Just found engine temp sensor; not as hard to access as I was afraid it
would be! 'Sticking right up on top of thermostat housing right by fuel
filter at left front corner of engine. I'll run it after a while and see
what the fans do with coolant temp sensor disconnected.
Wilton
----- Original Message -----
From: "WILTON" <wilt...@nc.rr.com>
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Saturday, August 28, 2010 10:15 AM
Subject: Re: [MBZ] '91 350SDL air cond
R12; still has R12.
BTW, 'beginning to suspect engine coolant temp sensor for the aux fan
prob; coolant temp gage has been erratic for 4 or 5 days, at least; SWMBO
told me about it; don't really know how long it had been erratic before
she told me. All other gages read normally. Reconfirms why I need to
drive that car coupla times a week.
Gonna try to reach the sensor this morning for test.
Wilton
----- Original Message -----
From: "Dieselhead" <126die...@gmail.com>
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Saturday, August 28, 2010 9:32 AM
Subject: Re: [MBZ] '91 350SDL air cond
Just for curiosity: Wilton did your SDL come out of the factory with R12
or 134a?
Well, maybe I should have said, "---leaking at the expansion valve."
:<))))
Wilton
----- Original Message ----- From: "Dillon, Meade M CIV
SPAWARSYSCEN-ATLANTIC,53310" <meade.m.dil...@navy.mil>
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Friday, August 27, 2010 6:22 PM
Subject: Re: [MBZ] '91 350SDL air cond
Leaking valve, or leaking o-rings? Should be 4 at that expansion valve.
While you've got the system open, replace as many o-rings as you can and
put off more leaks for another 10 years...
-Max
________________________________
From: mercedes-boun...@okiebenz.com on behalf of WILTON
Sent: Fri 8/27/2010 5:00 PM
To: mercedes list
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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