Ford A/C :: 2006 F250 - AC Doesn't Work / Not Even Cool Air
May 7, 2010
I just got this 2006 F250 with a 6.0 diesel in January. Didn't check the AC until now. It doesn't work, not even cool air. I borrowed a gauge set. The static pressure in the system was 95 psi (77 F outside). I started the truck 1500 RPM with AC Max blower high, windows down. When the AC pump would run it would draw the low side down below about 20 and the high side pressure would go to about 150 before the pump would kick out (about 1 second pumping). It looked like it was low on refrigerant. Easy fix, WRONG.
I started adding a can of 134a (12 oz)with dye, to the system. The can got cold, and was going into the system, but the low side readings weren't going anywhere, the pump was still cutting off on low pressure. Still about a 1 second pump run time. The high side pressure were going up fast. After the can was in the high side pressure was going up to about 450. The low side would creep upto about 65 and when the pump would kick in it would draw it way down to maybe 30. Still very short pump times. I don't think the air ever came out of the vents even cool.
I got cold feet about the high side pressure and lowered the charge on the system. The new static pressure is 115.
Did I overcharge the system too fast? Does the system have to run for a while after a charge for the high side pressure to drop? It seems to me like there is a blockage causing the low side to be too low and the high side to be too high. Will air in the system cause this? What next?
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