The struggle...is real - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Andy4639 · 02-24-2016, 10:14 PM

As most on here know our trucks are very bad about fogging up the windows in a cold rain. I drive mine pretty much all the time rain are shine.
Here lately I have been thinking about this more. I'm wanting to just disconnect the normal AC switch on the backside where the cable makes contact with it to turn the compressor on and mount a AC switch in the dash above are beside the key switch so I can run the compressor no matter what setting I'm in.

Does anybody know of a thread that this has been done? Seems it would be pretty simple to do right.
Take the leads off the compressor switch now and run to a dash mounted switch that is also lite so you know when it's on. You would turn it off anytime the windows aren't fogging and on when they are.
This is the only thread I have found and it doesn't give anything as far as it will work are not.

http://67-72chevytrucks.com/vboard/s....php?p=7453466

snipescastle2 · 02-25-2016, 09:29 AM

I'd say mount a small micro switch next to the lever arm on the defrost diverter, that should do the trick.....
Ben

**Grumpy old man** · 02-25-2016, 09:37 AM

Time to get another truck ,Your running out of things to do to that one !

Custom 68 · 02-25-2016, 10:17 AM

My friend has his Camaro set up this way. He just mounted a switch in his console. His was done more out of ease to setup.
I think you would want to make sure your fan is on to move air over your evaporator or it will freeze up. You could grab power from your fan switch so it would only be on when the fan was running as a safeguard. Just a thought.

**steelhorse** · 02-25-2016, 10:21 AM

Does the A/C not come on with the defrost? My truck didn't come with A/C so I can't check mine. What about setting it up so that the A/C comes on with the defrost like modern cars.

Davidf · 02-25-2016, 10:33 AM

I would simply wire the new switch in parallel with the existing compressor switch mounted on the evap box. This way, regardless of new/added switch position, the compressor would only activate if the blower switch is on. Also, the original switch would still work as intended if the added switch was in the off position. All you are really trying to do is over-ride the off or open position of the factory plunger switch.

72MARIO · 02-25-2016, 03:26 PM

That is exactly what the old air tech told me to do to fix my suburban from completely filling with fog. Glad i got a answer finially

kehstr · 02-25-2016, 05:19 PM

i want to do the same thing, subscribed to watch what you do

Andy4639 · 02-29-2016, 01:47 AM

Thanks for the replies guy's, sorry been at the beach all weekend with no internet. I'm going to take the wires loose of the factory plunger switch and just have a hand held switch to test with and see if it works like I want it to. If it does then I will hard mount it.
Yes the only time it can be on is when the fan switch is on. That's how it works now.

Andy4639 · 03-05-2016, 12:51 AM

Well I got it done tonight! Now to wait to see if it helps in the rain next time I'm driving it.

02-24-2016, 10:14 PM	#1
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	The struggle...is real As most on here know our trucks are very bad about fogging up the windows in a cold rain. I drive mine pretty much all the time rain are shine. Here lately I have been thinking about this more. I'm wanting to just disconnect the normal AC switch on the backside where the cable makes contact with it to turn the compressor on and mount a AC switch in the dash above are beside the key switch so I can run the compressor no matter what setting I'm in. Does anybody know of a thread that this has been done? Seems it would be pretty simple to do right. Take the leads off the compressor switch now and run to a dash mounted switch that is also lite so you know when it's on. You would turn it off anytime the windows aren't fogging and on when they are. This is the only thread I have found and it doesn't give anything as far as it will work are not. http://67-72chevytrucks.com/vboard/s....php?p=7453466 __________________ 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.

02-25-2016, 09:29 AM	#2
snipescastle2 Registered User Join Date: Mar 2009 Location: WARRENSBURG,MISSOURI,64093 Posts: 1,518	Re: The struggle...is real I'd say mount a small micro switch next to the lever arm on the defrost diverter, that should do the trick..... Ben

02-25-2016, 09:37 AM	#3
Grumpy old man Senior Member Join Date: Dec 2013 Location: Gods country East,Tn Posts: 8,545	Re: The struggle...is real Time to get another truck ,Your running out of things to do to that one ! __________________ 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop

02-25-2016, 10:17 AM	#4
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	Re: The struggle...is real My friend has his Camaro set up this way. He just mounted a switch in his console. His was done more out of ease to setup. I think you would want to make sure your fan is on to move air over your evaporator or it will freeze up. You could grab power from your fan switch so it would only be on when the fan was running as a safeguard. Just a thought. __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

02-25-2016, 10:21 AM	#5
steelhorse Senior Member Join Date: Apr 2008 Location: Franklinton NC Posts: 1,309	Re: The struggle...is real Does the A/C not come on with the defrost? My truck didn't come with A/C so I can't check mine. What about setting it up so that the A/C comes on with the defrost like modern cars.

02-25-2016, 10:33 AM	#6
Davidf Registered User Join Date: Nov 2014 Location: Austin Posts: 749	Re: The struggle...is real I would simply wire the new switch in parallel with the existing compressor switch mounted on the evap box. This way, regardless of new/added switch position, the compressor would only activate if the blower switch is on. Also, the original switch would still work as intended if the added switch was in the off position. All you are really trying to do is over-ride the off or open position of the factory plunger switch.

02-25-2016, 03:26 PM	#7
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	Re: The struggle...is real That is exactly what the old air tech told me to do to fix my suburban from completely filling with fog. Glad i got a answer finially __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

02-25-2016, 05:19 PM	#8
kehstr Registered User Join Date: Mar 2015 Location: Utah Posts: 750	Re: The struggle...is real i want to do the same thing, subscribed to watch what you do

02-29-2016, 01:47 AM	#9
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: The struggle...is real Thanks for the replies guy's, sorry been at the beach all weekend with no internet. I'm going to take the wires loose of the factory plunger switch and just have a hand held switch to test with and see if it works like I want it to. If it does then I will hard mount it. Yes the only time it can be on is when the fan switch is on. That's how it works now. __________________ 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.

03-05-2016, 12:51 AM	#10
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: The struggle...is real Well I got it done tonight! Now to wait to see if it helps in the rain next time I'm driving it. __________________ 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.

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