Last night I rigged a 10w test light bulb to the monovalve control signal connector (21w is too big, overdraws the PBU and it shuts off to self-protect).
The bulb test showed proper result for one test in the FSM: put the PBU into off state (button 0 on the far right) and read voltage, which is supposed to be over 11 volts nominal. The bulb stayed on bright continuously, indicating the monovalve would be held in the closed position. Voltage was 13 volts (engine running). The other test result is undetermined. With the temp. selector wheel on "Min" and AC engaged, the bulb would stay lit for 3-4 seconds, then briefly shut off for about half a second, and repeat that cycle. I didn't try reading the voltage with my cheapo DMM from Harbor Freight. What says the collective wisdom? Original problem I'm trying to solve is that the AC cooled air from the side vents is warmer than the AC cooled air from the center vent. Now I don't have a full charge in the system, after I replaced the condenser I put in just enough R134 to get the system running for an operational test and check for leaks, and so it's only got about 10-12 oz of R134. Maybe I should fully charge and stop complaining? I've got some hydrocarbon-based refrigerant to test next. ------------- Max Charleston SC _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
