Re: [MBZ] 124 aux fan

2015-07-20 Thread Max Dillon via Mercedes
High speed test: short the two wires together in the temperature sensor mounted 
front top of the head.  That sensor has three wires connected, a single pin 
connector and a two-pin connector.
-- 
Max Dillon
Charleston SC
'87 300TD
'95 E300

On July 20, 2015 3:58:33 PM EDT, WILTON via Mercedes mercedes@okiebenz.com 
wrote:
Somebody please remind me of the testing procedure for 124 aux fan.

Wilton
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Re: [MBZ] 124 aux fan

2015-07-20 Thread Max Dillon via Mercedes
There is also a low speed test, don't remember off the top of my head, but IIRC 
there is a relay in the back of the fuse box, short the appropriate pins to 
make the fan run on low speed.
-- 
Max Dillon
Charleston SC
'87 300TD
'95 E300
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Re: [MBZ] 124 aux fan

2015-07-20 Thread Peter Frederick via Mercedes
Low speed switch is on the AC receiver/dryer, I think the ones with  
the long pigtail (the other is the low pressure switch). With ignition  
on, shorting the two wires will cause the fan to run at low speed.


You can test the fan (sans relays and resistor) by connecting the two  
leads at the fan bracket after unplugging to a battery -- caution,  
small leads will get HOT, it draws some amps on high.


If it runs from the battery but not the switches, the relay is bad.   
If the low speed doesn't work, check for a cracked resistor, it's  
right by the receiver/dryer.


Peter

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Re: [MBZ] 124 aux fan

2014-08-26 Thread Jaime Kopchinski via Mercedes
There is probably a fuse on the low speed relay that often blows.  It's in
the second half of the fuse box that you have to uncover by removing some
screws.

At least, this was the case in my 95 124.

Jaime


On Sunday, August 24, 2014, Kaleb C. Striplin via Mercedes 
mercedes@okiebenz.com wrote:

 Messing with the kids 93 300D.  I evacuated and recharged the AC with my
 AC machine.  The high side was getting way high and compressor shuts off.
 Aux fans not coming on.  I tried jumping the switch on the drier, they do
 not come up but I can hear the relay click.  if I pull the 2 pin plug that
 goes to the fans and apply power from battery to 1 of the pins, the fans
 run, if I apply power to the other pin, it shorts.  I had thought you would
 apply power to 1 pin and connect the other pin to ground.  I wonder if I
 got a short to ground since applying power to the 1 pin runs the fans? If I
 pull the 2 pin plug off the temp sensor or whatever it is on the top of the
 engine, the fans run on high.  I replaced the resistor from one I had from
 another car and it still did not work, but the one I pulled off the other
 car seems iffy.  So, I am just leaving the plug off the engine for now so
 at least the fan is running.  Of course it comes on as soon as the key is
 turned on.

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-- 
Jaime Kopchinski
http://www.jaimekop.com/
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Re: [MBZ] 124 aux fan

2014-08-24 Thread Peter Frederick via Mercedes
The resistor (for low speed) is shot.  It's by the receiver/dryer,  
most likely it's cracked.  Common failure.  Might just be broken or  
corroded wires, and it's possible the connection in the fuse box came  
apart, but not terribly likely.


Peter

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Re: [MBZ] 124 aux fan

2014-08-24 Thread Kaleb C. Striplin via Mercedes
I replaced the one on my 95 but that ended up not being the problem, so 
that one should be good except I cant find it!



On 8/24/2014 1:57 PM, Peter Frederick wrote:
The resistor (for low speed) is shot.  It's by the receiver/dryer, 
most likely it's cracked.  Common failure.  Might just be broken or 
corroded wires, and it's possible the connection in the fuse box came 
apart, but not terribly likely.


Peter



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