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1997 buick century 3.1, temperature gage says overheating, lose heat in car, turn it off and wait 15 to 20 minutes, start it up, heat works and temperature goes just above half. Changed out radiator cap, water pump, thermostat, large heater hose within last two weeks and it's still giving high temperature indications. Does not appear to be actually overheating. Also have no milage or gear indications on instrument panel. Could it be the instrument panel cluster? Can I swap it with another junk yard cluster?
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Snds like you need to be checking for the beginnings of a weak of leaking head gasket. Ensure the fans are operating correctly however, those engines are notorious for their head gasket failures
Before you did any repairs to address your overheating problem, did you check to see if your fans were working at all ? One way to check if they are working is by starting your vehicle and turning the A/C on, they should automatically start running. If they do not, begin to perform diagnosis to that electric circuit.
I just had a similar issue with my 1995 Buick century. My issue started out with the gage being almost pegged with the car off. When I turned the key to run it pegged the gage completely. I first called AutoZone and they told me it was either the temperature sensor, thermostat, or gage. I knew that my thermostat wasn’t bad because I replaced it a while back. I then checked my sensor; I unhooked the two pin connector of this sensor at the block and suspected the needle to drop to zero. This was not the case. I then checked my wires using a multimeter to verify that there was no short at my firewall. My wiring was fine. I then called a family mechanic and he instructed me that there is also a "temperature switch" that also is interconnected to the coolant temperature gage. I then found this switch which was threaded into the block near the firewall of my car. I unhooked the 2 pin connector and suspected that the gage would return to the neutral position. And sure enough it did!! This could have been a heck of a lot easier if AutoZone could have told me that my car has a "temperature switch". But non the less it was only a $15 fix! First try unhooking your sensors and switch to see if this is the problem, I would lastly suspect your gage to fail! Good Luck
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