Impala A/c trouble

So i have this poor 2003 impala which just started having a/c problems. The very firstthing i tried was replacing the head unit with no success. Then today i changed the low pressure switch and checked the voltage (5v) and continutity across the points with no avail. The clucth refuses to kick in. Fuses are all ok, ive tried changing relays with the Ignition circuit with no change. I hot jumped to clutch to se if the clutch was defective and it worked with this trouble shooting trick. r134a guages claim 120 lbs of freon . Something is telling the clutch to not kick in and i fear ill have to let my daughter drive thru another hot oklahoma summer with out ac. If anyone has any insight on what i may have over looked, all help or comments are appreciated.


Part Bin
Salvage Yard Control Head Unit
Dealer New Pressure Switch

Diagnostics
5v to switch
continuity checks ok
relays not defective
fuses all good
MoDis Plugged in for codes, codes cleared for pressure switch circuit has not reappeared after dealer switch installed




Thanks!!! :banghead: :banghead: :banghead:

Thanks, youve been wonderful at helping me pull my hair out. I can see why this forum is so successful. YOud think that the 79 people who looked might at least one would say, i dont know but one time on my #example here# or maybe point me to anopther forum page..... But i see now. I guess i dont need a membership so admins an delete this wasted space and my account... Youve been real great


Thanks Again!!!

Easy killer. By 120lbs of freon, are you saying it's operating at 120psi? That is way high, even for the high side reading. It sounds like you have a blockage, causing the system to shut down due to high pressure readings.