Air conditioning

Tiny
REYDELEON1
  • MEMBER
  • 2016 FORD EXPEDITION
  • 2WD
  • AUTOMATIC
  • 41,000 MILES
The A/C only works in the lower fan speeds. When I put it on Max A/C it turns on for about five seconds then shuts off. I have already replaced the resistor twice and the blower motor.
Wednesday, July 25th, 2018 AT 9:37 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi and thanks for using 2CarPros.com.

Since you have already replaced the two components that are common problems, I need to know if you replaced the blower motor relay. I have attached a wiring schematic for you to review. If the relay can't handle the load, it may be turning off.

Here is a link which describes how to test a relay:

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

There are five pictures attached. The first is simply the relay location, and the others are the schematic from the relay directly to the blower motor and the entire wiring schematic for this system. They fall together in the order I have attached them. Take a look and let me know if you have questions.

I hope this helps. Let me know if you have other questions or need additional help.

Cheers,
Joe
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Thursday, July 26th, 2018 AT 8:17 PM

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