93 Buick Roadmaster, 5.7L, 140K miles. Car runs like a top, no leaks or noises. The temperature gauge on the dash will heat up to the normal 10 o'clock position and stop there for a couple minutes. Then it slowly climbs all the way (pegs somtimes) up over about a minute of driving. Then it immediately (3 or 4 seconds) goes back down to normal. It keeps doing this until the car is shut off. High speed, lo speed, or idling does not seem to have an effect. The car does not appear to be overheating, no boilovers, no sevice engine lights, nothing. I've driven like this for a couple thousand miles with no ill effects. Change the temp sensor in the head, radiator, fan, thermostat (even tried removing thermostat), flushed system; absolutely no effect. What's up?
have the same problem?
Saturday, February 3rd, 2007 AT 11:42 AM