I need help tracking down or diagnosing a heating problem If I have the Rotary dial set at Max heat, and the EC button depressed, I get a bit of heat from the bottom vents, If I select either full defrost or the complete up and down setting it blows mostly cold air. Could this be the control unit? Is there a simple troubleshooting procedure that I could use to eliminate possible causes one at a time? This problem seems to be intermittent along with the high pithed squeal that I have been hearing
Any help or pointers are very much appreciated