I replaced my thermostat, my water pump, my ,and my engine still overheats. on 2005 Chevrolet Malibu

is it possible I might have a blockage in my heater core,cause there's no heat blowing from the fan.

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3 answers 3 comments
Overheating and no hot air from heater are both tell tale signs of LOW COOLANT.
it has plenty of coolant, what else might be the problem.. I really don't know, its got the right thermostat, and the dex tro coolant.
IF, IF it is FULL of coolant and radiator fan(s) are working, it is possible a head gasket may be defective! Repair shop can do a combustion leak test to confirm or refute.
also could be faulty water pump,Have seen a few cases where the impeller comes disconnected from the shaft..if compression is ok as pushrod stated need to confirm that the pump is circulating the coolant propperly
Feel the the inlet and outlet pipes to the heater core. If the inlet is a lot warmer than the outlet, the heater core could be plugged. (Careful not to burn yourself!)
POSS BLOCKAGE IN RADIATOR OR COOLING FANS ARE NOT WORKING PROPERLY