00 ML320 blower delay/malfunction
Thread Starter
Newbie
Joined: Apr 2015
Posts: 14
Likes: 2
00ML 320, 11 E350, 12 ML350
00 ML320 blower delay/malfunction
Hello.
My AC/Heat blower (passenger footwell) takes up to 5 minutes to come on.
Now it also stays on after the car is shut off.
Once it starts operating we have full control over its speeds and temps and it works great.
Replaced the blower and blower resistor and did not help.
Thinking it is a computer problem at this point.
Help...
2000 ml 320 w 165k miles.
My AC/Heat blower (passenger footwell) takes up to 5 minutes to come on.
Now it also stays on after the car is shut off.
Once it starts operating we have full control over its speeds and temps and it works great.
Replaced the blower and blower resistor and did not help.
Thinking it is a computer problem at this point.
Help...
2000 ml 320 w 165k miles.
Super Member
Joined: May 2013
Posts: 504
Likes: 7
From: Harare, Zimbabwe
2003 ML55,2007 ML63
If it stays on after the car is off then it means you have a relay problem. Check K21 relay in underhood fusebox. Replace it with a similar one from the fusebox for diagnostic purposes, & see if the problem stopped.
Thread Starter
Newbie
Joined: Apr 2015
Posts: 14
Likes: 2
00ML 320, 11 E350, 12 ML350
Yes, that was it.
Was strange. With fan switch on tested 12v at the blower but would not run.
Seems the relay was passing 12v but at a very low amperage.
Traded relay and now it works great.
Thanks!
Was strange. With fan switch on tested 12v at the blower but would not run.
Seems the relay was passing 12v but at a very low amperage.
Traded relay and now it works great.
Thanks!
Super Member
Joined: May 2013
Posts: 504
Likes: 7
From: Harare, Zimbabwe
2003 ML55,2007 ML63
Well done!!! Glad you sorted it out.
PS Don't forget to replace & throw away the faulty relay, before something else malfunctions.
PS Don't forget to replace & throw away the faulty relay, before something else malfunctions.
Last edited by art_arev; Apr 13, 2015 at 01:08 PM.
