The car was bought back in the summer and the heater blew hot air. Now that it's cold and time to use the heater it's not working.
I have checked fuses and all are fine. AC works, heater blower works, but no hot air is coming out. If the car runs for a very long time some warm air will come out.
I have read this newsgroup a bit and heard about a monovalve. Someone also said it could be a thermostat. Could it be a problem with the heater core itself?
The monovalve repair seems to show up pretty often here. Where can I get this part besides websites?