"ve


Most likely you put the thesmostat in upsid down. Good luck

Aug 17, 2011 | 1990 Subaru Legacy

2 Answers

Coolant reservoir is overfulling after being driven


It probably got overfilled at some point. There's a max line on the reservoir that you shouldn't fill it over. Coolant expands as it heats up so if there's too much in the system, it's normal for it to overflow.

May 26, 2011 | 2001 Jaguar S-Type

1 Answer

Drained and filled the coolant radiator, (5.3L V-8, 118K). Started the engine and let it warm up all seemed OK. Ran it on te road and the temperature gage went up high, no hot air out of the heater. ...


That's unlikely. More likely is that you have an air pocket from the draining procedure. You should fill your radiator as high as you can after draining it, then, with the cap still off, start the engine and continue to fill as it runs. Have a helper keep the engine at around 1500 RPM and have the heat on. When the engine gets warm enough, the thermostat will open, and you may notice a drop in the coolant level. Keep filling the radiator until it will take no more. Then, put the cap on, make sure the overflow reservoir is filled, and turn off the engine. The cooling down process will draw in more coolant if needed.

Dec 13, 2010 | 2000 Chevrolet Silverado

2 Answers

90 legacy, started overheating but was blowing cool air out of the heater even as the needle was pegged. Some fluid in reservoir, top radiator hose felt like it was under a lot of pressure.


Two things would cause this

There is a slow leak and the radiator is low on fluid

Let the vehicle cool down completely and then check the level in the radiator. I bet its pretty low. Top off the radiator with a 50/50 mix of coolant and water. start the vehicle and let it warm up with out the radiator cap on. Keep adding fluid as necessary. While waiting for it to warm up check around for any abvious coolant leaks. Things like hoses, radiator seams, water pump, water inlet/outlet gaskets. If no leaks are found it may be necessary to pressure test the cooling system and even then it might be a slow leak that only occurs when the vehicle is cold.

If the radiator is full than I would suspect that water pump is no longer working or creating enough flow. If the thermostat where stuck you would still get heat. If the water pump is not circulating coolant than you would get no heat and the car would overheat.

Nov 11, 2010 | 1990 Subaru Legacy

2 Answers

98 subaru, overheating


most likely not. it's most likely the thermostat, it holds the coolant in the engine block to warm it up, then opens to keep the engine at a general temperature range. It goes bad and stays closed, hence the overheating

Mar 21, 2009 | 1998 Subaru Legacy

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