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Old 08-11-2006, 02:51 PM   #1
Scooby Newbie
Member#: 122703
Join Date: Aug 2006
Default Overheating problem....

Ok, So I am a chevy guy and not a subaru guy. I am new here, but I am very familiar with cars and how they work. I own a 11 second camaro.

Anyhow, my father in law brings his car over to the house and says its overheating. I check the upper rad hose and it feels pretty warm, i jack the car up and the lower hose seems cooler. So I think its the thermostat. I replaced the thermo stat and refill, get the air out of the system and take it for a test drive. The car starts to climb pretty fast after 2-3 blocks. I turn around, by the time I get home the car is almost pegged at high. In the process of heading home I decided to turn the heat to hot and turn the fans on as fast as possible. However, I dont get any hot air. So I then think its the waterpump. so I check into replacing the water pump and realize what a pain it is. It seems to be like it is run off of the timing belt? Is this correct?

I checked and made sure the fans come on etc. The only other thing I could think it would be is the head gaskets... However, if the heat isnt transfering into the core and blowing hot air when it says its over heating I tend to think its the pump..

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Old 08-11-2006, 04:37 PM   #2
Scooby Specialist
Member#: 11620
Join Date: Oct 2001
Location: Ontario
1997 GF4-STiV3 clone


It is likely the headgasket. What year and model?
The HG leaks and puts air into the system. You get an airpocket and the pump can't flow anything. So one side is hot and the other is not and the heater won't work.

If it is a 96-99 Legacy or 98 Impreza/ Forester with the 2.5l then 9/10 it is the HG. The water pump is a pain to change and it is not likely your problem, but you can alway change it when the you do the HGs.
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Old 08-11-2006, 05:55 PM   #3
ROC pit-bull
Scooby Newbie
Member#: 67814
Join Date: Aug 2004
Chapter/Region: Tri-State
Location: rochester ny
1995 legacy L


I would say its a head gasket. Change the timing belt and the water pump.
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Old 08-11-2006, 06:46 PM   #4
Tim Sanderson
Scooby Guru
Member#: 6486
Join Date: May 2001
Chapter/Region: MWSOC
Location: S.E. wisconsin
00 Impreza 2.5 RS
Blue Ridge Pearl


Bubbles in the coolant overflow when running?
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Old 08-11-2006, 10:10 PM   #5
Scooby Newbie
Member#: 122703
Join Date: Aug 2006

1998 2.5 Legacy.

It was working fine from what the owner told me and then all of a sudden on the highway it started to overheat. There were no bubbles that I could see in the overflow tank. I let it idle for like 10 minutes and it was about 210 degrees or so by looking at the thermostat reading in the car.. No bubbles in the tank, and the engine was fairly warm to the touch, no scorching hot.

It has like 90k miles.

Thanks for the help.

Anyone know where I could go in AK to get a carbon test done to see if its the HG?
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