Climate Control Issues

[Blade9759]

I'm having an issue when using the climate control. On longer trips, using automatic climate control, the cabin reaches its desired temperature. But after about 20-30 minutes after being at the desired temp, the driver's side vents (middle left and far left) start blowing out room (ish) temperature air. (In the summer using the air conditioning it will start to blow out warm air, and in the winter, it will blow out cool air.) This happens whether or not I use the air conditioner. This is an odd issue, because it only happens to the driver's side and not the passengers side vents.

Today I had to drive for 3+ hours to go somewhere. It was hot outside, I set the cabin temp to 68 on AUTO. The pass. side was synced to the driver's side. The cabin got down to 68, and then after about 20ish minutes my side started blowing warm air. And it will keep doing that unless you intervene. Lowering the temp to 67, 66, or all the way down to 60 changed nothing. Putting it on LO bypasses the temp sensor and just goes full cold. This issue is really annoying because sometimes putting it on LO won't get the a/c blow cold it just runs the blower motor up.

The cause of this problem could be a number of things. Servo motor, interior temp. sensors, climate control panel, low freon level, or something else. I replaced both interior temp thermistors behind the radio and that hasn't changed anything. If anyone thinks they know why this is happening, please reply. Cheers.

[Zolli]

My guess is the blend control doors are either failing or shorting out, causing the air ducted into the cabin to be so screwy.

[RPMtech147]

Before I'd go any further, verify the correct charge. If charge is good, press on your diag. A less than full charge will cause a temp difference from left to right. I can only assume a slightly low charge would cause an issue such as yours.

[Audibot]

Scan the car?

[Blade9759]

Before I'd go any further, verify the correct charge. If charge is good, press on your diag. A less than full charge will cause a temp difference from left to right. I can only assume a slightly low charge would cause an issue such as yours.

I'm gonna get the level checked but this issue happens in the winter too when I'm not running the air conditioner.

[Blade9759]

Scan the car?

I did and nothing came up.

[Blade9759]

My guess is the blend control doors are either failing or shorting out, causing the air ducted into the cabin to be so screwy.

That's what I'm thinking, a blend door that is upstream. I wish I could find a diagram on all these servos and what they do.

[Theiceman]

Vcds should be able to do an output test on them all. I've done it.

Sent from my SM-G973W using Audizine Forum mobile app

[Blade9759]

Vcds should be able to do an output test on them all. I've done it.

Sent from my SM-G973W using Audizine Forum mobile app

Hopefully that will find the servo motor that isn't feeling good? I have to find someone who has vcds and knows what they are doing tho.

[Zolli]

You’ll probably end up finding a ground wire that’s loose, which could be why it’s sometimes fine, sometimes wrong.