2010 GMC Sierra overheating
Morning everyone I have a GMC Sierra 1500 and
I'm having an issue with overheating that I can't
figure out, It will run at the normal operating temp
but in heavy traffic or an idle it will start to get hot,
however once I start to drive down the highway it
will cool down to the normal range. I have replaced
the Thermostat thinking that was the issuse and
still had no luck also the day after I changed the
thermostat and refilled the coolant to the fill line I
noticed it was running a little below the fill line
however I have checked and had my mechanic
check for leaks and we have found nothing any
thoughts??