Unhappy screeching noise / high pitched whistling noise in GL320 Bluetec
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GL 320 BlueTec 2009
Unhappy screeching noise / high pitched whistling noise in GL320 Bluetec
Hello, I'm new to this forum. Recently, I've purchased 2009 GL320 Blutec. It was all fine for a few miles and then I started hearing high pitched whistling / screeching sound from the engine. The dealer sold the car without warranty, so no point of going back to him (he is located in Another state, anyway). I showed the truck to a local mechanic. He charged $ 800 for replacing the drive belt tensioner, belt and some sort of pulleys. However, the sound still persists. Any clue ? The sound varies as per the speed ( and also while in neutral by raising the RPMs..so, its not a wind noise). Pl. help. I've already spent enough of money and cant drive properly because of this annoying noise. Thanks !
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From: Charlotte NC area
2019 WS222 S450 4-Matic / 2007 W211 E350 4Matic (Sold) / 2008 X164 GL320 CDI
Did it get any better or different when they changed the tensioner?
If you are not mechanically incline, I would search out a local independent shop with MB experience.
$800 For a drive belt and tensioner is outrageous. Are you sure that is all they did?
EDIT:
Noise from the front of the engine can be internal or an accessory.
Accessories include; Water pump, power steering pump, alternator, AC compressor, and a few idlers and the tensioner.
A quick test it to take off the serpentine belt and start the car briefly (very briefly as the water pump is not running)
If the noise is gone then you need to start playing with each of the above list and see if one (or more) does not feel right.
If the noise still exists you need to go in deeper.
If you are not mechanically incline, I would search out a local independent shop with MB experience.
$800 For a drive belt and tensioner is outrageous. Are you sure that is all they did?
EDIT:
Noise from the front of the engine can be internal or an accessory.
Accessories include; Water pump, power steering pump, alternator, AC compressor, and a few idlers and the tensioner.
A quick test it to take off the serpentine belt and start the car briefly (very briefly as the water pump is not running)
If the noise is gone then you need to start playing with each of the above list and see if one (or more) does not feel right.
If the noise still exists you need to go in deeper.
Last edited by N_Jay; May 30, 2014 at 03:22 PM.
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GL 320 BlueTec 2009
Thanks Jay,
Checked everything including belt, tensioner, alternator, water pump, compressor etc. found nothing. I suspect the noise is due to turbo exhaust, as I also smell some exhaust from the engine. The noise starts only when the engine is warmed up (after driving for few miles). I've taken an appointment with a dealer on Thursday. Anyone has clue, where I should ask them to start from (like sensor or something) ?? As, I've heard about dealer suggesting to replace to whole part like turbo or exhaust, even when its not required. I just wish to go there with some knowledge so, dealer doesn't hit me hard
Checked everything including belt, tensioner, alternator, water pump, compressor etc. found nothing. I suspect the noise is due to turbo exhaust, as I also smell some exhaust from the engine. The noise starts only when the engine is warmed up (after driving for few miles). I've taken an appointment with a dealer on Thursday. Anyone has clue, where I should ask them to start from (like sensor or something) ?? As, I've heard about dealer suggesting to replace to whole part like turbo or exhaust, even when its not required. I just wish to go there with some knowledge so, dealer doesn't hit me hard
Thread Starter
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GL 320 BlueTec 2009
The noise exists even if the car is parked. I've noticed that the noise starts only when the engine is warmed up. Appreciate, if anyone could help me with the steps on checking out Turbo and its exhaust,
Thanks Jay,
Checked everything including belt, tensioner, alternator, water pump, compressor etc. found nothing. I suspect the noise is due to turbo exhaust, as I also smell some exhaust from the engine. The noise starts only when the engine is warmed up (after driving for few miles). I've taken an appointment with a dealer on Thursday. Anyone has clue, where I should ask them to start from (like sensor or something) ?? As, I've heard about dealer suggesting to replace to whole part like turbo or exhaust, even when its not required. I just wish to go there with some knowledge so, dealer doesn't hit me hard
Checked everything including belt, tensioner, alternator, water pump, compressor etc. found nothing. I suspect the noise is due to turbo exhaust, as I also smell some exhaust from the engine. The noise starts only when the engine is warmed up (after driving for few miles). I've taken an appointment with a dealer on Thursday. Anyone has clue, where I should ask them to start from (like sensor or something) ?? As, I've heard about dealer suggesting to replace to whole part like turbo or exhaust, even when its not required. I just wish to go there with some knowledge so, dealer doesn't hit me hard
Thread Starter
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GL 320 BlueTec 2009
Out Of Control!!
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From: Charlotte NC area
2019 WS222 S450 4-Matic / 2007 W211 E350 4Matic (Sold) / 2008 X164 GL320 CDI
Why is that a stupid suggestion?
