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Old 10-27-2012, 10:03 AM   #1
rdstamou303347
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Default 2000 2.5rs over heating PLEASE HELP!

SO the other day i was driving home from work and my car began to over heat. So i left it in a parking lot for a few hours and came back later to see if would overheat again. When i drove the car home it didn't overheat but i decided to change out the thermostat because i figured it had stuck and wouldn't open.

Now about 5 days later i was driving home from work again and it overheated again. This time i was a little more observant. When it began to overheat i immediately turned on the heat to try to get the thermostat to kick on and the car bagen to blow cold air through the vents instead of hot. I though this was weird so i pulled over and the antifreeze was overflowing through the overflow tank and not the radiator cap. I thought this was a little odd. At this point i turned off the car and i realized that i could actually touch the engine because it was not very hot. Definitely not hot enough to be overheating. The radiator hoses were both hot bot the radiator did not seem to be.

So my question is what everyone's opinion is on the reason this is happening. The car is clearly not overheating. Is it a problem with the radiator cap which is causing the antifreeze to blow through into the overflow? Also i thought i would note that the temperature gauge was all the way up. This is how i knew that it was overheating. I was also thinking that it was a possibility that there might be some sort of relay or temperature gauge that was causing the computer to the the car was too hot and therefore causing the temp gauge to skyrocket and the antifreeze to blow through.

Any and all recommendations are welcome. Please help me because these symptoms are confusing me and i have never seen anything like this.
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Old 10-27-2012, 04:16 PM   #2
RaceFaceXC
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I would suspect a head gasket. Is it a 2.5 sohc?
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Old 10-28-2012, 02:08 PM   #3
rdstamou303347
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The head gaskets were done about 4k miles ago. So I was really hoping that wasn't the case. I was doing research in other places and people said that it may be air in the system that needed to be burped. Does anyone know if this would give the same symptoms?
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Old 10-28-2012, 02:10 PM   #4
rdstamou303347
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And yes it's a 2.5 sohc. And I also checked and im not getting antifreeze in my oil.
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Old 10-28-2012, 03:25 PM   #5
Chaz2.5
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Air in the system can cause issues. Also, after you replaced the t-stat did you overfill with coolant?
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Old 10-28-2012, 03:30 PM   #6
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Have you checked the filler neck of the radiator, sometime the neck rots away where the cap should seat, theres a little raised area that sometimes rots away there.Did you put a new cap on yet? this always gets overlooked. Hope this helps and it doesn't end up being to big of a job.
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Old 10-28-2012, 06:50 PM   #7
rdstamou303347
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Quote:
Originally Posted by Chaz2.5
Air in the system can cause issues. Also, after you replaced the t-stat did you overfill with coolant?
How would I know if I over filled it? When I replaced it I filled the radiator back up and filled the overflow to full. I have been reading though and think it may be air in the system. Do u know what the best way to burp the system is?
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Old 10-28-2012, 06:54 PM   #8
rdstamou303347
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Quote:
Originally Posted by fod1
Have you checked the filler neck of the radiator, sometime the neck rots away where the cap should seat, theres a little raised area that sometimes rots away there.Did you put a new cap on yet? this always gets overlooked. Hope this helps and it doesn't end up being to big of a job.
The filler neck seems to be fine and I replaced the cap. The antifreeze is not leaking from the cap when it over heats. It is coming out of the overflow. Also, the engine does not seem to be too hot when it is "overheating". I am able to touch the heads with my hand without burning them. I was doing some research and found that this over heating on the temp gauge while the engine is not actually overheating may be caused by ect sensors. Does anyone have experience with these? I am just confused as to how the gauge can say its overheating and the heads are still at a low enough temperature to touch with bare skin.
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Old 10-29-2012, 04:45 PM   #9
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Definitely sounds like air in the coolant system, take the radiator cap off and start the car. Let it idle, and make sure you top off the radiator when it burps. it's a hell of a lot easier with a spill-free coolant funnel FYI, but ive done it without the funnel just gotta keep your eye on it
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Old 10-29-2012, 11:28 PM   #10
RaceFaceXC
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Quote:
Originally Posted by rdstamou303347 View Post
The head gaskets were done about 4k miles ago. So I was really hoping that wasn't the case. I was doing research in other places and people said that it may be air in the system that needed to be burped. Does anyone know if this would give the same symptoms?
Quote:
Originally Posted by rdstamou303347 View Post
And yes it's a 2.5 sohc. And I also checked and im not getting antifreeze in my oil.
air in the system is not uncommon on a subaru cooling system after it has been emptied but i dont see how it would push coolant out the overflow if it was not being pressurized from some source.

Coolant in the oil is not a failsafe symptom of a failed HG. That would be case only if the HG fails into the cylinder from a water jacket or from a water jacket to an oil galley/drain. if it fails externally, you should be able to find evidence of it somewhere on the head/case interface.

how did you check your oil for coolant?
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Old 10-30-2012, 01:08 PM   #11
Patrick Olsen
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Exact same symptoms I've seen every time my head gaskets have gone bad (which is 4 or 5 times).

As RaceFace said, an air bubble in the system wouldn't cause the cooling system to blow coolant out the overflow bottle.
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