Question about 1995 Subaru Impreza

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Overheating hi i have a 95 WRX with an overheating problem. The radiator had a leak but only under pressure so i changed the rad, prior to changing the rad the temp was going up with loss of water and cold air would come from the heater when on full heat then it would go to hot and bring the temp down. Prior to changing the rad it stopped giving heat from the heater completly. Having changed the rad and filled up it is still overheating, the top hose feels very pressurised and warm but the bottom hose is cold but pressurised and the heater will only blow out cold air. I have purged the system and re filled up assuming a possible air pocket however this didnt work. I dont think its the pump as i cant hear it. i am thinking its probably the thermastat stuck closed? or it still has an air pocket and needs purging in a different way? i am presuming that the thermastat is housed at the end of the top hose? can anyone help many thanks in anticipation. Mark

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  • markyb1 Dec 22, 2008

    Thanks for solution but i have replaced the thermostat and the problem is still the same. the system has pressure as the water is coming out of the cap and over heating with no heat from the heater any ideas?



    thanks Mark

  • Anonymous Jan 20, 2009

    hi i have the same problem on my 1993 model impreza as markyb 1. I have put a new water pump on, a new thermostat and after being told by 2 different mechanics it was an air lock, i bled the system about 4 times and i still have the same problem. please please help! would it be my head gasket?

    there is no steam when engine is warm and no water in the oil.

  • markyb1 Mar 01, 2009

    ok i tried a new thermostat then a new header tank as the previous 1 had a split. purged the system and it seemed to be holding temp as normal but still no hot air from heater so i decided to give it a little drive, 50 yards down the road bang! steam everywhere got it back opened bonnet to see a split top hose which when running the engine up to temp felt like it was highly pressurised - any ideas?

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Yes, you re correct! thats a thermostat issue.

Posted on Dec 15, 2008

  • Kuya Louie Dec 22, 2008

    try running the engine and when its already hot, turn on your ac see if the temp would go down, if it is, your fan or your temperature sender is not working properly.

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I have a 2005 Suzuki Aerio that keeps on overheating change the thermostat change the radiator but a hose is building pressure causing it to burst


bad hoses.!! heck they are 10 years old, none last for ever.
a hose that fails is a bad hose. but some old hoses can be
pushed of the edge, sure, but hose is bad never the less.
is the rad cap new,? (do that first) use correct cap, pressure rating
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my guess is you have venting? (name all overheating facts, SIGNS)
arethere signs oif steam and oil and carbon in the rad side tank or at filler hole (cold checked only)
if yes, that can be bad head gasket or far worse.
get the rad pressure checked (hand pump) leak down test.
then check the rad for exhaust gasses. blue/green tester.

does it only overheat parked.? when?
if it stays cool moving that means the fan is dead, parked.
the natural pressure is 12-14psi regulated by the cap.

you need to do tests first. not change parts.
are you going to replace all parts only to find a warped head.?
i cant hear engine run, nor do rational analysis.
nor see it mess up, or when and how bad. not me. im blind.
asking net bunny's (blind) how to fix this is over the top.
why not get the car serviced by a pro that has all those tools.
(at least 3 tools)
compression tester.
rad leak down finds leaks and if block head cracked or head gasket blown.
green/blue rad cap tester. (exhaust leaks)
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Don´t forget to give a fixYa rating Please !

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