(Are maybe the question is; "why is any stupider than asking people here to guess what problem you are having and providing the steps for you?")
(Are maybe the question is; "why is any stupider than asking people here to guess what problem you are having and providing the steps for you?")
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From: In my garage
E55, GLS450, GL63, GLE350
nir08, you may not be very familiar with cars or equipment so I think your quip may have been centered around ignorance. There is an automotove stethoscope you can use to determine where the noise is located. Do a quick search on the internet and buy one. Just be careful with the rotating pieces and parts of the engine so you don't get hurt.
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GL 320 BlueTec 2009
I sincerely apologize Jay...I didn't know about automotive stethoscope and I assumed you were just making fun of my question. Sorry..I generally try with our regular screw driver, if I want to check out the noise and had no clue about this type of stethoscope. You tried to help me and i got offended. Very sorry about it.
Update: Yesterday, check engine light came on with P0426 code ( Catalyst Temp Sensor Range/Performance Bank 1). I'm pissed of
Update: Yesterday, check engine light came on with P0426 code ( Catalyst Temp Sensor Range/Performance Bank 1). I'm pissed of
Out Of Control!!
Joined: Aug 2010
Posts: 12,516
Likes: 628
From: Charlotte NC area
2019 WS222 S450 4-Matic / 2007 W211 E350 4Matic (Sold) / 2008 X164 GL320 CDI
Since the car is new to you, you need to get it sorted out by someone you trust.
Where are you located?
Where are you located?
Out Of Control!!
Joined: Aug 2010
Posts: 12,516
Likes: 628
From: Charlotte NC area
2019 WS222 S450 4-Matic / 2007 W211 E350 4Matic (Sold) / 2008 X164 GL320 CDI
Try asking here;
https://mbworld.org/forums/tri-state...nnecticut-153/
Or maybe here:
https://mbworld.org/forums/mid-atlantic-121/
https://mbworld.org/forums/tri-state...nnecticut-153/
Or maybe here:
https://mbworld.org/forums/mid-atlantic-121/
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From: California
2010 GL350, 2005 BMW X5 4.8is, 2015 BMW 328d
Thanks Jay,
Checked everything including belt, tensioner, alternator, water pump, compressor etc. found nothing. I suspect the noise is due to turbo exhaust, as I also smell some exhaust from the engine. The noise starts only when the engine is warmed up (after driving for few miles). I've taken an appointment with a dealer on Thursday. Anyone has clue, where I should ask them to start from (like sensor or something) ?? As, I've heard about dealer suggesting to replace to whole part like turbo or exhaust, even when its not required. I just wish to go there with some knowledge so, dealer doesn't hit me hard
Checked everything including belt, tensioner, alternator, water pump, compressor etc. found nothing. I suspect the noise is due to turbo exhaust, as I also smell some exhaust from the engine. The noise starts only when the engine is warmed up (after driving for few miles). I've taken an appointment with a dealer on Thursday. Anyone has clue, where I should ask them to start from (like sensor or something) ?? As, I've heard about dealer suggesting to replace to whole part like turbo or exhaust, even when its not required. I just wish to go there with some knowledge so, dealer doesn't hit me hard
1.Exhaust Manifold Leak. 2 gaskets~$20/pair. + labor
2.Turbocharger Exhaust Collector Pipe leak. 2 gaskets~ $9.00/pair + labor
3.O2 sensor leak. $23 + Labor
http://www.mbpartsworld.com/showAsse...sembly=1079902
Last edited by drgeeforce; Jun 11, 2014 at 01:53 PM.
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13 GL350, 14 SL550
Are you sure it isn't the A/C?
Mine has a high pitched whine/whistle and the problem is these trucks came with A/C pulleys that fail. You can replace the pulley ($180 part) and it's difficult, or the entire compressor ($450 part) and it's easier.
To test, make SURE the A/C is off and see if the noise goes away.
The reason I say that in caps is nobody knows how to turn off the A/C properly in these trucks
Pushing the AC button so the light is off does NOT turn off the compressor. You need to turn the AC off first, then push the off button on the entire climate control. Then the AC stops running.
So hold your truck at 1200-1800rpm or so on the road or in park (wherever you hear the noise, but mine is somewhere around there). While doing so, listen for the whine, shut the AC button off, then shut the climate control completely off.
If the noise goes away, let me know and I will send you the document on replacing the pulley.
Mine has a high pitched whine/whistle and the problem is these trucks came with A/C pulleys that fail. You can replace the pulley ($180 part) and it's difficult, or the entire compressor ($450 part) and it's easier.
To test, make SURE the A/C is off and see if the noise goes away.
