HVAC control temp issues

ID Status Date Year Make Model Transmission Type A/C Controls Public/Private
#14238 Closed 2011 GMC Yukon public

I’m having temperature issues. I tried the reset of the HVAC controls. No matter what setting I change to air only blows from the main dash vents. Will not move to defrost or floor. I also have no hot air coming out. Just starting to trouble shoot. Will check coolant levels and heater hose temperature. I’m not sure if it’s a control issue, actuator door issue, temp sensor issue. Where should I start?


Unfortunately you should start with a scan tool capable of accessing the HVAC system. Beyond that the mode actuator is probably at  fault and should be replaced.

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