2003 mercury mountaineer. Vehicle won't shut off when the hvac unit is on. Can remove key from vehicle and will stay running. Vehicle will shut off when I press the off button on the hvac unit.


Asked by Aug 19, 2014 at 06:18 PM about the 2003 Mercury Mountaineer 4 Dr STD SUV

Question type: Maintenance & Repair

3 Answers


Was this a police vehicle? Does it have "safe idle" (an aftermarket device) installed?


No it wasnt. Found out after alot of testing and troubleshooting that the hvac control unit was back feeding causing the ecm and ignition not to shut down.


Sounds like a nightmare.

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