The item that has me puzzled is you say cold air starts coming out of your
vents (assume you are running the heater) while you see the temperature
jumping up 10 to 50 degrees. You would think if the gauge was accurate and,
your temperature was in fact rising, you would still get warm air out the
vents.
Random thoughts on what might cause your problem: Are you running the
defroster. From what I understand from reading this list, when you have the
air routing through the defroster, the a/c is turned on. Could this be
providing enough cold air to override the heat of the heater core (I fine
that hard to believe). When the temp returns to normal do you get warm air
out of the vents again?
Some have mentioned replacing the thermostat. While I'm a firm believer in
the KISS method of troubleshooting and repairing and what appears to be a
sticky thermostat might solve your problem, I still question why you are
getting cold air out of your heater . From my understanding and experience
with thermostats, if it is stuck open, it will take you longer to get to
operating temperature and those of you in cold climates may never get to
180/90 degree operating temperature (I think, never having lived in a cold
climate, I have no experience how well heaters work). If it is stuck
closed, the car will overheat and the expanded fluid might overfill your
coolant overflow tank.
One other simple item to check would be the pressure cap. I don't know if
it will help your problem, but it is a low cost item that is very simple to
replace.
Not much help, more words than anything else. Keep us posted on what fixes
the problem.
-- Miles Harris III Simi Valley, CA 01 Silver Dakota CC Sport, 2.5L, 5speed 01 Gold Saturn SC1 (3 door coupe) 1.9L SOC, 4speed auto"DML" <bentlejp@yahoo.com> wrote in article <91nufn$ikr$1@twisted.twistedbits.net>... > I've been having an intermittent problem since my tune-up/MSD install with > the truck over heating. ......... > Jayson > 1998 Dodge RAM SS/T - with the special overheating mod. > 2000 Grand Prix GTP/GTX > 1969 Charger > > >
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