As a gm tech at a Chevy dealer i have seen many impala catyletic converters get clogged. Your gm dealer has to warranty a new one if you have less than 80,000 on it
why is my 1995 buick roadmaster running hot
Running the engine hot repeatedly.
I just had this problem on my 2005 Impala. My fix was a new thermostat. I also had the symptom of the engine temp swinging from hot to cold.
Why is my 1995 Corvette running at high temperatures in town, 237or higher?
my o6 chevy impala is lighting up on the dash that the engine is hot but the gauge is saying its cold what is wrong and how can i fix it?
A faulty sensor in the engine block.
I noticed while driving my Impala the temps stays at the normal operating temp but while sitting still the car runs near hot. I don't believe my fans are turning on when they should and if this is the case how do I address it?
it may be the relay switch or a fuse blown check under the hood in fuse box #1 and fuse box #2.
check the coolant temp sensor
try replacing the thermostat. It is probably the easiest fix, as well as cheapest.
If the gauge is reading hot and the car is running normal temperatures, the water temperature sensor needs replaced.