Re: Heater Issues
It will either be the heater core or the heat box door not opening. I think that door is vacuum operated and should be pretty easy to fix. Start the car and let it warm up, turn heat on high for a few minutes and then feel of the 2 heater hoses going into the firewall, if both are hot or real close to same temp then it will rule out the heater core.
Another thing people dont understand is they use a chemical solution to flush out their cooling systems (not saying that you did) which will clean em alright...Where do you think all that rust/gunk goes, it collects in the heater core and the radiator and will sometimes result in a big clog. Radiators can be rodded out but heater cores are pretty much disposable, ther tubes are too small to rod out. Hope this helps.