A/C problem on 94 Infiniti J30?

[tjvetrone1]

My Freon is fine, my heater works and the compressor engages. Is it the expansion valve or is there many other possibilities of what it could be?

 

[Brian .]

Check your high and low side pressures. The high side pressure should be the ambient temperature plus 80-100psi, and your low side pressure should be about 25psi. That will help you to determine where the problem is.

 

[bwh_jag]

Not really enough info to give you a definitive answer. Even though the compressor comes on, the compressor may not be building up enough pressure. It could be the expansion valve but, there could be a restriction (metal particles) in the system that prevent the proper flow of refrigerant. The car really needs to checked by a professional.