E350 Coupe | AC problem.
Thread Starter
Newbie
Joined: Jun 2016
Posts: 12
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From: Lebanon\Beirut
E350 coupe 2010
E350 Coupe | AC problem.
Hello Guys,
I'm a new mercedes owner and I don't know if this thread has already been opened (did some searching but couldn't find a similar one).
I drive a 2010 E350 coupe, when I start the AC for the first time in the morning, the blown air is not cool at all, (as if the compressor did not start)
However with some throttle, it works just fine and continues to work until the car is off for a few hours, (I try it again after 9 hrs work) then the same issue happens again.
I did a gas vacuum and reinstalled gas, and changed some kind of a valve that is located on the compressor but the problem was not solved.
My local workshop suggested to replace the compressor but I would really appreciate ur advise before doing anything.
Thank you.
I'm a new mercedes owner and I don't know if this thread has already been opened (did some searching but couldn't find a similar one).
I drive a 2010 E350 coupe, when I start the AC for the first time in the morning, the blown air is not cool at all, (as if the compressor did not start)
However with some throttle, it works just fine and continues to work until the car is off for a few hours, (I try it again after 9 hrs work) then the same issue happens again.
I did a gas vacuum and reinstalled gas, and changed some kind of a valve that is located on the compressor but the problem was not solved.
My local workshop suggested to replace the compressor but I would really appreciate ur advise before doing anything.
Thank you.
Thread Starter
Newbie
Joined: Jun 2016
Posts: 12
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From: Lebanon\Beirut
E350 coupe 2010
Thank you Plutoe,
Could you please explain what kind of gauges?
Unfortunately it will be a little difficult to find workshops with advanced tools where I live (Lebanon), so I was kinda hoping that someone in the forum had experienced the same issue and could share this experience.
- Is it possible that a malfunctioning compressor doesn't start immediately but with throttles it starts and works normally until the car is parked for several hours?
- Could it be a normal behavior and maybe it has some kind of delay?
I'm not even sure if the compressor is starting or not, but I am sure that it doesn't blow cool air until the rpm is above 2000 for a few seconds.
P.S.: I am in a wheelchair so it's a little hard for me to diagnose the problem myself, but honestly I don't really trust the mechanics we have here and I know you guys are more expert than most of them.
Thank you.
Could you please explain what kind of gauges?
Unfortunately it will be a little difficult to find workshops with advanced tools where I live (Lebanon), so I was kinda hoping that someone in the forum had experienced the same issue and could share this experience.
- Is it possible that a malfunctioning compressor doesn't start immediately but with throttles it starts and works normally until the car is parked for several hours?
- Could it be a normal behavior and maybe it has some kind of delay?
I'm not even sure if the compressor is starting or not, but I am sure that it doesn't blow cool air until the rpm is above 2000 for a few seconds.
P.S.: I am in a wheelchair so it's a little hard for me to diagnose the problem myself, but honestly I don't really trust the mechanics we have here and I know you guys are more expert than most of them.
Thank you.
Thread Starter
Newbie
Joined: Jun 2016
Posts: 12
Likes: 0
From: Lebanon\Beirut
E350 coupe 2010
I don't understand what you are so upset about.
I know that a well trained mechanic with the good tools can diagnose and repair the problem and that I need to find one, and I know that I can do researches on google.
I was asking if someone had ever experienced the same problem and has any useful advice other than google and going to a mechanic of course.
I appreciate your time but if you can't answer my questions then just don't.
I know that a well trained mechanic with the good tools can diagnose and repair the problem and that I need to find one, and I know that I can do researches on google.
I was asking if someone had ever experienced the same problem and has any useful advice other than google and going to a mechanic of course.
I appreciate your time but if you can't answer my questions then just don't.
Super Member
Joined: May 2010
Posts: 829
Likes: 190
2017 C43
Hello Guys,
I'm a new mercedes owner and I don't know if this thread has already been opened (did some searching but couldn't find a similar one).
I drive a 2010 E350 coupe, when I start the AC for the first time in the morning, the blown air is not cool at all, (as if the compressor did not start)
However with some throttle, it works just fine and continues to work until the car is off for a few hours, (I try it again after 9 hrs work) then the same issue happens again.
I did a gas vacuum and reinstalled gas, and changed some kind of a valve that is located on the compressor but the problem was not solved.
My local workshop suggested to replace the compressor but I would really appreciate ur advise before doing anything.
Thank you.
I'm a new mercedes owner and I don't know if this thread has already been opened (did some searching but couldn't find a similar one).
I drive a 2010 E350 coupe, when I start the AC for the first time in the morning, the blown air is not cool at all, (as if the compressor did not start)
However with some throttle, it works just fine and continues to work until the car is off for a few hours, (I try it again after 9 hrs work) then the same issue happens again.
I did a gas vacuum and reinstalled gas, and changed some kind of a valve that is located on the compressor but the problem was not solved.
My local workshop suggested to replace the compressor but I would really appreciate ur advise before doing anything.
Thank you.
