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Old 10-06-2010, 09:29 PM   #1
01 gt
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Default Over heating !! Need

I just did a tune up less than 200 miles ago and my car has 94,xxx miles . I also changed the water pump timing belt and thermostat at the same time. My car started to overheat last night . On freeways it good but once i stop to idle for a light it slowly creeps up. My 1st thought maybe it could be the radiator . I changed it and still overheat. Any ideas of what may cause it to over heat? I really hope it not the headgasket. Also i notice that my lower radiator hose is pretty cool and not hot . Is that normal? Also my fans come on and stay on constant , i dont know why. My car is bone stock. Do you people think i have a faulty thermostat? or waterpump? I used aftermarket parts on my car .
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Old 10-06-2010, 09:52 PM   #2
Jessekrs123
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1. What car do you drive?
2. Did you burp the radiator?
3. The lower radiator hose should be somewhat cold, that would be the cold coolant entering the engine, the top hose is the hot one.
4. What aftermarket parts?
More detail please.

Last edited by Jessekrs123; 10-06-2010 at 10:02 PM.
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Old 10-06-2010, 10:01 PM   #3
01 gt
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Quote:
Originally Posted by Jessekrs123 View Post
1. What car do you drive?
2. Did you burp the radiator?
3. The lower radiator hose should be somewhat cold, that would be the cold coolant entering the engine, the top hose is the hot one.
I drive a 01 legacy GT and is there a write up on hwo to burp the radiator?
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Old 10-06-2010, 10:10 PM   #4
Jessekrs123
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When I burp my radiator, I take the radiator cap off, start the car, let it get to operating temperature, and just keep topping the coolant off until you can't get anymore in there, this could take anywhere from 5 to 15 minutes depending on how much coolant was originally in there, the coolant will keep bubbling into the radiator until you top it off. Once you top it off, put the cap back on and drive it, you should be good to go if that is the problem.
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Old 10-06-2010, 10:39 PM   #5
FlyWire
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May sound silly but are you sure the thermostat didn't get put in backwards?
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Old 10-06-2010, 11:31 PM   #6
PhilSine
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Originally Posted by FlyWire View Post
May sound silly but are you sure the thermostat didn't get put in backwards?
+1 to this. Especially since you mention the lower hose is not very hot.
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Old 10-07-2010, 01:03 PM   #7
01 gt
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+1 to this. Especially since you mention the lower hose is not very hot.
i read around and i keep reading that the lower hose wont be as hot as the upper hose. I mean the hose is not freezing cold just not as hot as i thought it be and i did put in the thermostat the right way in.
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Old 10-07-2010, 01:13 PM   #8
Jessekrs123
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Quote:
Originally Posted by 01 gt View Post
i read around and i keep reading that the lower hose wont be as hot as the upper hose. I mean the hose is not freezing cold just not as hot as i thought it be and i did put in the thermostat the right way in.
Ofcourse the bottom hose isn't as hot as the top one. The heated coolant comes out of the engine at the top, enters the radiator, enters the radiator and cools, then the cool coolant enters the engine at the bottom. This is perfectly normal, it just means that your radiator is doing its job and is not the cause of your overheating. Did you burp the radiator yet?
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Old 10-07-2010, 01:48 PM   #9
01 gt
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Quote:
Originally Posted by Jessekrs123 View Post
Ofcourse the bottom hose isn't as hot as the top one. The heated coolant comes out of the engine at the top, enters the radiator, enters the radiator and cools, then the cool coolant enters the engine at the bottom. This is perfectly normal, it just means that your radiator is doing its job and is not the cause of your overheating. Did you burp the radiator yet?
i kinda let it burp. Let it sat for 5 mins with rad cap off and there were air pocket coming out from radiator. Didnt get a chance to finish but ill try again today.
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Old 10-07-2010, 04:19 PM   #10
mctwin2kman
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The thermostat needs to be open to properly burp it so the engine has to be up to temp. And you very well could have got a bad thermostat as well. But getting the air out should be your first priority.
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Old 10-08-2010, 05:31 PM   #11
LHMTECH
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Ya air coming out of the radiator on that vintage legacy almost 90% chance the headgaskets are blowing pressure into the cooling system. With already changing thermostat and radiator and water pump and still overheating i would bet money that your headgaskets have popped!!
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Old 10-09-2010, 11:51 AM   #12
01 gt
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Problem solved , all i change out the aftermarket thermostat to the oem one and new gasket . Thanks guys/gal for your responses.

PS : FYI aftermarket thermostat is half the size of a oem one . I never knew that
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Old 10-09-2010, 11:52 AM   #13
01 gt
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Quote:
Originally Posted by LHMTECH View Post
Ya air coming out of the radiator on that vintage legacy almost 90% chance the headgaskets are blowing pressure into the cooling system. With already changing thermostat and radiator and water pump and still overheating i would bet money that your headgaskets have popped!!
FAILED!!!! you would have lost your $$$
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Old 10-09-2010, 04:50 PM   #14
LHMTECH
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Lol indeed Im glad it was just a thermostat for your sake but i guess i underestimated the horriable quality that some aftermarket parts provide.
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Old 10-10-2010, 09:37 PM   #15
RaineMan
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A good reason to retain the stock part and take it with you to the parts store for comparison. If the replacement you get is significantly different from the OEM part, there is obviously something wrong.
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