2000 Impala Heater not working

[jayjay09]

I have a 2000 3.4 Impala my heater doesn't come on till the car gets warmed up and only if I'm going 65 mph or over, but if I turn the fan on it goes cold. Also fan blower doesn't come on except if it's on high. Even then it blows cold air.

[Airjer_]

Does the temp gauge read normal?

is the check engine light on?

Is the coolant full?

The fan only working on high is likely a bad blower motor resistor

[jayjay09]

The coolant is full. The temp gauge reads high sometimes and the low coolant light comes on when it goes high.The check engine light is not on.

[Iflylow]

Sounds like you have air in the system. Bleed it out and see if that helps.