Location A/C clutch relay needed?

IVO STIERLI

MEMBER
2004 LINCOLN NAVIGATOR
5.4L
V8
4WD
AUTOMATIC
100,000 MILES

A/C is not working, warm air. A/C clutch wheel is not spinning. Where do I find the A/C clutch relay to check it?

Sunday, July 20th, 2025 AT 1:57 AM

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

I need to say if the A/C system is low on refrigerant, it will not activate the relay. Here is a video to help you check:

https://www.youtube.com/watch?v=uZrQCGwXfek

and

https://www.youtube.com/watch?v=ON2dYcmXIAw

Here is the A/C clutch relay as requested, the relay is located in the #1 relay box under the hood. Check out the images (below). Please let us know what happens.

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Sunday, July 20th, 2025 AT 11:33 AM

IVO STIERLI

MEMBER
3 POSTS

Thank you, Ken. The refrigerant is okay, but I have a problem finding the box with the A/C clutch relay. Where in the motor compartment is this auxiliary relay box?

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Monday, July 21st, 2025 AT 8:00 AM

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

It is on the left side of the engine compartment. Check out the images (below).

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Monday, July 21st, 2025 AT 10:26 AM

IVO STIERLI

MEMBER
3 POSTS

Thanks again Ken. I found it under the air tubes, and it is not clicking.

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Tuesday, July 22nd, 2025 AT 3:00 AM

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

Does the other functions of the HVAC system work? If so, I would bypass the low side pressure switch to see if the compressor clicks on, the location of the switch is on the low side AC line, it should have two wires, jump them together with the system on and the engine running. Also, have you checked the fuses for the compressor which is the fuse # f33 in the fuse panel on the right kick panel. Please let me know.

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Tuesday, July 22nd, 2025 AT 11:25 AM