The AC stopped working on my 92 164. The fuse for the blower is good. I am not getting electrical power to the compressor. I'm thinking a relay has malfunctioned. I have know idea where it is located on the car. I'm missing something somewhere. Any Ideas would be greatly appreciated.
On the USA spec 164 the blower motor 12v 40A fuse bar is located on back of false firewall directly behind the engine cooling fan 40A fuse bar.
The actual A/C control system 10A fuse F12 is far right fuse position 18 in third row down in main fuse box. It sends power with key on to energizing pins 86 of both a/c compressor clutch relay and blower motor relay.
So blower motor will run even though if Freon level low (25-29 psi) BUT compressor clutch will not get power from compressor relay located behind speedo cluster in dash.
That relay hardly ever goes bad. To test relay and see if compressor clutch will engage even if Freon level to low you need to locate pressure switch on receiver dryer black cylinder on top of evaporator box behind false firewall. Locate RED two-wire connector on pressure switch with key on ground green-blackk wire in red coinnector to chassis ground and see if relay clicks in dash and compressor clutch engages if so you need to put a/c gauge set low (blue if converted to R134a) hose on low pressure service fitting on long silver cartridge in front of engine and see what the pressure is and if lower than about 25-29 psi compressor clutch relay will not be grounded to engage clutch.