Ok. had to change the switch out that controls the vent mixers cause the actual owner kept trying to turn it thinking it wasn't going far enough to go to the dash setting. I'm the normal driver of this truck. the mixer for the dash, floor, defrost setting has been finicky for some time but able to find a sweet spot to make the air come from the dash however, not any more. i replaced the switch yesterday and it will still only go to the floor and the defrost. took apart the dash and check all 3 actuators and the one for the vents, and hot/ cold mixers work fine and are turning full range of motion. the one for the fresh air/ recirculate does not work but that should affect the air going to the dash. any ideas why the air still will not make it to the dash?
2001 peterbilt 379 A/C will not go on to dash setting.
Discussion in 'Peterbilt Forum' started by calvinbabb, Jul 23, 2016.
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On mine the actuating arm wore out. The actuator was fine. I rebuilt it with epoxy and its been good.
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It was on the heater box itself. The arm operates the actual flapper door inside the box. The actuator is bolted to the outside of the box.
rachi Thanks this. -
The little arm might be stripped where it screws into actuator
calvinbabb Thanks this. -
OK, took the actuator apart and found that it was not moving full range. Only 25 percent. Large gear cracked so flipped the gear 180* and works fine now. Ordered a new actuator and use this one till the new one comes in.
strollinruss, Klleetrucking and rachi Thank this. -
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