Question about 1999 Subaru Legacy
The 97-99 2.5L DOHC Subaru engines were notorious for this problem, blown head gasket is very likely the cause. It is possible to test for the presence of exhaust gas in the coolant to verify. The reason the car seems to be overheating then cools down quickly when shut off is that the hot exhaust gas displaces the coolant at the top of the engine where the sensor is. If it happens consistently you will need to deal with it, I have worked on an engine that was run many miles under this condition and it damaged the block beyond repair. If you are a decent shade-tree mechanic, it is possible to do the work with the engine still in the car, you will have to raise it up an inch or two to get sufficient access. I have personally done 3 engines with this problem, a 98 and 2 99's.
Posted on Jan 19, 2009
I had this problem - it was a blown head gasket. Contact Subaru to see if you're car is covered by a limited recall - if not they may offer to help pay for the repair. Good luck.
Posted on Dec 10, 2008
Check engine cooling fan operation.easy way to check is turn a/c on and fan should run when ever a/c is on.
is air flow through rad restricted(dirt,bugs) ?
is cooling system air locked ?
Posted on Oct 21, 2008
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