I've been having an intermittent problem since my tune-up/MSD install with
the truck over heating. The problem has gotten progressively worse until
now it does it virtually every time you drive the truck. The truck comes up
to operating temperature, heat blowing out, then all of a sudden the air
coming out of the vents gets cold and the temp gauge starts going up. It
may go up 10 degrees, it may go up 50 and trigger the check gauges light.
Then all of a sudden something switches, and the temperature falls back to
normal. The thing that really confuses me is that the gauge does these wild
temperature swings really quickly (like 1 min or less from one extreme to
another). My first thought is that the thermostat needs to be replaced, but
I've never seen a vehicle do this. The last time I needed a thermostat it
was because the vehicle never wanted to put out any heat, but it never
overheated. Could it be the water pump? The temp seems most likely to go
back down when RPMs are up a little, not when sitting an idling. Could it
some how relate to the tune up / MSD install? I can't imagine what that
could be, but that's about the time it started. I am planning to change out
the thermostat and replace all the coolant in the next day or two as my
first attempt to fix this, but I'd like a second opinion before I start
changing things. Thanks once again to all who have any suggestions.
Jayson
1998 Dodge RAM SS/T - with the special overheating mod.
2000 Grand Prix GTP/GTX
1969 Charger
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