hocbj23
+1y
If u r blowing 40 degree air,your compressor and dryer are ok,and so are you feed lines.You need to be checking 1.your blower motor inside the cab,2.the distribution ducts to be sure they are all connected,and the inside /outside dash control that lets u choose inside versus outside air which has the "flapper valve on it mentioned above.Sometimes insulation drops down around the fan motor blades and keeps it from attaining proper speed.A lot of times the distribution ducts will come loose and your feet are freezing and nothing is coming from the vents.Finally the flapper valve may be directing air in the wrong places.BJ