You might try grounding the low pressure switch wire that goes to the
KLIMA with the engine running. This should engage the compressor if
the KLIMA is good as the only signal to the KLIMA from the PBCU is a
ground. If it does not come on, there is something wrong with the
KLIMA or circuit to the clutch. You can also test the clutch itself
-- if the coil is OPEN, it won't engage no matter what.
Obviously you must have power to the PBCU to get it to operate, but
since all it does to operate the compressor is ground the signal wire
to the KLIMA, the PBCU unit being dead is like likely that some other
failure. Do check the fuse -- you usually get no fan and full heat if
it's bad since the monovalve will be open all the time.
Peter
_______________________________________
http://www.okiebenz.com
For new and used parts go to 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
