Climate control 1995 420E

[Glenn S]

I just got this 1995 E420 and there are a few things wrong. The Blower moter only runs on slow. I have checked the fuse F15 and it is good. I have changed out the climate control module with no improvement (part from used car ????) I was trying to check everything else before I go at the blower motor and blower module. I can access the plug X64 in back of the brake booster. Now my question is what signal is coming from the control module N22? Is it a 0-12V signal or a resistance? I can connect the battery to pin 2 and ground pin 1. If I could control the signal on pin 3, I could tell quickly if I need to remove the wiper and motor, or if the problem is in the wiring.

[sunman]

It's probably the blower regulator located in the blower motor area. Very common to go bad. You'll have to remove your wiper assy to get to it.

[Glenn S]

Thanks for the reply sunman/
It probably is the blower controler. I was just trying to check out as much as posible before I pulled the blower. With my luck after I have everything apart, it would turn out to be something like a wire gone bad between the climate control and the controler.

[macdrone]

First try the 30 amp strip fuses by the fuse box. Then try the climate control fuses in the fuse box (replace all aluminum fuses with copper).

[Glenn S]

I checked the 30 amp strip fuse, it was good. The climate control module had light and the blower moter did work on low. I can hear the damper valves operating when I change control setings. I will check the climate control fuse but I think its OK to. I have a 400E for a parts car. I am going to remove the blower motor and regulator for practice and posibly parts before I tare into my running 420E. What I wanted to know was if I removed the plug from the blower regulator and applied power and ground to the two terminals, what do I apply to the terminal coming from the climate control ? It's eather a resistance to ground or a voltage 0-12V.