03 tahoe climate control not working

[MattDRN]

I have an 03 tahoe LT, the front climate control only blows warm air if the temp is set to 90, other than that it is ice cold air. It doesnt matter if on auto or manual, or what the fan speed is. Any sugestions?

 

[clkelley]

Welcome to the neighborhood!

It sounds like a mode actuator under the dash isn't allowing the climate control to work properly. Although it is possible that the climate control module itself is the culprit, it is more often than not an issue with a mode actuator under the dash that has broken a hing and isn't working properly.

 

[MattDRN]

thank you for your response!, I will check the actuator this weekend. I assume it is the one in the hvac box under passenger side dash. I actually just bought the truck a week ago today and now I am finding all sorts of oddities like when I put the left directional on, it will flash the four ways instead, and the right turn one only does the right side. Last night I found that when hooked up to a trailer the lights are very dim, I was thinking a bad ground could cause that. But I also just figured out my DIC buttons on the steering wheel are not working. The radio control buttons work, just not the dic. would you know of any chance all of this is related or am I looking for individual problems? The previous owner replaced the alternator (had a shop do it) about a month before selling it to me.

 

[clkelley]

They may be related, but for the turn signals, that is more than likely an issue with the switch itself in the steering column. I would first check under the dash, etc and throughout the truck for any and all possible wiring issues to rule that out first.