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Andy4639 · 01-23-2016, 03:11 PM

Ok lets see if this helps.
In the picture I posted the far left is defrost outlets. The next section is just a piece of plastic, is no more than a union if you will, then the next piece is the diverter that you need to check and see it it's working. This piece directs the air to the sides and center vents for AC. I would suggest taking the other pieces off and seeing if it's working.

Now for the vacuum lines you need a port off the engine which in your picture I don't see. It will tie to the vacuum resevoir in the picture that should be mounted on the box under the hood which like I said I don't see it.
The vacuum control head should be on the controller in the dash.

01-23-2016, 03:11 PM	#4
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: 72 A/C K20 no defrost help request Ok lets see if this helps. In the picture I posted the far left is defrost outlets. The next section is just a piece of plastic, is no more than a union if you will, then the next piece is the diverter that you need to check and see it it's working. This piece directs the air to the sides and center vents for AC. I would suggest taking the other pieces off and seeing if it's working. Now for the vacuum lines you need a port off the engine which in your picture I don't see. It will tie to the vacuum resevoir in the picture that should be mounted on the box under the hood which like I said I don't see it. The vacuum control head should be on the controller in the dash. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.