I did the standard routine of evacuation and recharge. I also added dye into the system to aid in leak detection.
He called me the next day to tell me that it was still doing the same thing. It would cool for a few minutes then get warm.
I checked the pressure readings and they were about 10 to 15 psi off. It had me puzzled. I suspect the compressor, because the high readings were bouncing. This typically happens when the valves in the compressor are warped and not sealing all the way. So recommendations were replacements of the following:
- Compressor
- Drier
- Expansion Valve
- Evaporator
Sure enough after several hours of dash panel disassembly, we found a leaking evaporator. Next is the installation of a new compressor and drier.
Testing after the reassembly showed pressure readings that were 10-15 psi higher and still cooling was erratic. The bouncing HIGH pressure reading stopped. But it still wasn't right.
Where is the heat coming from?
DUH!!! The heater core.
I remove the Radio and A/C controler to gain access to the heater core inspection cover. And sure enough the heater core was at Engine tempature. Now to check out the Heater control valve. The heater control valve defaults to open. I checked the power supplied to the valve, and it has no battery voltage. After further testing I found the #32 fuse missing. Installed 7.5 amp fuse and now the A/C is blowing a steading 54 degrees all the time.
