Air Cond compressor and Radiator Fans not working

[evodawg]

1990 Nissan 1600 nx First the fan speed inside the car only works on high. The air cond. compressor does not come on when push switch is engaged. And it seems the stock Electric Fans on the radiator are not coming on. I have checked fuses on left side of driver side and all are ok. I have noticed a fuse or computer module under the hood close to the battery. Are these fuses or something else that can be checked. Cover marked fog lights, air cond, fan1, fan2, and fuel pump. The car runs fine, I just have issues with the air cond. and fans and fan inside the car on running on high.

Thanks for any help

[MaximA32]

I would check those fuses under that cover as well as it is most likely the culprit.

[evodawg]

Ok, I'll check the relays under the hood next to the battery. How about the interior heater/cooling fan switch? It has about 5 or 6 settings but only the last setting works, (high).. OBTW the green light for the Air Cond. does come on but does not activate the air cond compressor.

[MaximA32]

The blower motor resistor is likely the problem for the blower problem. As for the a/c issue, it's probably the pressure switch.

[evodawg]

Pressure switch? Where would that be located? Are you saying if the air cond. is charged to high the compressor will not turn. I checked the air cond. with a set of gauges and it's within the green or a little above. I think it goes green, blue, yellow red. I think it was a little in the blue. Green being ok red being dangerous