View Full Version : 1997 Catera Heater Problems

11-11-06, 11:23 PM
I have a 1997 catera with heater problems. I have taken all the cowling from over the HCV and it seems like the hoses coming from the small pump on the passenger fender are spongy and not full going to the heater core. I made a 3 way maifold so to by pass the solenoids and get straight vaccum to the box on the cabin air filter and the HCV. Don't know exactly how the system works, but it seems that there is a small pump pumping the antifreeze through the heater core. Have checked and it is receiving 12 volts and I can feel it vibrating, like it is working. Is it possible that it has a air block? Or lost its prime? Could the HCV be bad? Any suggestions would be greatly appreciated, its getting a little cool driving