car overheating 2001 Cadillac Deville Dts?

Hello!

New member
my 2001 Cadillac Deville Dts keeps overheating. I have new headgaskets, new radiator, new water pump, new thermostat, new Reservoir tank with new cap, Full on coolant. My car is still overheating and I can't figure out what the problem is! Any ideas?
it over heats when it is idling, not only when I'm driving.
 
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