A/c not building pressure - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Davidf · 08-22-2021, 08:33 AM

Ok, this one has me stumped. I retrofitted my stock a/c system to a CCOT (orifice tube and accumulator) system when I did my ls swap. Started to charge the system with R-134a and after several cans, could not get any high side pressure, low side very low while filling and could see pressure only when shaking can while filling. Shut off compressor and saw maybe 75 psi equalization pressures. Turn on compressor and virtually not low or high side pressures…no cooling effect what so ever. 60oz later, I stopped. What gives?

08-22-2021, 08:33 AM	#1
Davidf Registered User Join Date: Nov 2014 Location: Austin Posts: 749	A/c not building pressure Ok, this one has me stumped. I retrofitted my stock a/c system to a CCOT (orifice tube and accumulator) system when I did my ls swap. Started to charge the system with R-134a and after several cans, could not get any high side pressure, low side very low while filling and could see pressure only when shaking can while filling. Shut off compressor and saw maybe 75 psi equalization pressures. Turn on compressor and virtually not low or high side pressures…no cooling effect what so ever. 60oz later, I stopped. What gives?



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