Vent Stuck in defrost and no heat

[Bill Boggs]

It doesn't matter whether I am in foot, middle or defrost, the air is coming our of the window defrost vents. AC on or off, full cold or full hot it doesn't matter. All I have is cold air coming out of the window defrost vents. I also noted a couple of months ago the heat started acting up.

Can anyone advise? I have tried going on the internet but cannot get a answer that I can believe. Some people talk about an electrical problem with a mixing valve and others talk about a vacuum leak. Both scenarios call for opening up the dash. It sure would be nice to have a plan that I have some faith in!

Thank you in advance for any ideas and advice.....

 

[Tremper126]

I would guess a blend door motor issue, along with an actuator slip. Do you have single selector or dual climate control?

 

[Bill Boggs]

It is the single AC with the pushbutton soft key controls

If I need to look at the actuator doors is there any way to troubleshoot without doing swaptronics. Any Utube videos about opening up the dash?

 

[Colby]

My 2018 does the same thing. I have replaced the actuator and heater control module in glove box. The system restarts itself every time I start the truck. I have also replaced a solenoid looking thing under the truck due to the fact that's what the dealer said it was. The actuator does however move when it is trying to calibrate. I have the AlfaOBD and it says that actuator is failing? It does move though but then goes into the default defrost every time. I am at a loss on what it is. Was thinking it might be the touch screen or head unit?

The dash is really easy to take apart to get to the actuator you are needing to get to, depending on the year of your truck?

 

[Bill Boggs]

Thank you Colby for sharing. Did you buy a service manual or some combination of winging it and utube?

 

[Colby]

I just winged, YouTube and stealership.

 

[Bill Boggs]

There are a few people with bad reviews of aftermarket actuator doors. I am considering paying for OEM parts. That and if I can find a service manual would be nice.

Hope you have a great day!