1987 Buick will not accept freon?

Answer 1

This is a non-definitive statement. Is it that the vehicle is now set up for R-134a instead of R-12 "freon". If so then use R-134a. It's a greener refrigerant. Is the port your using to fill the system clogged, or is the valve bad. Is it because the clutch won't cycle and pull down the low side far enough so it will bring in the new refrigerant. Remember to always fill these cars on the low side. It's the bigger set of lines or the one with a blue cap on the fill up valve. the high side has smaller lines/hose and the cap if color coded is red. With a set of gauges attached and the clutch not cycling pressures on both sides will be close to the same and they should be with in 20 psi of the ambient temperature. if it's 80 degrees they could be 60- 100 psi. now with the pressure at this level and if the wiring is o.k. it should cycle the clutch when you turn the A/C on. if not then the problem lies in the wiring. remember if the car's system has a pressure close to or more than the source of refrigerant, the refrigerant won't go into the car. once you get it going on a normal 85 degree day the readings should be 25-35 psi on the low side and 185-250 on the high side. trapped air and moisture in the system will add to the pressures but not to the cooling ability of the a/c system. I hope this helped you.