L31MaxExpress
I'm Awesome
For low pressure cutout, turn the rear blower off if equipped, front blower on low speed, recirculate function on, rev the engine up to 2,000 rpm it should cycle on the low pressure cutout around 22 psi. For high side cutout, both fans on high speed, outside air, block the grille off with cardboard, then bring it up to 2K, should see it cut before 430 psi. That test is a bit scary with old rubber hoses especially, definitely wear some safety goggles as PPE.Great stuff L31ME!
I had a little time yesterday and today to work on the AC. I had my neighbor with the machine pull the refrigerant yesterday. He recovered roughly 64 oz which is spec for this suburban, so that was good. I still replaced the high pressure valve.
1) I slapped on the four seasons compressor 88947 with the smaller pulley. Luckily happened to have a slightly shorter belt that fit perfect. The compressor case looks same size as the Delphi I pulled. But it is larger 210cc capacity?
2) I swapped in the Boxi parallel flow condenser (Part number in my last post) It was a good stock fit.
3) I swapped in a fixed 0.062 orifice tube.
The one it replaced was preinstalled in the new UAC refrigerant y-line I installed with winter overhaul. It appeared to be slightly smaller orifice than the 0.062" fixed that is now installed.
Pulled a vacuum for over an hour to draw out any moisture. Held vacuum perfectly for over an hour. Looking to recharge tomorrow. Just need to decide on putting r134 back in or giving the r152 a shot. I will probably just have r134 put in for now just to limit the variables. I should have case of r152a, side canister tap arriving in next day or two. So if the system is still not up to *****, I will consider trying r152a.
I haven't installed the pusher fan. Looks like I will have to relocate the trans cooler or the engine oil cooler to make the aux fan fit. That will have to wait until winter.
I do have that adjustable low side cutout switch on hand (and connector), and have not installed that yet. What's a good way to determine what pressure current stock switch is cutting out at? Same question for high side cutoff switch? Is there a test with gauges or?
Lastly, the
88947 is advertised as a 10 cylinder, 210cc displacement. Works better than any compressor I have had on my 97 including the factory OE GM. From what I can find the OE 6 cylinder HT6 was 170cc.