Question about 1996 Subaru Impreza

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I got a 1996 subaru impreza 2.2. The thing started overheating and blowing cold air from the vents when you turn the heater on. I changed to thermostat and i know thats not what it is. what could it possibly be?

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If the Coolant is being pushed back out, I would suspect a head gasket. Sorry to tell you that but at least its a Subaru and they built the car better than anyone else. Not a real hard job and parts are less expensive than others. First I would do a compression check to find which head is leaking. Sometimes when you pull a plug it will have water on it. If it is not a bad leak it will just loose coolant and heat up. I wish you luck and have a good day.

Posted on Mar 11, 2009

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Re: Overheating and blowing cold air
I have been a mechanic for 20 years. Your problem is the heater core is plugged. The cold water from the radiator blows directly at the thermostat keeping it closed even when you are overheating! BAD DESIGN!! If you look at the water flow charts in AllData you will understand. If you rev the motor to 3,000 rpm's the turbulent HOT water at the water pump impeller (near the thermostat) will reach the thermostat to open it and the car's temp will fall very fast to the correct temperature. If you remove the thermostat it will not overheat but will run way to cold. If you bypass (loop) the heater core it will not over heat.

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Nobody knows this little secret. Not even Subaru mechanics at the dealer, no TSB (Technical Service Bulletins a special note after the fact to mechanics). After days and days of trouble shooting a 1993 Subaru Impreza (2.0?) I looked at the water flow chart and then it was clear what was happening. This phantom overheating problem stumps the best mechanics and sends many Subarus to the crusher.

http://www.subaruoutback.org/forums/...threadid=17264

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