Why is coolant in my radiator filliing up my overflow tank

chipsapf1
0

Asked by Aug 09, 2013 at 12:45 PM about the 1990 Subaru Legacy 4 Dr L AWD Wagon

Question type: Maintenance & Repair

my subaru starts getting hot after 2 or 3 weeks. coolant goes into overflow tank. Does anyone out there know why? Is it  my radiator cap? Thermastat?

2 Answers

tenspeed
87,135

It could be the radiator cap not holding the pressure. If you see bubbles as it fills the reservoir, it could be a blown head gasket.

I'd look at two things...the condition of the underhood area for evidence of a prior overheat and whether or not "PANIC" plain water was used never to be replaced with proper 50/50 mix...yet~?

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