The reason I say that in caps is nobody knows how to turn off the A/C properly in these trucks
Pushing the AC button so the light is off does NOT turn off the compressor. You need to turn the AC off first, then push the off button on the entire climate control. Then the AC stops running.
So hold your truck at 1200-1800rpm or so on the road or in park (wherever you hear the noise, but mine is somewhere around there). While doing so, listen for the whine, shut the AC button off, then shut the climate control completely off.
If the noise goes away, let me know and I will send you the document on replacing the pulley.
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short story - you have the a/c button "off" - the ac compressor is not turning as the button is necessary but insufficient requirement for the ac clutch to engage
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13 GL350, 14 SL550
the ac clutch signal is manipulated directly via the ac button on the dash. once activated the ecu decides when to disengage and re-engage the clutch based on evap coil temp, refrigerant temp and other things.
short story - you have the a/c button "off" - the ac compressor is not turning as the button is necessary but insufficient requirement for the ac clutch to engage
short story - you have the a/c button "off" - the ac compressor is not turning as the button is necessary but insufficient requirement for the ac clutch to engage
MB specifically says when you are diagnosing pulley noises to do exactly what I said above. They tell you to shut off the A/C and then shut off the entire system.
On mine, the pulley keeps whining after you shut off the A/C. As soon as you shut off the entire system, it stops.
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Although the clutch disengages, something is still spinning until you shut the system off. The pulley/clutch/compressor on this truck is a bit unique so it operates differently than others.
MB specifically says when you are diagnosing pulley noises to do exactly what I said above. They tell you to shut off the A/C and then shut off the entire system.
On mine, the pulley keeps whining after you shut off the A/C. As soon as you shut off the entire system, it stops.
MB specifically says when you are diagnosing pulley noises to do exactly what I said above. They tell you to shut off the A/C and then shut off the entire system.
On mine, the pulley keeps whining after you shut off the A/C. As soon as you shut off the entire system, it stops.
mb specifically says to shut off the climate control altogether for simplicity of following rules in the field and to rule out the compressor lock out period.
the a/c button does just what it is supposed to do. there is no trickery there if you are not hitting the lock out period
Last edited by alx; Jun 20, 2014 at 10:49 AM.
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GL 320 BlueTec 2009
Thanks..
P042X Exhaust Catalyst, therefore:
1.Exhaust Manifold Leak. 2 gaskets~$20/pair. + labor
2.Turbocharger Exhaust Collector Pipe leak. 2 gaskets~ $9.00/pair + labor
3.O2 sensor leak. $23 + Labor
http://www.mbpartsworld.com/showAsse...sembly=1079902
1.Exhaust Manifold Leak. 2 gaskets~$20/pair. + labor
2.Turbocharger Exhaust Collector Pipe leak. 2 gaskets~ $9.00/pair + labor
3.O2 sensor leak. $23 + Labor
http://www.mbpartsworld.com/showAsse...sembly=1079902
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2008 mercedes-benz gl 320
2008 mercedes-benz gl 320 cdi x164
I’m having the same issue I think whine noise then smell exhaust drive it 20 mins both goes away. What did u come up with
QUOTE=nir08;6059095]Thanks Jay,
Checked everything including belt, tensioner, alternator, water pump, compressor etc. found nothing. I suspect the noise is due to turbo exhaust, as I also smell some exhaust from the engine. The noise starts only when the engine is warmed up (after driving for few miles). I've taken an appointment with a dealer on Thursday. Anyone has clue, where I should ask them to start from (like sensor or something) ?? As, I've heard about dealer suggesting to replace to whole part like turbo or exhaust, even when its not required. I just wish to go there with some knowledge so, dealer doesn't hit me hard[/QUOTE]
QUOTE=nir08;6059095]Thanks Jay,
Checked everything including belt, tensioner, alternator, water pump, compressor etc. found nothing. I suspect the noise is due to turbo exhaust, as I also smell some exhaust from the engine. The noise starts only when the engine is warmed up (after driving for few miles). I've taken an appointment with a dealer on Thursday. Anyone has clue, where I should ask them to start from (like sensor or something) ?? As, I've heard about dealer suggesting to replace to whole part like turbo or exhaust, even when its not required. I just wish to go there with some knowledge so, dealer doesn't hit me hard
[/QUOTE]
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From: Allentown, PA
'08 GL 320 CDI
[QUOTE=Lamont Clemons;8479528]I’m having the same issue I think whine noise then smell exhaust drive it 20 mins both goes away. What did u come up with
QUOTE=nir08;6059095]
Lamont - read through the entire thread. There's good info in there and the OP mentioned the fix, as well.
QUOTE=nir08;6059095]
Lamont - read through the entire thread. There's good info in there and the OP mentioned the fix, as well.
