Hello all,
I have a 2006 Base model Grand Prix. Stock 3800 series 3 motor.
The temperature runs just above quarter when on the expressways but quickly gets up to just over half when idling. The fan then kicks on and it drops back down only to go back up in a few mins.
Additionally when it is cold (first run of the day), as it warms up (expressway driving) the temp gauge slowly gets up to just below half then drops back to just above quarter. Is this normal? I have had it in to the mechanic twice now and he says everything is fine and there are no signs of head gasket or intake gasket.
I replaced the thermostat and nothing has changed.
Any input would be great. Thanks in advance.