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Check to make sure the fan clutch is engaging.
Check for debris stuck between the ac condenser and the radiator such as leaves.
In the ac box
The 1992 Nissan truck air-conditioner pressure switch is located in the fuse box. The fuse box can be found in the engine compartment.
insid ac box at floor board.
Cooling fan not working, or your cooling system needs a complete service. The cooling fan should be on continuously when the A/C is on.
no
check the fuse
inside ac box bolted to bottom of firewall by passengers feet.
yes
Yes you can remove it and still drive the truck......
The low pressure switch will do that when the system is low on freon.