M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

Heater has no heat, HELP

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Old 12-18-2016, 01:05 AM
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2001 M 430

this is it
Old 12-18-2016, 01:07 AM
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Did you remove the Rockauto motor and attempt to turn the bottom socket, and does it turn?
Old 12-18-2016, 01:08 AM
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I can not turn by hand.
It turned counter clockwise when I turned on key when I first installed.
Old 12-18-2016, 01:13 AM
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Originally Posted by Caligirl
I can not turn by hand.
It turned counter clockwise when I turned on key when I first installed.

Then the motor should be good. But you said that you were able to move the levers with the Rock motor in place.
Old 12-18-2016, 01:17 AM
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No, I could move the levers with no motor in place.
When I first installed rock motor, it moved the levers and stopped. (motor turning counter clockwise) controls were in off position. When I turned controls to heat-nothing to AC nothing.
Old 12-18-2016, 01:23 AM
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Did you start the engine and then try everything?
Old 12-18-2016, 01:25 AM
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yes I did. I wanted to make sure that the motor was warm and that I had heat, which I did, but could not get it to go back. When I removed motor and moved linkage back and forth by hand, I had heat and ac
Old 12-18-2016, 01:39 AM
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There are 3 possibilities.

Check fuse #16 to see if it is blown.

The Double Combo Sw. is not connected.

The Cont. Module N19 is faulty.
Attached Thumbnails Heater has no heat, HELP-n19-location.jpg  
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Old 12-18-2016, 01:44 AM
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When I was checking fuses, before tearing everything apart or even ordering any parts, #16 was missing. I thought that the dealer might have removed. So I purchased 15 amp fuses and put one in.
I will check the double sw tomorrow.
How can I tell if Module is faulty and where is it located?
Old 12-18-2016, 01:54 AM
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They removed fuse 16. First check it again to see if it is blown. Then check to see if the Double Sw. is connected and check for 12v at the GREY wire with the eng. running.
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Old 12-18-2016, 01:59 AM
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I checked it today after all the back and forth, it is not blown.
I will check Sw,
Where is grey wire? at the blend door? There are many wires. I have a volt/amp tester.
Old 12-18-2016, 02:06 AM
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The GREY wire at the back of the Double Combo Switch. You already said that it was connected.
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Old 12-18-2016, 02:08 AM
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OK, thanks you are AWESOME
Old 12-18-2016, 02:12 AM
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Are we signing off until later today?
Old 12-18-2016, 02:14 AM
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Yes, I know that it is real late in New York, thank you for staying up so late trying to help me.
It is still yesterday here.
Old 12-18-2016, 02:14 AM
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Have a good night
Old 12-18-2016, 02:32 AM
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Check the GREY wire in pos. G for 12v at the connector.
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Old 12-19-2016, 06:36 PM
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Everything was so important to you. Many questions and PMs and now you disappeared. Never again.
Old 12-21-2016, 11:35 AM
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I did not disappear, my internet has been down for 4 days. Where I live in the mountains, I am lucky if I have power. (lucky I have a generator)
I wanted to let you know that I was able to get it working (with your help)
I thought about that #16 fuse and even though it was a new fuse I put in, I put a different one in. Then I unplugged and plugged in everything again. It worked just like it should.
You are AWESOME, I hope everyone that knows you realizes that.
I wish you a very Merry Christmas and a Happy New Year.
And please know I appreciate everything you did.

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