: 2000 Catera heater not working

01-04-10, 02:19 PM
I have a 2000 Catera with a non-working heater. The car will blow cold air through all modes of heat but will not actually heat the air. I am trying to figure out if it is the heater core or if there is another reason for this.

Is it possible that the heater control valve is bad?

I had previously installed a new auxillary water pump after the last one went out and thought that would solve the problem but it did not. It appears that fluids are not getting through the heater core.

Any input? Thanks for you help.

01-06-10, 03:55 PM
Not sure about the bypass valve. I think they usually leak when they go bad. But mine did this and a coolant flush from a mechanic fixed it. It was like $30. I brought it in to have the heater core changed ($900) but they flushed it first thank goodness.