ot a/c and air question '88 gmc

ericlb

Well-known Member
i got a 88 gmc 1500 ext cab,ever since ive had it the air only comes out on the floor and a small amount thru the defrost nothing on the dash vents, i finally pulled the dash out of it on the passengers side the blend doors seem to be working, anybody had this? where should i look next id be happy evev if everything came out the dash vents only it wasnt too bad in winter but its getting hot now and a/c sure would be nice
 
That system is ALL electric servos and doesn"t even have a vacuum connection to the intake manifold.
 
There's 3 servos, You would be looking at the "mode door actuator", #8.

<img src = "http://ww2.justanswer.com/uploads/therock500/2011-02-20_070356_94_hvac_mode_recirc_door.gif">

Is it operating properly? Also, the door could be broken loose from it's shaft or the rubber sealing lip around the door could have rotted or fallen off. Could even be a defective control "head" not sending a signal to the servo.
 
thanks bob,number 8 is one i missed all the others seem to be working that had me stumped and your right there is no vacuum to the thing
 

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