Proper AC Charge after System Evac, Blows Warm Air
1993 Bonneville SLE, 101k miles, r12 to r134 conversion performed by professional shop in 1998. For years I have tolerated semi warm vent temperatures but since I drive the car so infrequently, it never really bothered me. Put this one away in the winter (have a 96 Buick as year round daily driver, also 3.8L)
Buick has been down and out, so the Bonny has been put into service. Has been hot as hell here (Buffalo NY believe it or not) so the semi warm ac put me into action.
Have never touched the system in the 13 years I have owned the car, and not sure what condition the ac system was in, so I did the following:
-Had Pep Boys evac and leak test the system. No leaks.
-Ran my 2.5cfm vacuum pump on the system for 45 minutes just to be sure all moisture was pulled from system as a precaution.
-Did my calculations of r134 vs. r12 for the refill, took three 12 oz cans of r134 which resulted in 33oz of refrigerant and 3 oz of oil. Purged yellow fill hose of air with refrigerant to remove air before filling system. Compressor started up about third of the way through the first can. Compressor runs quietly and continuously. High and low side gauges are in proper ranges.
-Lowest vent temp is about 55 degrees, doors open, system on max cool ambient temp about 80. Basically the same performance I was getting before the evac and recharge. I dont think it is a blend door issue because defrost and all other settings seem to function fine (i.e. air direction changes as I change the directional settings). Obviously I am looking for somewhere around 38-42 degrees at the center vent. Pipe running from the accumulator to the compressor ice cold and lots of condensation dripping.
Your thoughts and suggestions are most welcome.