Vehicle: 2000 Dodge Durango, 4WD, V8-4.7L, VIN N, Automatic Transmission
Mileage: 148,667
Problem: The vehicle was brought to the shop because the HVAC would only blow though the floor vents. The problem had started a few days prior, and seemed to start happening overnight.
Details: The tech connected a scan tool but didn’t find any DTCs in any modules. He noted that the HVAC system seemed to operate as designed, except when switched to the vent mode. Then it only blew air from the floor vents.
He checked the vacuum source to the HVAC control head; it was okay. He also checked every vacuum hose at the control head; they appeared to be connected correctly and not leaking. At this point he called Tech-Assist.
The Tech-Assist consultant suggested checking downstream from the HVAC control panel for possible vacuum leaks in the lines to the door actuators and checking the actuators themselves for leaks. The tech checked for leaks at the mode & blend door actuators with a hand-held vacuum pump and found the mode door actuator was leaking.
Confirmed Repair: He replaced the mode door actuator and verified that air was blowing through the appropriate vents in each mode and the HVAC system was working as designed. Fixed!
The ALLDATA Tech-Assist team fields cases like this every day. See how Tech-Assist can help your shop save time and money with on-call diagnostic support from ASE-certified Master Technicians. More Tech Tips
Not an ALLDATA customer? For access to this valuable experience-based repair data and reliable OEM information, start a free trial today.
If you would like to read more articles like this one please subscribe to ALLDATA News.