Quote:
Originally Posted by pilot53
Thanks for the quick replies Chris. I actually had a spare original klima relay, I swapped that in and all is working. Turns our theweird gauge readings are because I had the gauge valves set incorrectly  . I definately lost a bit of freon swapping the hoses on and off, now I have about 40 psi on the low side whit the ac running, do you have any idea what I should be seeing at around 85 degrees, lots of florida humidity today. I'm thinking I should give it a shot of freon (r12) to get it around 55 lbs? |
40PSI is roughly a 37˚ coil. 55 PSI is grossly overcharged (saturation temperature of ~52˚). Pressures are only relevant with full load on the system. Max fan speed and all the doors open on the car. At 85˚ ambient temp, you should have roughly 55˚ air blowing from your center vents. You're looking for a temperature split across the evaporator of 30˚ (85 - 30 = 55). Being slightly undercharged is preferable to being overcharged by any amount. Overcharging leads to liquid refrigerant circulating through the compressor and will quickly wipe your bearings out and score the cylinders.