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96 Subaru Legacy Overheating When Heat On
Here are the repairs so far:
Visit 1: Flush radiator. Mechanic couldn't get it to overheat, said it was probably an air pocket. Overheat with overflow into reservoir 10 minutes later.
Visit 2: Replace radiator cap. Overheated with overflow 5 minutes later.
Visit 3: Replace thermostat. Mechanic said that part of the radiator and the lower hose was cool, so it had to be the thermostat. 20 minutes later, overheated-overflowing reservoir.
Visit 4: Replace radiator. New mechanic said the radiator was cool, sure sign that it was clogged. 30 minutes later... well... you know the story.
I'm not really in a position to dump a bunch of money into narrowing down the problem by fixing everything but the problem itself until someone finally stumbles onto it. And it seems like everyone is ignoring the fact that it runs fine when the heat is off. Anyone have this problem before?