Check your coolant level in the radiator first (careful when it's
hot!). If you don't check it regularly, a wild temp guage pin is the
first sign you're VERY low (ie below the level of the pump). The
radiator may take about a gallon of water at this point (DAMHIK). If
your radiator fluid level is low, the full overflow bottle indicates
an additional problem (a leak in the system, a blockage in the
overflow tube, rad cap malfunction).
If your radiator has enough fluid, you could be looking at a blocked
passageway and a coolant flush may solve your problem. I'd say look
for a potential bad pump, but you should hear it screach, squeal,
etc., particularly if the problem is intermittant. It doesn't seem
like an electrical problem (it's dependant on operating temperature
and the gauge rises gradually), but it could be the sensor itself.
Might try testing/replacing the sensor.
Hope something here helps.
Don in CT
89 Dak Vert 318 NV3500 4x4 (running hot... several cooling issues)
74 Dart Sport 340 (the faster she revs, the cooler she runs... a
beautiful thing)
On 8/28/08, Phillip Batson <pbatson68@yahoo.com> wrote:
>
> This is a weird one, and I'm not sure what is causing it. Here is the scenario:
> Start up until engine is at operating temp is about 3 minutes. After about 3 minutes, the temp climbs past the norm, and proceeds to the max reading on the gauge. I'd say it takes about 15-30 seconds to get there.
> At this point, if I floor it or rev the engine in neutral, or turn off the engine and restart, the temp gauge goes up to the max reading for a second or two, and then drops back to the norm reading in about 3-5 seconds. Then it is rock solid and doesn't ever show any kind of overheat. I never hear any boiling sounds or see steam coming from the engine. The coolant bottle is full.
>
> This leads me to believe something is getting "stuck". I already changed the thermostat thinking it was sticking. But it hasn't fixed it. What else do I need to look at?
>
> Oh, and this isn't my truck, it is a '95 plymouth voyager. :) I was hoping you mechanical wizards might be able to point me in a direction to try and fix this.
>
> Thanks guys!
>
>
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