1989 Honda Civic DX 4 Cyl 1.50L
Body & Interior
A/C refrigerant pressure drops to 0 when turned on
Air conditioning hasn't worked since I got the car, finally decided to recharge. After recharging, I detected no change (after several days). I found that the refrigerant pressure was normal until the AC was turned on, at which point it dropped to 0. When turned off, it returned to normal. The "off" pressure hasn't changed over several days, so it doesn't seem like a leak. Any ideas on what the problem could be and what might help?
R134A pressures are as follows: