I have a 2001 gs300 and about 6 months ago the a/c was working fine ,then sometimes I had to tun it on and off a few times to make it work until finally it stop cooling.The blower works but is just not cold air.I started to look in to it and found that the compressor clutch is working,it engages when is turn on,I check the pressure and there is no difference between the high and low sides I was getting about 125 psi on both sides.Any ideas?