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Old 01-07-2005, 12:39 AM   #1
Scooby Newbie
Member#: 72712
Join Date: Oct 2004
Default Over-heating

I have a 97 legacy GT and it keeps over-heating the vehicle has 140,000 miles on the 2.5L engine. At first the only time the gauge would start to climb was under high load or when going up hill or at high speeds. Now it has started to do it alot more often. I have topped the coolent up alot recently but I am not able to pin point if it is just boiling over or if it is going out the exaust from a blown head gasket? I was wondering what the average life span of a subaru water pump is or if any one has had similar problems do to head gaskets, rad fans, water pump ect. Also what should I do to test each component.

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Old 01-07-2005, 03:37 AM   #2
Scooby Guru
Member#: 10309
Join Date: Sep 2001
Chapter/Region: NWIC
Location: Seattle, WA
'02 OBS 2-tone!
'95 Montego Miata


Rad fan is unlikely, as that would tend to hit when moving slowly, like stop and go traffic.
Head gasket is the big bucks possibility. I think it's time to take it to a Subaru-specialist mechanic and have them diagnose it. Overheating can easily damage the engine, so I'd do it sooner rather than later. A water pump could certainly need replacing by 140k, but they usually start leaking for a while before they fail, a little dripping. Another possibility is clogged radiator.
At the least, a mechanic should be able to fairly quickly rule out (or in!) a head gasket problem -- it's worth buying at least an hour of diagnostic time for this.
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Old 01-07-2005, 06:19 PM   #3
Scooby Specialist
Member#: 32846
Join Date: Feb 2003
Chapter/Region: MAIC
Location: Elkton, VA
1998 Impreza L-SOLD
Arcadia Green

Default Head Gasket, Thermostat, Water Pump, Radiator, Overheat

Have you ever replaced the Thermostat or Water Pump? I see you have 2.5 liter, hopefully it won't be the head gasket which can be confirmed via compression test or cylinder leak down test. As for the water pump, it will leak when it goes bad or whine if the bearing goes. The Thermostat will either stick open or closed, when it sticks closed, your car will overheat. Start your car in the morning and let it idle. The thermostat runs to the bottom hose, but if the car is running hot and one of the two hoses (upper or lower) is still cold, it's likely a thermostat.

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Old 01-07-2005, 11:59 PM   #4
Scooby Guru
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT


I replied in the Legacy forum.
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