HVAC Temperature Goes Full Hot When One Click Off Full Cold - keywords a/c ac actuator air compressor control door head heat heater mode

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Some customers may complain that the temperature will go to full hot when they turn the temperature control one click off of full cold. The control head is defaulting to Emergency Mode (this provides HOT air to clear the windshield in Defrost mode). This will happen if the feedback voltage for the air temperature actuators are out of range.

Locally obtain a 60 to 68 ohm 1/2 watt resistor, and install it in-line in circuit 1688 pin F of the HVAC control head. Install the resistor just behind the HVAC control head.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.