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Wasn't very hard. Most difficult parts were cutting that big hole in the fire wall (more mental than physical). Also, I wanted the condensor in front of the radiator so I moved the radiator back about 1 inch and modified the hood release so it wouln't hit the condensor. Problem with radiator was then when I had a small fender bender the fan hit the rad. Repair job lasted a year then I had to get new radiator, so if you move rad back then get electric fan and drop the mech drive.
System blows in the 40's. I would get the manual switch over defrost cause with the vac system you cant run AC to defrost which would be nice on very humid days.
I do not have AC in my truck yet, ('63 F-100}...but today I went by the Vintage Air Factory in San Antonia. What they told me is....the best unit to use would be the Elec. blend door unit. Has two defrost ports, and three for vents, plus floor. With this unit you can blend heat/cool, with their vac. unit, you have heat, or cool only. (the elec. unit is shorted by 2 1/2 inches. Also with the elec, you can have air out vents, or floor at the same time. Vents will have to mount in dash, or you will have to make a panel to flaten out the bottom edge of the dash. Have several control panels..a Hor. 4 **** unit, or a hor. 4 lever unit, or a ver. 4 lever unit. Looked good to me. They have a catalog you can order....Salesman said it had enough cooling to cool a pickup here in south Texas..
Can you share with us the cost and particularly the method used to mount the unit. I have been looking at an air-tique unit. But am hesitant because I have never talked to anyone that has installed any of these units. I also have a 66 that I need to make a decision on before it gets hot again. Not as young as I used to be...
I have an Air-Tique indash unit in my '65. They had the lowest prices. I removed the old heater box and bolted this one in its place (had to drill a couple of holes for mounting bolts, but that was all). The truck even had two holes with plugs in them that were just right for the bulkhead a/c fittings - factory air may have used them. A possible disadvantage is that it only recirculates (doesn't have a fresh air input and you need to put a plate over the old air intake hole on the right). My cab is leaky enough that fresh air isn't a problem even with the vent doors closed :P
With an R210 York compressor, tube/fin condenser from a '73 Mercedes diesel and brackets/pulleys from a '65 Bird, I was reading 38 degree vent temps on R-406a (Autofrost).
What air-tique unit are you using. The model I was looking at is UN-109HC. Everything else is from a 75 that I parted out. This great info. Where are you located?
I used a UN-111HC myself. I'm in northwest Maryland so I really only need a/c in July and August. The "King Kool" 109 should work very well for you if it'll fit under the dash. Check the dimensions on their website carefully. You may even want to build a cardboard mockup and make sure it fits where you think it does.
Don't forget to get a new receiver/dryer and unless your hoses look perfect replace them now, it's a lot cheaper than losing your refrigerant!
There is a very useful a/c board at: http://www.ackits.com/cgi-bin/ultimatebb.cgi where many of your questions can be answered.