1994 Geo Prizm 4 cyl Two Wheel Drive Automatic 212000 miles
I recently installed a new head with all new hoses, thermostat, radiator etc. Before the heater would not heat at engine idle. Worked ok on the road. Now it doesn't heat at all. I checked the input and output ports on the firewall. I do have hot water going into the heater core and returning. I also tried running water both ways thru the heater core with a garden hose. It runs thru clear and clean. There are no leaks at all. Any idea what might be the problem? Your thoughts will be greatly appreciated.
Wednesday, November 10th, 2010 AT 11:48 AM