Question about 1990 Subaru Legacy

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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.

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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.

Posted on Nov 11, 2010

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  • Master
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If the system is very low on coolant, this can cause no heat+overheat, also a thermostat not opening properly. A loose or missing belt or a bad impeller on the water pump. First let it get good and cool make sure it's full of coolant and get it checked asap, as subaru head gaskets don't last
long when overheated. Hope this helps.

Posted on Nov 11, 2010

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Hi, there is a gurgling sound coming from my BH5 2 litre N/A Legacy. Yesterday it started overheating, it has yet to reach past 3/4 on the temp gauge but that's only because I stopped driving it


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2004 Chevy Tahoe. Heater working only at higher speeds.


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Leave cap on but loose, so bubble can purge.
Turn heater on.
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please Rate as fixya if this works. good luck

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ok here we go and you aren't going to believe it...
I replaced the thermostat step one

I noticed that I had a small leak at the engine side of upper hose fixed that by taking it off and cleaning it and putting the hose back on Step two

then while refilling the reservoir with coolant i found that the hose that was supposed to be in the fluid was curled up on top and not sticking down in the fluid where it should be.
played with the hose until i got it to fall down in the reservoir where it should be Step 3

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I really think that the hose in the reservoir not being in the right place and pulling air into the system instead of coolant is the real culprit of this drama, but i replaced the thermostat to be safe.

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