Disassembled the monovalve, cleaned it, flushed it, checked the diaphrams and reassembled. Tested it and it was operational. Also check the resistance across the terminals and that also checked out OK.

Started car again, and noticed that once again, hot air from the driver's side vent, BUT cold air from the passenger side vent. Also seemed line the center vents were not to normal flow, sooooo, now checking out the vent layout and vacuum hoses...

Any more suggestions?

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87 300SDL - 215K Miles !!
99 F-350CC Dually PSD - 190K
86 300SDL - 189K
All on B-100