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Old 12-14-2008, 01:00 PM   #1
ratso
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Default HELP...Overheating issue!

97 Legacy GT, 2.5L, pure stock (the wife's car). 146,000 miles. Yesterday it overheated after a 5 minute drive. I noticed the car had no heat, was blowing cold air. Boiled over about 2 minutes later.
Has full level of fluid, I pulled the T-stat thinking it was stuck. Put it in a pot of water on the stove with a thermometer. Started opening at around 170, full open at 190. Changed it anyway. Still have tyhe same issue!
Fired it up this morning, it is about 35 degrees outside. Temp gauge was coming up, but still had no heat. Scan tool hooked up says the coolant was at 235. Then heat came on for a while, temp gauge cam down to normal level, then blew cool again and temp gauge went high. Upper hose (return) is very hot. The lower hose going from radiator to T-stat is always cold. What gives? The water pump is about 2 years old and has 15,000 on it. When I had the stat out, I looked up in the water pump opening and saw the impeller. Looked OK. It spins when the motor is cranked over. It runs off of the timing belt, correct? So it is not like it can't be spinning. What would make the heat in the car go from real hot to cool air and the overheat the motor?
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Old 12-14-2008, 02:00 PM   #2
piperpilot26
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hmm...I was just going to say to try the water pump, but if the impeller looks good then I would have to say the t stat. make sure its in correctly.. but if its not either then Im stumped.
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Old 12-14-2008, 02:38 PM   #3
ratso
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Yep, stat is in the right way. Tried burping the system, no good. Noticed a few air bubbles in the overflow/resorvoir. Does that mean head gasket?
So I drained it all again and drilled two 1/8" holes in the T-stat face in case there was air pockets being caused by a blown head gasket. Now it runs fine. Bottom hose is hot now, but there are much more bubbles in the resorvoir. Car has heat now also, so I guess it has a blown head gasket and the trapped air/gases would not let my pump flow? Drilled holes gave it a path to excape? Other than seeing bubbles in the overflow tank, I would have no idea it has a problem.
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Old 12-25-2008, 04:12 PM   #4
3rdgearpinned
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so you determined it has a blown head gasket? my car is having similar problems.

Where did you drill the holes exactly?
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Old 12-26-2008, 06:08 AM   #5
mattmcnew
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Bubbles in the coolant overflow tend to mean a blown headgasket,I would know because my car definitely has one,and it does that.

It also tends to blow all the coolant out of the radiator when i go WOT =[.
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Old 12-29-2008, 05:37 PM   #6
ratso
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Quote:
Originally Posted by 3rdgearpinned View Post
so you determined it has a blown head gasket? my car is having similar problems.

Where did you drill the holes exactly?
I drilled two 1/8" holes in the face of the T-stat so water can flow through it when it is still cold/closed. Olny a temporary solution because it takes forever to warm up now and still blows exhaust into the coolant. Only a matter of time before it gets worse. At least the car is driveable until I get a new one.
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Old 12-29-2008, 05:53 PM   #7
blackfang
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I would not rule out blown headgaskets.
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Old 12-29-2008, 05:56 PM   #8
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Quote:
Originally Posted by ratso View Post
I drilled two 1/8" holes in the face of the T-stat so water can flow through it when it is still cold/closed. Olny a temporary solution because it takes forever to warm up now and still blows exhaust into the coolant. Only a matter of time before it gets worse. At least the car is driveable until I get a new one.
your head gasket. it's no longer gasketing...
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Old 01-03-2009, 10:19 PM   #9
mike 53
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Default Don't put it on the stove

Just a quick word on that blown head gasket . Your description does indicate a blown gasket but it is very close to a blocked heater core also . I recommend trying it out with the heater core bypassed as a last resort before changing HGs It would be a shame if that was all it was
The conditions inside the water pump with a swirl of different temperatures means that the only way to check a subaru thermostat is to replace with a genuine one Mike
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Old 01-03-2009, 10:40 PM   #10
a1killer
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like everyone has said it could be the t-stat the pump or the heater core or you could have some scales in your fluid. You should check your fluid maybe even change it, check your heater core and or change it out or check your head gasket and replace it.
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