ML350 AC issue
Thread Starter
Newbie
Joined: Mar 2014
Posts: 10
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From: South Florida
ML350 2010 gas
ML350 AC issue
hello,
apologies if i double post or otherwise brech forum etiquette, i assure you that its not intentional and is only a consequence of being unfamiliar.
my 2010 ML350 with 66K miles blows cold air when it is first started up. as i drive it gets warmer. the passenger side is cooler than the drivers side, until both sides get warm and they equalize. the longer the engine is off, the longer the cool air will last when its started up. after being off overnight, it cools for about 10 minutes. after a brief stop, it is less than a minute.
i live in south florida but drive about half the national average.
on 8/13 my mechanic said my lower side pressure was 55, and should have been 40. he added 3 oz of R134 on 8/13 and said i need a new compressor, receiver drier and evaporator expansion valve. total about $1700.
the additional freon didnt seem to make much difference. on monday i was on I-95 for 30 minutes and the car interior felt like about 100 degrees. it felt cooler outside.
my mechanic has always been honest and fair, but before biting the bullet i thought id ask forum experts for guidance.
from reading other posts, i see that having cooler air on the passenger side indicates low refrigerant. but we just added 3 ounces on 8/13.
does anyone have any thoughts?
thank you very much.
apologies if i double post or otherwise brech forum etiquette, i assure you that its not intentional and is only a consequence of being unfamiliar.
my 2010 ML350 with 66K miles blows cold air when it is first started up. as i drive it gets warmer. the passenger side is cooler than the drivers side, until both sides get warm and they equalize. the longer the engine is off, the longer the cool air will last when its started up. after being off overnight, it cools for about 10 minutes. after a brief stop, it is less than a minute.
i live in south florida but drive about half the national average.
on 8/13 my mechanic said my lower side pressure was 55, and should have been 40. he added 3 oz of R134 on 8/13 and said i need a new compressor, receiver drier and evaporator expansion valve. total about $1700.
the additional freon didnt seem to make much difference. on monday i was on I-95 for 30 minutes and the car interior felt like about 100 degrees. it felt cooler outside.
my mechanic has always been honest and fair, but before biting the bullet i thought id ask forum experts for guidance.
from reading other posts, i see that having cooler air on the passenger side indicates low refrigerant. but we just added 3 ounces on 8/13.
does anyone have any thoughts?
thank you very much.
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
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From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
With 66K I doubt seriously that you need a compressor. There is a leak somewhere and he failed to find it or he didn't bother to find it.
Did he use this similar machine to evacuate and recharge the system?
MBWorld Fanatic!
Joined: May 2015
Posts: 4,037
Likes: 1,012
From: Miami, FL
2003 CL 600
If the low side pressure was too high, that's not indicative of an underfilled system. Either the compressor isn't pumping enough or the system is overcharged. What were the high side pressures? Need more info here.
If you have the clutchless compressor on your truck, it's very common for the refrigerant control valves to fail and not let the compressor pump properly, but they usually exhibit the opposite behavior, in that they don't cool at all and then suddenly start working normally.
If you have the clutchless compressor on your truck, it's very common for the refrigerant control valves to fail and not let the compressor pump properly, but they usually exhibit the opposite behavior, in that they don't cool at all and then suddenly start working normally.
Thread Starter
Newbie
Joined: Mar 2014
Posts: 10
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From: South Florida
ML350 2010 gas
thank you maj dundee and italian joe1. !
maj dundee, unfortunately i didnt see what he used on 8/13 to check my system, but it took almost an hour. i will go back and hunt for a leak. a friend in IL said his mechanic put a dye in the freon and found his leak easily. that sounds hinky but i will ask about it.
italian joe1, MB medic. com said that MB started using clutchless compressors "on many late models" http://www.mercedesmedic.com/diagnos...mercedes-benz/
so i will ask what i have and also if he can also check the refrigerant control valve. will also ask about high side pressures.
will keep you posted when i know more---better yet when my AC is working again.
thank you again!
maj dundee, unfortunately i didnt see what he used on 8/13 to check my system, but it took almost an hour. i will go back and hunt for a leak. a friend in IL said his mechanic put a dye in the freon and found his leak easily. that sounds hinky but i will ask about it.
italian joe1, MB medic. com said that MB started using clutchless compressors "on many late models" http://www.mercedesmedic.com/diagnos...mercedes-benz/
so i will ask what i have and also if he can also check the refrigerant control valve. will also ask about high side pressures.
will keep you posted when i know more---better yet when my AC is working again.
thank you again!