Thread Starter
Newbie
Joined: Jun 2016
Posts: 12
Likes: 0
From: Lebanon\Beirut
E350 coupe 2010
Thank you mo11 for your reply,
Actually I tested what you suggested and I set the temperature to lo (the minimum) and still faced the same issue and on very hot days 30* + Celsius.
Actually I tested what you suggested and I set the temperature to lo (the minimum) and still faced the same issue and on very hot days 30* + Celsius.
Senior Member
Joined: Oct 2009
Posts: 269
Likes: 4
From: New York
03 SL500(Sold), 09 C300, 11 E550
um im confused. Doesn't every car take a little to get the ac blowing cold? i mean i've never owned a car where the ac temperatures are immediately cold as soon as i start the car on a blistering hot summer day?
How long does it take for the air to start blowing cold?
How long does it take for the air to start blowing cold?
Thread Starter
Newbie
Joined: Jun 2016
Posts: 12
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From: Lebanon\Beirut
E350 coupe 2010
you are right, the air cannot be cold immediately, but in my case u can easily notice that it's only regular air, As if only the ventilation is on and
It stays that way until you step on the gas fir 2-5 seconds (once I waited for 10 minutes)
It stays that way until you step on the gas fir 2-5 seconds (once I waited for 10 minutes)
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Senior Member
Joined: Oct 2009
Posts: 269
Likes: 4
From: New York
03 SL500(Sold), 09 C300, 11 E550
hmm okay so building revs causes the air to blow cold. The only item in the ac system that would be affected by the engine revving is the compressor since it is connected by the serpentine belt.
Next time you start up your car turn the ac on full blast and without touching the gas inspect to see if the compressor pulley is spinning with the clutch engaged ( the middle part of the pulley needs to be spinning not just the outside of the pulley where the belt is).
Its possible that the additional speed of the the serpentine belt engages the clutch in the compressor? or the clutch is worn out and it is slipping until the pulley spins a little faster? if you throw a camera on the compressor and record it from engine startup you should see the center of the pulley "Suck" into the compressor about 1mm or so when the clutch engages
We know that the AC works just not at startup... so i dont think you have a problem with the system charge. This does sound like a compressor problem to me.
Next time you start up your car turn the ac on full blast and without touching the gas inspect to see if the compressor pulley is spinning with the clutch engaged ( the middle part of the pulley needs to be spinning not just the outside of the pulley where the belt is).
Its possible that the additional speed of the the serpentine belt engages the clutch in the compressor? or the clutch is worn out and it is slipping until the pulley spins a little faster? if you throw a camera on the compressor and record it from engine startup you should see the center of the pulley "Suck" into the compressor about 1mm or so when the clutch engages
We know that the AC works just not at startup... so i dont think you have a problem with the system charge. This does sound like a compressor problem to me.
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Thread Starter
Newbie
Joined: Jun 2016
Posts: 12
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From: Lebanon\Beirut
E350 coupe 2010
Thank you Late,
I'll try to test it the way you explained ASAP.
I don't know how this can help but since I got the car (About 4 months ago) I used to turn of the AC before turning of the car, however during the past 3 days, I kept the AC on and I noticed that it starts with the car every time, I'm gonna test it the same way for few for more days to confirm that it's not a just coincidence since the problem does not occur every time. Maybe it's a dummy question but do you think that when the car starts there's actually more spinning or maybe more power given and that's why the compressor starts?
I'll try to test it the way you explained ASAP.
I don't know how this can help but since I got the car (About 4 months ago) I used to turn of the AC before turning of the car, however during the past 3 days, I kept the AC on and I noticed that it starts with the car every time, I'm gonna test it the same way for few for more days to confirm that it's not a just coincidence since the problem does not occur every time. Maybe it's a dummy question but do you think that when the car starts there's actually more spinning or maybe more power given and that's why the compressor starts?
Senior Member
Joined: Oct 2009
Posts: 269
Likes: 4
From: New York
03 SL500(Sold), 09 C300, 11 E550
Thank you Late,
I'll try to test it the way you explained ASAP.
I don't know how this can help but since I got the car (About 4 months ago) I used to turn of the AC before turning of the car, however during the past 3 days, I kept the AC on and I noticed that it starts with the car every time, I'm gonna test it the same way for few for more days to confirm that it's not a just coincidence since the problem does not occur every time. Maybe it's a dummy question but do you think that when the car starts there's actually more spinning or maybe more power given and that's why the compressor starts?
I'll try to test it the way you explained ASAP.
I don't know how this can help but since I got the car (About 4 months ago) I used to turn of the AC before turning of the car, however during the past 3 days, I kept the AC on and I noticed that it starts with the car every time, I'm gonna test it the same way for few for more days to confirm that it's not a just coincidence since the problem does not occur every time. Maybe it's a dummy question but do you think that when the car starts there's actually more spinning or maybe more power given and that's why the compressor starts?
During startup you will also have more electrical voltage ( i believe about 14.1 volts) before it goes back down to the running 12v. Basically the coil acts like a magnet that sucks the clutch into the pulley then it grabs the pulley and remains activated. So if it works at startup and when you are giving it revs i would actually lean toward it being an electrical issue where idle isnt producing enough power to turn the coil on
Last edited by Late; Jun 23, 2016 at 10:06 AM.
