Hey everyone, I searched the archives and found little help on this. I charged the system (converted to 134-A) in my '70 LeBaron last night; but, I had to run a 'hot' wire to the compressor to get it to run. It has the Auto Temp (not the Auto Temp 2 system...please note) HVAC system. System could use a partial can of refrigerant yet; but w/in opperating pressure. What I'ld like to know is if there is something commonly malfunctioning on this system to give me a base starting point in diagnosing the problem. What I have already checked: 1. 20A fuse...power both sides (heater A/C fuse) (used test light) 2. No power to compressor (used test light) 3. No power present at the Low Pressure cut-off switch (used test light) 4 Vacuum lines all hooked up I used a test light to check for power; but, I didn't have my Multimeter to check how much power was present or the resistances of the switches. I have located the Master Switch and Compressor Switch under the right side of the dash. I didn't test these due to it being midnight, last night. I have great hopes in working on the A/C tonight. I will have my multimeter and vacuum gage/pump to better diagnos the system. Out of curiosity...if I jump the Low Pressure Switch, Compressor Switch, and Master Switch will the A/C compressor run/engage regardless??? Please help as you can. I'ld really like the A/C to work on the Chattanooga trip in a couple weeks. Thanks! chris '70 Imperial LeBaron _________________________________________________________________ Watch LIVE baseball games on your computer with MLB.TV, included with MSN Premium! http://join.msn.com/?page=features/mlb&pgmarket=en-us/go/onm00200439ave/direct/01/