Last edited by stargirl; Aug 29, 2018 at 10:51 PM.
Thread Starter
Newbie
Joined: Mar 2014
Posts: 10
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From: South Florida
ML350 2010 gas
update: after evacuating the system and refilling it with R134 and dye, no leak was found. but the compressor isnt compressing. it was about 90 degrees outside. the pressures were 60 low side (too high) , 130 high side (too low). so it looks like i will have to bite the bullet soon and have a new compressor installed. just in time for cooler weather down here LOL
thank you major dundee and italianjoe1!
thank you major dundee and italianjoe1!
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
update: after evacuating the system and refilling it with R134 and dye, no leak was found. but the compressor isnt compressing. it was about 90 degrees outside. the pressures were 60 low side (too high) , 130 high side (too low). so it looks like i will have to bite the bullet soon and have a new compressor installed. just in time for cooler weather down here LOL
thank you major dundee and italianjoe1!
thank you major dundee and italianjoe1!
https://www.densoproducts.com/Automo...sors-c247.aspx
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Thread Starter
Newbie
Joined: Mar 2014
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From: South Florida
ML350 2010 gas
will do, maj.dundee. i see that you have a 2002 ML320. before this ML350 i had a 2000 ML430 for 11 years. the 350 is gorgeous and has every option known to man, but even after 5 years i dont feel comfortable driving it. never had that issue with the 430, which was also simpler to work on. thanks again for your input!
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MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
will do, maj.dundee. i see that you have a 2002 ML320. before this ML350 i had a 2000 ML430 for 11 years. the 350 is gorgeous and has every option known to man, but even after 5 years i dont feel comfortable driving it. never had that issue with the 430, which was also simpler to work on. thanks again for your input!
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Thread Starter
Newbie
Joined: Mar 2014
Posts: 10
Likes: 0
From: South Florida
ML350 2010 gas
i do regular maintenance on my vehicles and treat them with respect. just looked at my old ML430 records and see that it also had a bunch of issues. so much for memory LOL
MBWorld Fanatic!
Joined: May 2015
Posts: 4,037
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From: Miami, FL
2003 CL 600
The early ones were a bit before my time, but I feel like an early 166 with a 276 engine and steel suspension is almost bulletproof. I want to get one for the wife as a daily driver. Just a really solid, simple truck that I think will last forever, without being an old piece of junk.
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
The early ones were a bit before my time, but I feel like an early 166 with a 276 engine and steel suspension is almost bulletproof. I want to get one for the wife as a daily driver. Just a really solid, simple truck that I think will last forever, without being an old piece of junk.
Newbie
Joined: Feb 2019
Posts: 7
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ML350
Hi
Have a AC problem with my 2007 ML350 W164..,The AC Clutch pulley hub is broken, do the centre shaft supposed to be spinning? shaft won't rotate at all.. just wondering when I applied so much force to rotate this 7mm bolt the shaft is not moving a bit even at all..is it in a locked position? or something wrong with the shaft as it is supposed to be spinning with Pulley? or the Pulley on bearing will spin and shaft just stay in position?
I have got a new front hub (clutch) kit...will this resolve the issue? or the hub will break as the shaft is locked (Pulley is rotating without any problem on bearing).?
It was blowing not too cold air in driver side before failing (seems leak) and auxiliary battery was down.
I apologies bothering you
Pls share if you got any video/info : blessxavi@gmail.com
Thank you very much
Blesson
Have a AC problem with my 2007 ML350 W164..,The AC Clutch pulley hub is broken, do the centre shaft supposed to be spinning? shaft won't rotate at all.. just wondering when I applied so much force to rotate this 7mm bolt the shaft is not moving a bit even at all..is it in a locked position? or something wrong with the shaft as it is supposed to be spinning with Pulley? or the Pulley on bearing will spin and shaft just stay in position?
I have got a new front hub (clutch) kit...will this resolve the issue? or the hub will break as the shaft is locked (Pulley is rotating without any problem on bearing).?
It was blowing not too cold air in driver side before failing (seems leak) and auxiliary battery was down.
I apologies bothering you
Pls share if you got any video/info : blessxavi@gmail.com
Thank you very much
Blesson
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Blesson, stop opening multiple posts in the same forum. I already answered your question in the other post.
https://mbworld.org/forums/m-class-w...ml#post7689563
https://mbworld.org/forums/m-class-w...ml#post7689563
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
