Buy cheap get cheap! My Old Air system works great.I'm in the same boat as the OP of this thread. My original climate control has never worked well. In fact it feels that if you operate it at any setting, in the winter it blows colder air than outside, while in the summer it is always warmer than outside air. I've resigned to have the whole system off and just drive with open windows any more.
I've been considering tearing out the old climate control monstrocity box and putting something like this in:
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Informative but far from what needs to be done. He isn't telling you that the dash has to be removed. You have to remove the original plenum so you can plum in the new vent feeds. That is a big job and not easy. The Old Air kit also supplies the compressor mount for an Oldsmobile engine.
I guess depending on the year of the coach. My 77 I did not have to remove the dash....just the complete box from the outside. I used the original ducts and plenum.
I at first just used the original plenum, mine being a 77. But I wasn't happy with air flow. I removed my dash and plumbed the air directly to the vents. 50% increase in air flow. That plenum was killing the flow. Nice installation N2hcky.
76 eleganza? I would not utilize the existing air vents. No proven method to copy that makes it work.
Do you have an image of that under dash AC installed?This past Spring, right before a trip to Mineola, TX for the GMCMI rally, I had a Vintage Air unit added under my dash. I didn't try to do this myself, opting to have my mechanic friend do it instead. He is a wiz with air conditioning and did a great job. Part of this project was to replace the A-6 compressor with a HD Sanden unit. While in there, Jim refurbished the factory AC box and sent the heater core out for e rebuild. The lines are teed into the existing hoses (all new fittings and hoses)
WE just got back yesterday from a 1300+ mile trip from Tucson up to Albuquerque, followed by a loop up in Northern New Mexico, and around to Window Rock, AZ and the Mogollon Rim, finally home through East Metro Phoenix and back home. For probably the first time ever, we were comfortable in the cab in near 100 degree weather. This was without running the Onan and the roof air.
The parts came from Applied GMC, Jim (the mechanic) fabricated all the coolant lines etc and handled the installation for me. NOT cheap, but worth it and maybe a little simpler than starting from scratch with the Old Air unit.
SANDEN 709 CONVERSION KIT
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https://www.gmcrvparts.com/product-p/g11301vuya.htm (similar to this unit but without heat.)
Not particularly. You can't even hear them while driving. They just become part of the overall experience. It DOES blow some cold air though, and plenty of it. It's teed into the factory air system, so both work at the same time.
Not understanding about the existing air vents. My air vent for my air conditioning looks similar to Carls photo except I have just 2 vents that cold air come out. The vents on the dash and side vents on the sides seem only have heat in winter come out of them. So are you meaning those vents?
