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Sorry to say, but you probably have a blown head gasket. My brother just had this same thing happen to his Sooby over the weekend and that's what they told him. Do a Google search on "Subaru Head Gasket Problems" and you'll see what I'm talking about.

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Hi! I have some info that might help you also. First, did the car run cool and fine before you changed the pump and thermostat? If so, you may only need a thermostat. I changed my pump and thermostat on my 95 2.2L, replaced the thermostat with a cheap one from NAPA, and ran it. My motor ran hot, my radiator fans ran constantly, and my temperature guage jumped up and down, never getting cooler than half way. I pulled out the NAPA thermostat, bought a factory thermostat from a Subaru dealer, and put it back in. It cured all of my overheating problems, my fans hardly ever run, and my temp guage stays at about 3/8 into the normal. It seems like some things on these cars you MUST replace with factory parts, or it will NOT run right! My thermostat costed about $22.00, pretty cheap fix if this is your problem! Hope it helps!

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โˆ™ 2009-12-22 00:47:15
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Q: Why would 1998 Subaru outback overheat after replacing thermostat water pump?
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