Check the sensor connection at the wiring harness for possible
corrosion causing an intermittent gauge. When the gauge DOES
work, does your A/C as well?
In some newer model vehicles, the A/C will shut off if the engine
gets too hot. Same could apply in your case if the computer doesn't know
engine temp at all, and keeps the A/C off just in case the engine temp was
and it didn't know it.
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