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Old 10-01-2003, 06:44 PM   #1
Scooby Newbie
Member#: 17035
Join Date: Mar 2002
Location: Dallas, TX
02 WRX

Default Strange sound after coolant flush?

I've got 33k miles on my 02 WRX. I recently flushed the coolant, and now after the car is fully warmed up, it makes a weird sound. It sounds like a low pitched, ringing sound. It comes on for a second or two, then goes away for maybe 30 seconds or a minute, and just repeats like that. The sound doesn't happen until I've been driving the car for 10 minutes or more from a cold start, and I only notice it at idle. It might be happening while driving too, but I never hear it.

It sounds like it could have something to do with the thermostat. When I flushed the coolant, I noticed a bunch of paint flakes on the resevoir like a bunch of people have been reporting in early 02's. I cleaned off the lip of the tank, but there was still stuff in there.

Is there anything I should check? Is it worth the time to pull the thermostat?
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