I just looked up the part number of the Ford fan I run on my 1983 G20 with a small block 406 in it. It is Dorman 620-148 used on the 3.0L V6 Rangers in the 90s. Clockwise rotation, 18" diameter, 12 blades, same 3.25" bolt circle as a GM clutch, same 2.62" mounting diameter where it ce...

I advise staying far away from the highly flammable refrigerants you mention: R-152a, propane, and isobutane. They're very dangerous to work with, present a fire hazard should the system leak, and they're just not worth the risk, in my opinion. As already suggested, R-12 would be best because your ...

Dougflas wrote: ↑Sun Mar 08, 2020 10:11 am If you think R12 is expensive, wait until you price R1234YF. R1234YF is being used on a lot of new vehicles.

R1234YF far outperforms R134a in the vehicles I have been in using it. Instant cold air and sill turn the interior into a meat locker.

My understanding is that the A-6 was not designed to cycle due to its small-diameter clutch, not because of the compressor itself. What say you, GM Tech? I have always heard that myself, however GM and Ford used millions of them in cycling clutch orifice tube systems from the factory and many of th...

Are you going to keep it R-12, or do you intend to convert it to R-134a? if the latter, you'll need to re-calibrate your original POA (STV) valve to the "newer" refrigerant. If your original POA valve is intact and rebuildable, why replace it? Several professional rebuilders with an Inter...

Without re-reading this thread, I don't think we know the make, model, and year of this vehicle and whether it has a TXV or OT. Regardless, it's possible that the charge is "off" and/or that it has a restriction someplace, as suggested earlier. If it's an older vehicle and the A/C system ...

In terms of liquid flow leaving the condenser I do not see the need for anything larger than a #6 myself in that application. GM used a #6 line even in dual evaporator systems without issue. The largest expansion valves and orifice tubes are much smaller in cross section at their metering area than ...

"I have seen a lot of older systems that only have a trinary switch on the reciever dryer" A trinary switch includes a LPCO: "The AC trinary switch has three functions: high pressure protection, low-pressure protection, and fan control" While technically that is true, a trinary ...

I had very good results using an A6 with R152a about 20 years ago in a dual evaporator system. Preasure/Temperature curve is very similar to R12, so the POA should not need adjustment. I also once had a 1993 Fleetwood. IT had a fantastic OE R134a ac system, but it was a limo chassis that was never s...

Some additional comments about R-1234yf... Last summer, I purchased a new Toyota 4Runner Limited that has the above mentioned refrigerant, my first personally owned vehicle that didn't have either R-12 or R-134a. The best it would cool for me on a hot summer day here in the humid South (~90°F) was ...