Originally Posted by jrafols
since last week, my engine temp gauge has been fluctuating from 100 to 210. It makes be believe the a sensor might be loose somewhere because it will read correct for the first 5 minutes when I start the car but after that it goes back down to 100. If I hit a bump on the road the gauge goes up to 210 and then back to 100. Any ideas?
I think it's just a cruddy connector. Did you open the hood and check the connector on the coolant temperature sensor? I believe it is the connector as the sensor would make the gauge rise or fall slowly, because the sensor resistance rises as the heat rises and I don't believe it would just drop or rise, fast.
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