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Old 04-29-2001, 11:00 PM   #1
Scooby Specialist
Member#: 1176
Join Date: Mar 2000
Chapter/Region: MAIC
Location: Potomac, MD
2012 MB E550 4M
2015 P85D

Post Engine Overheat

I have just experience a very scary senario...while playing cathup with a civic and integra...my99 legacy 2.5 GT was experiencing a very high overheating characteristics...my gauge was in the middle of the "H" on my engine temperature gauge...so I stopped playing and pulled of to a safe area...With the car in stopped and parked my oil light came on, flickering at first!!! Then I smelled radiator fluid...I popped the hood and saw that the resevoir overflowed...there is radiator fluid everywhere on the front rightside of the engine...I checked my oil and it was perfect, so I assume I didnt blow the oil pan gasket...the radiator hose was rock solid with enormous pressure and very very hot I might add!!! While letting it sit for 30 min. I then drove it immediately home where again it went back up to "H"!!!

I did noticed that my heater no longer works as well as A/C!!! I put on hot it give me outside air...I put it on A/C and its like the compressor isnt on!!! WHAT GIVES???


Is it a blown thermosat???
Do I need a radiator flush???
I am taking it to the dealer tomorrow morning hopefully it wont cost me an arm and a leg!!!


and THANKS!!!

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Old 04-29-2001, 11:10 PM   #2
North Ursalia
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<FONT face="Comic Sans MS">Most likely the thermostat is stuck shut... that would cause the hose to turn rock solid with built up pressure, backing things into the overflow. Also, it's the cheapest thing to replace first

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Old 04-29-2001, 11:23 PM   #3
Mike Moffa
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Join Date: Jun 1999
Location: Montreal, Quebec, Canada
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Like North Ursalia said, check your thermo first.. But I had the same problem with my car.. and It was a blow head gasket, and the pressure was going back, and make the thermo stay close, and hte engine to overheat, and make the coolant overflow... Hope for you its not that.

Let us know man.
take care
Mike M
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Old 04-30-2001, 12:28 AM   #4
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Member#: 1655
Join Date: Jun 2000
Location: Novato, CA
MY98 RS w/WRX Conv
I-Speed Tech

Thumbs down


I had the same problem, resulted in blown head gaskets.

Apparently, the design of our engines makes the thermostat stick closed when the gaskets are blown. The combustible gases build-up behind the thermostat. They also pressurize the cooling system and push-out the coolant, hence coolant in the overflow bottle and all over your engine.

I had the same problem for many months, even did it after I removed the thermostat.

You should be OK, as long as you're under the 5yr/60k drivetrain warranty.

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Old 04-30-2001, 05:13 AM   #5
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I concur, classic symptoms for our Subarus with blown head gaskets. Also of note is that your MY99 GT is a DOHC similar to the MY98 RS, which have a history of head gasket problems. (I know, too.)

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Old 04-30-2001, 05:16 AM   #6
Precious ❄
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Location: Norfeast

Sounds like a head gasket.
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Old 04-30-2001, 07:52 AM   #7
Subie Gal
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Location: WA
1970 FF-1 & '70 Van
02 WRX/01 RS


what year is your GT ken??? 99... just like mine eh...

well mine did that... just once... and briefly...
overheated... thermostat got stuck..

result??? cylinder #2 blew... new short block.... weak arse Phase I engines!!!
Likely your car will need either a new head gasket or a new short block...

stop driving the car NOW...
and get it into the shop.

have them run hydracarbon tests... today!!
Phase I engines... sucks dont it...

j. www.subiegal.com

[This message has been edited by Subie Gal (edited April 30, 2001).]
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Old 04-30-2001, 08:04 AM   #8
Precious ❄
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Location: Norfeast

Actually, if it's still under warranty, I would personally drive it a little more. A new short block for free would be nicer than a new headgasket for free. Although you would likely be w/o you car for a while.
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