'Think I've found the aux fan relays, labeled C and D, at left rear corner
of fuse/relay box.
Wilton
----- Original Message -----
From: "WILTON" <wilt...@nc.rr.com>
To: "mercedes list" <mercedes@okiebenz.com>
Sent: Friday, August 27, 2010 5:00 PM
Subject: [MBZ] '91 350SDL air cond
Well, seems that I have a leaking air cond. expansion valve in the 350SDL
again; orig replaced 'bout 10 years ago.
Leak at exp valve detected with flame detector; system has dye now; we'll
check for more leaks again in few days.
Additionally, aux fans don't run, 'cept with 12V applied directly to lead
to motors.
Evidently fans should come on at ~300 psi (20bar); air cond tech said
pressure was ~350psi.
Fuses 1 and 5 are good and 12V pwr is sitting at downstream side of fuses.
Shorting across leads to pressure switch at dryer does nothing.
Where are relays K9 and K10 (aux. fan relays); evidently in fuse/relay box
at left rear corner of engine compartment, but which ones?
Ideas, tips?
TIA
BTW, 'placed order with Rusty few days ago for air filters and ant. fender
seal (rcvd today); had waited several days to place order, thinking I'd
notice/find the "need" to order something else; nothing else came up; even
said to Rusty, "Now that I've called to order, something else will likely
come up in a day or two." Well, sho nuff.
Wilton
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