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Jeep TJ A/C Control Head [message #366165] Sun, 15 August 2021 19:36 Go to previous message
Greg C. is currently offline  Greg C.   United States
Messages: 224
Registered: October 2019
Location: Knoxville, TN
Karma:
Senior Member
Today I finished the rough installation of the all the wiring and vacuum lines from the new Jeep control head to the GMC. I had labeled all wires in the dash and on the control, and cut the GM plugs off the wiring going to the stock HVAC panel and used male/female connectors to hook up the Jeep panel.
The Jeep head uses vacuum lines that are the same size in diameter as the GMC. Not knowing how else to connect them, I drilled .250 aluminum rod with a .136 number drill and made female to female adapters. I carefully coated the vacuum lines with RTV, avoiding the ends to prevent clogs, and slid the GMC lines into one end and the Jeep lines into the other. The lines fit snugly into the adapters, but I wanted to minimize leaks, so I glued them in. The Jeep control came with a vacuum pigtail, and I got the chassis end of the pigtail from a wrecked TJ. This way the vacuum lines can still be separated at the pigtail plug.
Once done, I fired up the engine for a vacuum source and began testing the vacuum operation. Everything seems to work pretty good. A turn of the knob, and different modes were selected and the various air doors operated as they should.
I used a blend door actuator from the Jeep on the old cable push pull temp door. It works great. You can turn the temp knob from blue to red and watch the temp door cycle up and down.
I uploaded some pictures on the photo site, here: http://www.gmcmhphotos.com/photos/g7367-interior.html

I tried uploading a video of everything working, but was unable to do so. That's unfortunate, because you can really see the air doors moving in response to the mode knob.

Also, the blower fan DOES NOT run on low all the time now, if the Jeep control ( guess it's now a GMC control, or just A/C control) is turned OFF. This shuts off the blower fan completely. Also, the Jeep control head has built in lighting which I connected to the coach. It will dim with the rest of the instrument lighting.

I need to tweak the defrost door actuator a little bit, but overall, I am very happy with the outcome.

Greg Crawford KM4ZCR Knoxville, TN "Ruby Sue" 1977 Royale Rear Bath 403 Engine American Eagle Wheels Early Version Alex Sirum Quad bags

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