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420A Overheating issue


Probationary Member
Jun 22, 2018
Gainesville, Georgia
Hi everyone, I've owned my first dsm for about a month now(N/A 420a 5spd). I've recently been having a overheating issue, coolant is fine, I've flushed it many times. Upon further inspection I realized the previous owner didn't even have a radiator fan fuse(HI) in it. I've thought all along I had a bad head gasket(which I probably do because of this). It doesn't overheat til a good 30 min after driving. I would appreciate any input as if this would be the culprit or not. Thanks!

I included a picture below to show which fuses I'm talking about.
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15+ Year Contributor
Jul 4, 2003
Albuquerque, New_Mexico
Check your radiator cap & make sure it's good & the springs not weak or the gaskets hasn't gotten hard. Also while you were flushing the system did you take out the thermostat & check it to see if it's good as well?


Supporting Member
Apr 6, 2010
phoenix, Arizona
Is the coolant reservoir overflowing after the drive? Bubbles coming up?

Do you smell something sweet after a drive coming from the exhaust?

The above questions are more than likely due to a bad headgasket. Otherwise check the thermostat, make sure the fans come on, and keep an eye on the temp gauge.
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