climate control is wonky - any steps to diagnose

[sipman]

My '07 m coupe sprung a leak (pretty sure it's the door membrane). I'm addressing it, but there's still a bit of moisture in the car.

Might it be this that's causing my climate control to be so wonky?

Today was a high of 58 degrees. I have to set the climate control at 64 or into the first click into the blue to get it so I'm not boiling up. Once out of the sun (shade of a cloud), it begins to feel chilly. Once again in the sun, it's too warm in the car.

I usually would keep the temp at 68 or 69 at most time, but that's far too warm now. When I put it on Max A/C, I get cold air although I haven't taken an infrared thermo meter to it.

My first thought is maybe there's a sun sensor that the climate control uses, but if so, where would it be? Perhaps it's faulty?

Any other steps I should take to diagnose this?

[Huz-Z]

Perhaps a refrigerant recharge for the a/c system could fix this.

[Aloyouis2]

I have discovered that the door in the climate system that controls air intake (outdoor/indoor/Automatic) is wonky. When I change the setting sometimes the car fogs up almost instantly (not on Indoor air). The remedy is to keep changing the setting until the door finds the right spot and outside air is allowed in. Fogged windows go away.

Or, you can just run your AC all the time but that costs 2.5 MPG. Premium is expensive.

[pungo]

There are several sensors used for the hvac system, though AFAIK, none for sun detection.

07 E85 Heating & Air Cond.pdf

[Huz-Z]

Originally Posted by Huz-Z

Perhaps a refrigerant recharge for the a/c system could fix this.

I think this guy has a cool idea!