D110 AC Repair
Tring to get the stock AC going in the '93 NAS D110. Accoring to PO, it has not run in 7+ years and he never tried to fix it. Got the AB retrofit kit but the drier that came with it is not plug and play with the OEM one so I just tried using the stock one. I pulled the compressor as needed, filled with the new oil, installed new belt, replaced the other fittings and o-rings for R134, and went to work.
The compressor clutch is not kicking on when AC is engaged - its not getting power based on testing the connector. Condenser fans and blower motor are working fine. I can get the compressor on by hot-wiring it and it runs and I was able to fill some R134 and get some cold air to blow. Based on the circuit diagram, I think the pressure switches may need replacing. Any idea where they are? I assume they are in the black box up by the PS of the firewall in the engine bay.
All fuses were checked and the the relays seem to be working though need to dig there a little deeper also.
One other question since I am new to AC work - how do you know if/when a compressor is bad? When it ran (hot-wired) I got the system to charge and it blew some cold air but not very cold. I think I need a 101 on AC systems.
'93 NAS D110 #437