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 ...

i heard of people saying the low side is pulling a vacuum becasue the expaansion valve is stuck or there is a restriction. but i dont understand how could get to a vacum bc the low pressure swithc would shut it all down. like i say my real problem is the 10 - 15 second cycling. as described above. ...

I have seen 120+ ambients on a day that is 110 in the shade here in Texas. Definitely takes a good engine driven clutch fan and good sized condenser to keep things cool. I just reconfigured the front air only a/c system in a 1987 G20 van that I put a L31 350 Vortec in. I used the Vortec accessory br...

That being some said, ordered some parts to enable a V7 to be swapped on it and keep the belt spacing for the rest of the vans accessories. Will get to that project before summer. V7 moves more BTUs at full stroke than the A6 does. My finger is pointing at the compressors capacity being inadequate, ...