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The switch is on your thermostat.
either a relay is bad or you have the switch turn to man on thermostat
fan relay switch is no good
how to check out the relay in a central air conditioning unit
The air conditioning relay switch can be found on the firewall in the engine compartment. The air conditioning relay switch will be on the drivers side of the firewall.
The 1999 Acura air-conditioner relay switch can be found in the fuse box. The air conditioner relay switch will be in the third column, second from the top.
The 1992 Chevrolet Suburban air conditioner compressor relay switch can be found in the fuse box. The air conditioning compressor relay switch will be labeled as such.
The 1997 GMC air conditioning relay switch can be found in the fuse box. The air conditioning relay switch will be in the third column, at the top.
The 2000 Chevrolet S 10 pickup truck air conditioning relay switch can be found in the fuse box. The relay switch will be in the third column.
You can find a 1997 Mazda air conditioning relay switch in the fuse box. The air conditioning relay switch will be at the top of the third column.
The 1995 Pontiac Transport air conditioning relay switch can be found in the fuse box. The air conditioning relay switch will be at the top of the third column.
The 2002 VW Jetta air conditioning relay switch can be found in the fuse box. The air conditioning relay switch will be in the third column, second from the top.