1998 ML320 Possible AAM issue?
Thread Starter
Newbie
Joined: Feb 2024
Posts: 2
Likes: 0
1998 ML 320; 2015 GLK 250BT
1998 ML320 Possible AAM issue?
My ML320 has its quirks, but it's a 1998, the original model year. It's a classic. And with 214k + miles, she looks good and drives well. But, the AC stopped blowing cold and Texas summers loom.
The mechanic has tested the usual suspects, pulled apart the center console, tested the head unit, traced wiring, and consulted a specialty database he has access to.
The head unit is working properly, the wiring is sending power, the compressor kicks on when connected directly, voltages are normal where tested.
The pressure switch threw a code (AC pressure too high) and was replaced; freon's been checked and is correct level.
Still no cold AC.
Their conclusion is that the AAM is blown. I'm told this model year has no fuse between the AAM and the compressor, so when the compressor overdoes it, the AAM gets blown and not a fuse.
The other things the AAM controls are all functioning normally (horn, wipers, lights, etc).
Any advice? Or ideas on a where to source a replacement AAM?
Tried searching the forum but came up empty. If anyone can point me to something, thanks. .
Much appreciated.
The mechanic has tested the usual suspects, pulled apart the center console, tested the head unit, traced wiring, and consulted a specialty database he has access to.
The head unit is working properly, the wiring is sending power, the compressor kicks on when connected directly, voltages are normal where tested.
The pressure switch threw a code (AC pressure too high) and was replaced; freon's been checked and is correct level.
Still no cold AC.
Their conclusion is that the AAM is blown. I'm told this model year has no fuse between the AAM and the compressor, so when the compressor overdoes it, the AAM gets blown and not a fuse.
The other things the AAM controls are all functioning normally (horn, wipers, lights, etc).
Any advice? Or ideas on a where to source a replacement AAM?
Tried searching the forum but came up empty. If anyone can point me to something, thanks. .
Much appreciated.
Last edited by CityDriver; Feb 29, 2024 at 05:49 PM. Reason: add that i tried to search...
