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Is it possible the temp sensor is bad. My wife came home the other day from shopping and I had some errands to run so I grabbed her car. Got a couple miles down the road and the temp gauge was at 3/4. Pulled over and it started to climb, so turned the heat on high(I live in MN so the heat was already on) and it barley moved. Drove home and popped the hood. Noticed the fan was on, but not on high. Felt the cap, ice cold. Weird I thought. Let the car run with my hand on the cap, never got hot enough to take off before the fan came on. To make a long story short, I got a new water pump, radiator, thermostat. Guess what, the f***ing problem still happened. Replaced the temp sensor that was replaced 2 weeks before because it just failed, and the temp was normal. I never really messed with a car when its this cold out, but I would of thought the cap would still get hot enough that you couldnt hold the hand there. Guess I was wrong. The thing that probably could have saved me some time was that if I turned the car off and immed turned the key to run not start, so the gauges would come up. The temp gauge wouldnt come to the same position as when the car was running before i turned it off.
Im sure this may have nothing to do with your problem, but please look at the simple things first. Do as I say, not as I do..
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