I have a 2008 chevy impala ss & it keep overheating i change the thermostat rely 2 the fan & got a diagnostic from the dealership, they nothing wrong then it overheats again, can u help me?
I see you replaced the fan relays but are the fans actually coming on ? If so flush cooling system with Prestone Super Radiator and Cooling System Flush just follow directions on product.
My 2008 Impala SS was overheating. At first I top off the resirvoir with coolant. He still overheated. I parked it and waited to move it until the next day to minimize engine damage. I drove it home the next morning and it overheated again. I later found out that the radiator cap was damaged bad and I was losing coolant. I identified the area of the leak. There was a leakage located bottom passenger side of the radiator. I went to the auto parts store and bought a new cap and a thermostat(based on my google experience) and a bottle of radiator stop leak. No luck. My SS kept overheating. I gave in and took it to the nearest radiator shop. Come to find out there was a crack in the plastic on the radiator tank. I had to get a new radiator and a thermostat housing. Not just the thermostat. New coolant. And like magic....no more over heating. See attached pic
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