Why does my 2004 Subaru overheat then cool down while driving?

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May 11, 2025 at 7:23 pm #1117 Reply
Kyle
So, got a quick question. Got a 2004 Subaru and after 15–20 minutes of driving the temp gauge goes to red then will go back down to halfway no lights on dash coolant level is fine radiator hose is warm while running, I heard possible thermostat or water pump malfunction.
May 11, 2025 at 7:23 pm #1118 Reply
Mike
Sticking thermostat.
May 11, 2025 at 7:23 pm #1119 Reply
Matt
I had a 99 Outback a long time ago.

I was having that issue with the temp climbing up and going back down. It was the head gaskets. It was a hairline break, causing exhaust to leak into the coolant.

You’re going to need to check your coolant for exhaust.

It won’t show up unless you can get it to overheat.
May 11, 2025 at 7:23 pm #1120 Reply
Adrian
Take it off and put it in water and heat the water to boiling and see if it opens.
May 11, 2025 at 7:24 pm #1121 Reply
Chris
I’m thinking thermostat or engine coolant temp sensor. Both not too expensive to replace to see if they fix the issue.
May 11, 2025 at 7:24 pm #1122 Reply
Gary
Check your pressure cap.
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