Engine Size: 5.0
Refrigerant Type: 134
Country of Origin: United States
a/c works great, but when i accelerate or climb a grade the vents close, and then open back up after i get off it. the a/c is running the vents just close. please help a/c shop wants 250.00 to diagnose.....
The vent doors are operated by engine manifold vacuum. When you open the throttle wide, vacuum available from the engine decreases. There is a check valve and a reservoir tank under the hood to hold vacuum for the vent controls during this time. If the check valve is bad or there is a leak in the vacuum system beyond the check valve (the control panel or the vent dampers, etc), it will do what yours does.
We've updated our forums!
Click here to visit the new forum
Copyright © 2016 Arizona Mobile Air Inc.