HVAC Air Flow Switching to Defrost When Acceleratingon Dodge Dynasty

The AC/heater (HVAC) system may unexpectedly switch to the defrost mode when accelerating. This system is operated by engine vacuum and should be inspected for any vacuum leaks if this problem develops.  There is also a revised vacuum check valve available to address this concern.

RepairPal Verified
Average mileage : (–)
4 Years Affected: 1990, 1991, 1992, 1993
4 people reported this problem
0 people shared problem details
Related Items:
Need to locate the idle air control valve to clean it or replace it.
Odors from the AC (HVAC) system may be caused by microbial growth on the AC evaporator. Our te...
An erratic or intermittent rough idle during the first 3 minutes of engine operation my be caus...
A high pitched whistling noise from the engine may be caused by the idle air control motor. Our...
When you put the key into the ignition, you can turn it and hear a slight click, but the car wo...

Related Content