thanks Dan.
Dan Penoff via Mercedes wrote on 3/14/20 5:03 PM:
Here’s a BW thread about using a resistor to lower the resistance of the sensor
on the block:
https://www.benzworld.org/threads/auxillary-fan-turn-on-set-point-resistor-modification.1629476/
It’s kind of convoluted reading, but I seem to recall using a couple of 2.2k
ohm resistors in parallel to get my cut in point to about 92C.
-D
On Mar 14, 2020, at 5:55 PM, Curley McLain via Mercedes <mercedes@okiebenz.com>
wrote:
Found relays K9 and K10. pulled them out, and when I put one (k10) in I had low
speed! Put the other in and had high speed! (Dryer switch jumped and top
sensor unplugged.)
With both relays back in , I plugged in the top sensor, and the dryer switch
and went for a drive. all ok for a while, Temp stable at 82. Then temp
climbing/no fans. Stopped pulled out the top sensor plug. fans running/ temp
going back to normal.
Came home, pulled the relays. changed the low speed one. everything appears
to be working again.
Could be a bad relay, bad contact on the pins or bad connection on the pins
where the relay plugs in.
The 87 has a double top sensor. one 2 pin and one 1pin. resistance, cold
between the 2 pins is infinity, compared to 5K ohm on the 91 with a 2 pin
sensor. SDL has the same 3 pin sensor. I need to go back and pull the plug
off it and check cold resistance. (it was stuck too tight to get it off by
hand) Since they are not he same as the 91 OM602, I don't know if their
resistance is meaningful for comparison or not.
I stole a relay from the SDL and stuck it in the low speed (k10) slot.
We will see what happens now.
I think the dryer switch may be ok, but no way to test it right now.
not sure if the top sensor is right and I don't know what its resistance
cold/hot should be. Anyone got information about it?
I also did further testing on the viscous clutch. It is low on oil. Had a
spare used MB one, but it had leaked oil all over. Not a good sign!
Max Dillon via Mercedes wrote on 3/14/20 3:04 PM:
I think that low speed fan circuit has a big resistor between the ABS pump and
the fender. If that resistor is open circuit, no fan operation. Had that on my
'87.
Max Dillon
Charleston SC
Mar 14, 2020 3:42:46 PM Curley McLain via Mercedes <mercedes@okiebenz.com>:
Done that. it has no effect whatsoever. (indicates electrical problem, not
mechanical)
Craig via Mercedes wrote on 3/14/20 2:30 PM:
otherwise, the next fix is to put a manual switch on the fans or wire
them to run whenever the key is on.
You can do that by shorting the terminals at the receiver/filter/dryer I
mentioned in one of my emails. I had to do that on our '90 E300D because
the switch on the side of the receiver/filter/driver was bad and removing
it would have opened the A/C system.
Craig
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