Blower fans don't turn on & AAM replaced. Engine doesn't run on.
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Newbie
Joined: May 2024
Posts: 4
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ML320
Blower fans don't turn on & AAM replaced. Engine doesn't run on.
Hi folks,
I am newbie in here & please help! I have ML320 (2003)
My blower fans don't turn on & my A/C is blowing ambient air. To test & troubleshoot, I did the following Checked fuse F44 & is good. Removed relay K26 and it tested good. Using a multimeter connected to a ground, 30 & 86 on the relay showed 12V (i.e. they are getting power). Connected the multimeter to power & tested the relay base. 87 shows12V. Cranked the engine up & turned my A/C on & 85 doesn't show any voltage (i.e. no ground is being provided by the computer). I thought the problem is with either a climate control module OR AAM. I replaced my climate control module in the dash with a new one. That did not help. I bough a new AAM module & replaced the existing one and reconnected the wires.
Engine wouldn't start as the pins were not all the way in AAM. I corrected it. Engine cranks up. I still don't see the auxiliary fans starting & I don't see cool air. I see that the low pressure line doesn't cool as well.
Please help!
I am newbie in here & please help! I have ML320 (2003)
My blower fans don't turn on & my A/C is blowing ambient air. To test & troubleshoot, I did the following Checked fuse F44 & is good. Removed relay K26 and it tested good. Using a multimeter connected to a ground, 30 & 86 on the relay showed 12V (i.e. they are getting power). Connected the multimeter to power & tested the relay base. 87 shows12V. Cranked the engine up & turned my A/C on & 85 doesn't show any voltage (i.e. no ground is being provided by the computer). I thought the problem is with either a climate control module OR AAM. I replaced my climate control module in the dash with a new one. That did not help. I bough a new AAM module & replaced the existing one and reconnected the wires.
Engine wouldn't start as the pins were not all the way in AAM. I corrected it. Engine cranks up. I still don't see the auxiliary fans starting & I don't see cool air. I see that the low pressure line doesn't cool as well.
Please help!
Last edited by tanreddy; May 15, 2024 at 09:28 PM.
Junior Member
Joined: Sep 2023
Posts: 65
Likes: 8
From: NC Mountains
2000 ML 320/95 Ford F150 4x4/Harley Davidson 03 FLHRCI in vivid black
Hi folks,
I am newbie in here & please help! I have ML320 (2003)
My blower fans don't turn on & my A/C is blowing ambient air. To test & troubleshoot, I did the following Checked fuse F44 & is good. Removed relay K26 and it tested good. Using a multimeter connected to a ground, 30 & 86 on the relay showed 12V (i.e. they are getting power). Connected the multimeter to power & tested the relay base. 87 shows12V. Cranked the engine up & turned my A/C on & 85 doesn't show any voltage (i.e. no ground is being provided by the computer). I thought the problem is with either a climate control module OR AAM. I replaced my climate control module in the dash with a new one. That did not help. I bough a new AAM module & replaced the existing one and reconnected the wires.
Engine wouldn't start as the pins were not all the way in AAM. I corrected it. Engine cranks up. I still don't see the auxiliary fans starting & I don't see cool air. I see that the low pressure line doesn't cool as well.
Please help!
I am newbie in here & please help! I have ML320 (2003)
My blower fans don't turn on & my A/C is blowing ambient air. To test & troubleshoot, I did the following Checked fuse F44 & is good. Removed relay K26 and it tested good. Using a multimeter connected to a ground, 30 & 86 on the relay showed 12V (i.e. they are getting power). Connected the multimeter to power & tested the relay base. 87 shows12V. Cranked the engine up & turned my A/C on & 85 doesn't show any voltage (i.e. no ground is being provided by the computer). I thought the problem is with either a climate control module OR AAM. I replaced my climate control module in the dash with a new one. That did not help. I bough a new AAM module & replaced the existing one and reconnected the wires.
Engine wouldn't start as the pins were not all the way in AAM. I corrected it. Engine cranks up. I still don't see the auxiliary fans starting & I don't see cool air. I see that the low pressure line doesn't cool as well.
Please help!
Junior Member
Joined: Sep 2023
Posts: 65
Likes: 8
From: NC Mountains
2000 ML 320/95 Ford F150 4x4/Harley Davidson 03 FLHRCI in vivid black
Hi folks,
I am newbie in here & please help! I have ML320 (2003)
My blower fans don't turn on & my A/C is blowing ambient air. To test & troubleshoot, I did the following Checked fuse F44 & is good. Removed relay K26 and it tested good. Using a multimeter connected to a ground, 30 & 86 on the relay showed 12V (i.e. they are getting power). Connected the multimeter to power & tested the relay base. 87 shows12V. Cranked the engine up & turned my A/C on & 85 doesn't show any voltage (i.e. no ground is being provided by the computer). I thought the problem is with either a climate control module OR AAM. I replaced my climate control module in the dash with a new one. That did not help. I bough a new AAM module & replaced the existing one and reconnected the wires.
Engine wouldn't start as the pins were not all the way in AAM. I corrected it. Engine cranks up. I still don't see the auxiliary fans starting & I don't see cool air. I see that the low pressure line doesn't cool as well.
Please help!
I am newbie in here & please help! I have ML320 (2003)
My blower fans don't turn on & my A/C is blowing ambient air. To test & troubleshoot, I did the following Checked fuse F44 & is good. Removed relay K26 and it tested good. Using a multimeter connected to a ground, 30 & 86 on the relay showed 12V (i.e. they are getting power). Connected the multimeter to power & tested the relay base. 87 shows12V. Cranked the engine up & turned my A/C on & 85 doesn't show any voltage (i.e. no ground is being provided by the computer). I thought the problem is with either a climate control module OR AAM. I replaced my climate control module in the dash with a new one. That did not help. I bough a new AAM module & replaced the existing one and reconnected the wires.
Engine wouldn't start as the pins were not all the way in AAM. I corrected it. Engine cranks up. I still don't see the auxiliary fans starting & I don't see cool air. I see that the low pressure line doesn't cool as well.
Please help!
I just had a somewhat similar issue with mine, new AAM and all is good eccept my fans run any time the engine is on unless I pull the relay, I have also replaced and checked the #26 but it's just getting a continous signal. So I have a date with my Indie Guy 0n 7-1, I'm not sure but he may can reset the ECU so the fans work as they should and mate/program my key FOBs to the new AAM.
Let us know if you find out why yours is on the "Fritz" if you get It figured out
