Re: r134a numbers with stock Condenser & replacement POA
Originally Posted by DUTCH MAX HEADWORK
That low pressure switch on the poa eliminator is what will control all the cycling of your compressor. That pdf shows how to set it. The high pressure switch that should be somewhere in the system will only cycle out if the pressures reach about 400psi on the high side. You should never see this pressure in a properly functioning system, but a poorly functioning condenser could push you up that high.
Are you still running the complete stock wiring system with just the addition of the poa low press switch?
Make sure to purge your gauges before hooking them up. Don't want to be forcing air in each time you hook up. Most of the better gauge sets will hold pressure in the lines. The yellow one will hold pressure if you close and keep the can tap connected. A mistake I've seen made is not closing the valve and removing the empty can, filling the yellow hose with air and not purging. Ends up
pushing a nice amount of air into the system.
We'll catch you tomorrow.
Hi Al, New test today, here are some pics. Cold Motor shut off, high side and low side showed 92 psi. Here is a pic before starting the motor, you can see my POA eliminator hookup and the sanden compressor is below the alternator. I am running the march serpentine belt system.
Here is a pic of the dryer window after running the air cond. for a while
Ok, here are the numbers I got. The test was done in my garage which was 85 deg.. ambient. No fan in front and not much room for cooling. Big block at 1400 rpm.
low side, high side, center vent temp., time
43, 145, 59, 0 min
40, 148, 53, 1 min
40, 150, 52, 2 min
39, 155, 51, 3 min.
39, 165, 51, 4 min.
41, 175, 53, 5 min.
44, 185, 55, 6 min.
46, 198, 57, 7 min.
Temperature in the garage near the front of the motor after 7 min. is now 107 deg. I shut it down for 5 min. Motor is now warmed up but, not hot.
Restart - Temp is 95 deg. infront of the Chevelle
53, 210, 65, 1 min.
55, 245, 65, 2 min.
55, 250, 65, 3 min.
It does seem that the Expansion valve temp sensor fix helped, but, I am thinking I need a parallel flow condenser, new expansion valve, new dryer.
Note: The Sanden compressor and dryer have been in the Chevelle since 2006, but, have not been used much. I had to get the suitcase/evaporator fan motor, evaporator, heater core all straightened out first. I will have to evacuate the system for the new parts, and I am wondering how to validate that my Sanden compressor is 100 percent ?
I am going for a spin now in the summer heat and see how low the center vent temp goes. To be cont.....
1970 Chevelle SS396 (408), Fathom Blue,
Original Block & Forged Crank, KB Pistons, Edelbrock 6045 Heads,Comp Cam 292H, March Serpentine, RPM AirGap,750HP,100hp Nitrous
A/F Wideband,Tremec TKO 600, 12 bolt,
30 spline Moser Axles, Richmond 3:73's, Hotchkis control arms, swaybars, springs, Wilwood 12" rotors D/S, 4 piston calipers
Last edited by hjdca; Aug 14th, 19 at 4:54 PM.