I HAVE A 2000 IMPALA ,AND MINE DID THE SAME THING.I HAD IT CHECKED AND IT WAS THE THERMOSTAT.IT WAS CLOSED,THEREFORE IT WAS NOT ALLOWING ANY COOLANT INTO MY ENGINE,SO I REPLACED IT AND NOW ITS ALL GOOD! ANOTHER POSSIBILITY IS YOUR TEMP SENSOR. HOPEFULLY THIS HELPS.
my heater doesn't work in my 04 Chevy impala. My coolant levels are correct, and this still does not correct the problem. Could it possibly be the coil in the dash. If not what could problem be?
If coolant full could be a bad sensor
Check coolant level Could be a bad tenperature sensor or gauge Could be a bad thermostat not opening to allow coolant flow
a bad head gasket or intake manifold gasket.
Head gasket. Do block test for gases in coolant
Could be a clogged fuel filter, a failing fuel pump, or an intermittent fuel pump relay.
I don't know like 5 maybe 6 could be 7 Possibly 8
if you smell coolant and your windows are fogged possibly it could be the heater core.
Possibly a leak in the coolant reservoir bottle.
It could be that you need coolant or it's low.
First you have to determine the cause. Could be a faulty thermostat, frozen coolant (insufficient mixture of antifreeze), low on coolant or possibly a bad head gasket.
If it's overheating, it cold be thermostat, radiator or possibly other problems. If it's not overheating it could be the coolant level sensor.