If your Safari GMC air is blowing in low only, you should check for loose vacuum lines. It could also be that the blower is about to go out and will need to be replaced soon.
low on freon
if its blowing, but not blowing cold its low on coolant. it takes r134a.
Answer freon install 1991 Chevythe low side is the big tubing high is small you should look for a siver canaster about the size of a thermus it will have a connection for low pressure to insert freon into system
if the compressor is Running you are low on freon, if its not then you have a electrical problem
low on refrigerant or the compressor isn't running..
Low refrigerant charge? Temperature control cable not adjusted properly?
you may just be low on freon
low side port is the one at the compressor
First thing to check is if it's icing over. If so, low on fridgerent.
Low coolant and a clogged heater core are possibilities.
The 1998 GMC Jimmy air-conditioner low pressure for is located on the top of the air conditioner compressor. The low pressure port will be marked as such.
you may be low on freon and jsut need a good charge of R134a