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1993 300E 2.8L, 2010 ML350
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38 Posts
Discussion Starter #41
That is the goal. I also replaced the B relay with the new one and it seemed to work. I'll let you know what happens.
 

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1993 300E 2.8L, 2010 ML350
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38 Posts
Discussion Starter #42
I changed it all out and still nothing. I am guessing the resistor is bad. When I put power directly to the low power side, the fans go. Could it be the relay?
 

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95" W124/ E220 MasterPiece and 01" W210/ E200 KOMPRESSER
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274 Posts

Hope my article can help you have a better idea of the activation circuit.
 

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Registered
1993 300E 2.8L, 2010 ML350
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38 Posts
Discussion Starter #44
Part of me just wants to bridge the resistor, knowing that it will mean full fans when AC is on. Still. I cannot find that resistor available anywhere.
 

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1993 300E 2.8L, 2010 ML350
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38 Posts
Discussion Starter #46
Been looking all around the area and even contacted MBIparts. I did find this one, and though not perfect, It seems like it will work.
 

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Premium Member
1995 E320 Wagon
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77 Posts
Been looking all around the area and even contacted MBIparts. I did find this one, and though not perfect, It seems like it will work.
 

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26 Posts
Can anyone give me advice on something my A/C is doing on a 1994 W124 E320. I have had the blower fan and regulator replaced along with the clutch adjusted. It will be cooling
fine, and when I get back into the car it will not work. The next morning or that afternoon, I get in it and it is cooling again. But sometimes it does it in the middle of a long
day of 100 degrees when I am out shopping. Any ideas?

Thanks.
 

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Registered
1993 300E 2.8L, 2010 ML350
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38 Posts
Discussion Starter #49
So based on this post, I ran a wire from the battery to the resistor. The low speed ran fine so my resistor is good.

So I took a paperclip and bridged the drier sensor and they didn't fire up at all. So that makes me think it's the relay.

Agree?
 
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