91 Deville, blows heat out defrost vents but not forward vents. If I turn the climate control down to 60 it starts blowing out the front ducts. I've removed the glove box, but only see 2 silver boxes pretty sure back one is main computer. Could this just be the climate control module or probably the the A/C programmer gone bad. Air is never hot but warm.

Sorry if this is a duplicate post did search the forum for several hours. Any pics of the A/C programmer?

 

I noticed just recently air only comes out front ducts for a short period of time. Air does come out floor, when defrost on air comes out defrost ducts. Originally the outside air temp sensor showed -40f but reseated connection and drove a few miles and displayed correct temp. I think that maybe hot water flow valve may have a issue. Also found mouse nest in engine compartment so they may have gotten into ducts.

Saw on another post that said warm air isn't supposed to come out front ducts?