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Old 11-09-2019, 02:57 PM   #1
dirtbiker9779
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Default 2007 Subaru WRX Overheating Randomly

So I'm having a problem with some overheating issues. It started about a week or so ago and I'm stumped on what to do next. It will drive just fine until it gets up to temp, then I can only drive it for about 20minutes before the temp starts rising. It pushes all of the coolant I to the overflow (if I poor it back into the radiator it fills it perfectly back to the top, so it's not burning or leaking). It has about a 155k miles on the car, and I bought it with 126k miles from a mechanic who bought it to flip it (it needed head gaskets so he replaced them). I haven't had any problems with it until now. I have already replaced the thermostat and radiator cap. What can I do to figure out where the problem is coming from? (There is no coolant in my oil and no oil in the coolant).

If I let the car sit after it starts to get a little above normal, and I dump the coolant from the overflow back in so it's full, it's good for another 20minutes or so
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Old 11-11-2019, 02:42 PM   #2
yarrgh
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Chapter/Region: RMIC
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Maybe the radiator is getting clogged up. Shoot an IR gun at it in various places to see if there are differences in temps.

When the head gaskets were done, were the heads checked for flatness? You can test the coolant for hydrocarbons.

Are the fans running?
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Old 11-12-2019, 02:29 AM   #3
dirtbiker9779
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The fans are running, it is an aftermarket radiator and it seemes like it flows fine (judging how fast it drained when I took off the lower radiator hose), they were done about 30k miles ago (about two years) and I don't know if they were resurfaced or checked for flatness. How can I check for hydrocarbons in the coolant?

It also seems like there's a little bit more than what I would think "normal" pressure in the radiator when I take the cap off

Last edited by dirtbiker9779; 11-12-2019 at 02:51 AM.
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Old 11-12-2019, 08:15 PM   #4
yarrgh
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2001 2.5RS
Black Diamond Pearl

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you can rent testers at parts stores.
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Old 11-14-2019, 10:34 PM   #5
dirtbiker9779
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So the hydrocarbon test came back positive, but it's only a one way leak (compression is leaking into the coolant system but it's not a big enough leak for coolant to get by).

Would running like blue devil gasket sealer work for a quick fix? I'm just trying to not pull the engine to do head gaskets right now
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