Question about 1991 Chevrolet C1500

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Engine temperature reading high

At normal operating engine temperature, gauge in cab reads high.
the following have been replaced in the last 7 months:
serpentine belt, thermostat, engine coolant, radiator hoses.

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  • Mike Butler
    Mike Butler May 11, 2010

    When did it begin to run hotter? Did you by any chance stop & have the actual coolant temperature checked with a digital thermometer or infrared gun to confirm running temperature? Do you get any different smells of oil burning etc, that lead you to believe it is running hotter ?

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Faulty temperature sensor I think, thats what feeds the gauge. If the vehicle is genuinely running hot there would be a lot of pressure in your radiator causing overflows/steam/coolant smell.
Those sensos wear out and commonly go to short which shows a higher & higher reading until they fully short out
...hope that helps.

Posted on Jan 09, 2009

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My a.c is not cooling i put freon in and my compressor will only come on every now an then i replaced the switch in the dash but still did not help i did use a jumper wire to my compressor and it...


You may not have enough R134a in the system, or you have over charged the system and your high pressure switch is turning your compressor off when the pressure get's to high.
You really need a A/C gauge set to see of your system is over or under charge. If it's under charge, that's good. A over charged system will cause your a costly repair of replacing a $300.00 rebuilt compressor plus the vacuuming out the system and replacing the accumulator which may have parts from the compressor (bearing).
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Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor, assuming the blower speed is on high, AC is set on maximum and engine is around 2,000 RPM’s

1. Check the high and low gauge readings with the AC on & set on MAX/Recirculate, middle vents with the engine at 2,000 RPM’s, blower speed on high.
2. Check the vent temperatures with a thermometer from the middle vents, far right & far left vents?
3. What is the outside temperature at the time the readings were taken? 4. Check to see if the condenser fan blowing strong?
5. Notice if compressor clutch is cylcling excessively.



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