AC question
Thread Starter
Junior Member
Joined: Mar 2010
Posts: 37
Likes: 1
1999 ML430
AC question
I just need some info in general on how the AC system works on the 1999 ML430.
I ask because mine is blowing hot air and i am beginning a diagnosis.
First, the two large fans at the front of the vehicle. Is one suppose to come on as soon as i turn on the AC because its not. If so, then there is the start of my problem.
I have checked fuse #44 and all is well there. Next stop will be checking the system itself for freon and pressure etc.
I ask because mine is blowing hot air and i am beginning a diagnosis.
First, the two large fans at the front of the vehicle. Is one suppose to come on as soon as i turn on the AC because its not. If so, then there is the start of my problem.
I have checked fuse #44 and all is well there. Next stop will be checking the system itself for freon and pressure etc.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 4,260
Likes: 6
From: Philadelphia area
2010 ML550, 2010 E350 4M, 1966 Corvette Convt C2
Super Member
Joined: May 2009
Posts: 673
Likes: 27
From: Frederick
2000 ML320, 2005 E320 CDI
My fans kicked on and off just now while the AC was on and I was recharging it. They would come on...stay for a little while...then cut off...over and over during the 20 minutes I was under the hood.
Thread Starter
Junior Member
Joined: Mar 2010
Posts: 37
Likes: 1
1999 ML430
Thanks for the responses!! I have another question.
I think i found the low pressure port for the AC (passenger side firewall near battery). Where is the high pressure port? I found a recharging kit that checks the pressure of both the lo and hi side simultaneously, so i need to find the low port.
I think i found the low pressure port for the AC (passenger side firewall near battery). Where is the high pressure port? I found a recharging kit that checks the pressure of both the lo and hi side simultaneously, so i need to find the low port.
Last edited by LMA1973; Apr 2, 2010 at 10:03 PM.
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MBWorld Fanatic!
Joined: Nov 2001
Posts: 4,260
Likes: 6
From: Philadelphia area
2010 ML550, 2010 E350 4M, 1966 Corvette Convt C2
Thats great, you did the right thing. Did they find a leak?? You will be cool this summer while the rest of the DIYers are sweating holding their cans of R134 from Autozone attempting to get theirs to work!!
