temperature gauge only rises when I drive

1998 FORD F-150
203,000 MILES
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CHRSHUCKABY
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can you tell me what would make the temp. gauge rise when i hit the gas but fall when i let off. i have a ford f150 w/ v6 4.2 I can let it idle for ever and it wont run hot. If i drive it once i get over 35 mph the gauge starts going up but when i let off the gas it goes back down.
Nov 28, 2011 at 3:20 PM
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HMAC300
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cold be a bad sender or a bad ground. make sure the coolant level i s full as well.
Nov 28, 2011 at 3:32 PM
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CHRSHUCKABY
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if the sensor is bad, could i just be getting a wrong reading or is the engine really running hot. it never does steam up or boil.
Nov 28, 2011 at 4:00 PM
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HMAC300
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i thinkit would be a wrong reading. some of these sensors if you have the worn gmix of antifreeze screw up their readings. I doubt the engien is running hot , if it was it would be low on power and other indications. The only thing i can think of other than that would be a water pump impeller is slipping on the shaft whe speeding up. you can always manually check your temp while running at idle as well.
Nov 28, 2011 at 4:03 PM
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