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Ventilation system not working

Tiny
TXPROUD
  • MEMBER
  • 2002 MERCURY MOUNTAINEER
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
Was driving and the head unit to the ventilation system (AC and heater) lost power, including the rear AC. I have checked every fuse in the cabin and under the hood and they all seem fine. Am I missing a fuse or relay somewhere?
Wednesday, January 10th, 2018 AT 7:39 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,289 POSTS
Hello,

There are several fuses that run the system and a blower motor relay.
Here are guides to help us find the problem:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check for power at the fuses as well.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Below are the air conditioner wiring diagrams and the fuse panel location see where you are losing power.

Please run this test and get back to us.

Cheers, Ken
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Friday, January 12th, 2018 AT 12:03 PM

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