It happened to me twice with 2 different vehicles. Most likely cause of this is the moisture in the line which got freeze right at the expansion valve after a few minutes and clog the A/C circuit. How does moisture get into the system is something I have no explanation.
If you hook up a meter to both high and low pressure lines you would see the low pressure side slowly goes down to zero or near zero after some times.
Standard procedure to fix this is to evacuate the refrigerant, replace the dryer and recharge the system, provided your compressor is in good condition and the system does not leak.
Sunday, August 23rd, 2009 AT 9:11 PM