No Power to A/C Clutch?

BBHEPP

MEMBER
2017 CHEVROLET SUBURBAN
5.3L
V8
4WD
AUTOMATIC
110,000 MILES

I am not getting power to the AC clutch. I can't find a wiring schematic to figure out if it's the temperature control module or something else. There is no relay for this year.

Thursday, April 13th, 2023 AT 11:18 AM

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,709 POSTS

Hi,

I attached the entire wiring schematic for the AC circuit below, so you have it as a reference.

I read through the schematics, and it does show an AC clutch relay in the under-hood fuse box. It is actuated by fuse 60 which I can locate in the pics. However, they didn't indicate the relay location or number.

In most cases, the relay is located close to the fuse. Take a look at the pics below and let me know if they help.

Take care and let me know what you find.

Joe

See pics below.

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Thursday, April 13th, 2023 AT 7:50 PM

BBHEPP

MEMBER
3 POSTS

I've checked the fuse and it is good. I've read that the AC Compressor Clutch Relay should go in location 29 Uplifter 2 Relay, but this vehicle never had a relay there. I can't find any mention of or location for the Engine Controls Ignition Relay. Could the ECU be going bad? Any Ideas?
Thank You

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Friday, April 14th, 2023 AT 11:57 AM

JACOBANDNICKOLAS

MECHANIC
109,709 POSTS

Hi,

You are correct about the relay location. I looked up the uplifter 2 relay. It is for police provisions. See pic 1 below. When I follow the power supply back, it takes me to multiple things but nothing with the AC.

I believe engine controls (ECM) and ignition are the two I highlighted in pic 2 below. Take a look and let me know if that is what you are seeing.

Take care,

Joe

See pics below.

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Friday, April 14th, 2023 AT 7:17 PM

BBHEPP

MEMBER
3 POSTS

I checked all the fuses and relays in the engine compartment, they all came back good. I also did a wire trace from the ac clutch and the only place I got good tone in the fuse box was at TP1 shown in the photo. At this point I am lost and don’t know where to go from here.
Thank you

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Saturday, April 15th, 2023 AT 7:04 AM

JACOBANDNICKOLAS

MECHANIC
109,709 POSTS

Hi,

It took me an hour, but I finally was able to determine why you can't find the relay. It is integral to a printed circuit board in the fuse box. See pic 1. According to my findings, it is not serviceable.

I suspect the box will need to be replaced. I attached diagnostics below that require a bi-directional scan tool to perform.

Take a look and let me know your thoughts.

Take care,

Joe

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