Shakes with A/C on - Mercedes-Benz Forum
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post #1 of 13 (permalink) Old 06-25-2019, 03:47 PM Thread Starter
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Date registered: Mar 2019
Vehicle: 1998 ML320 (W163)
Location: Gulfport, MS
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Truck Shakes Only with A/C on

I recharged my 98 Ml's A/C yesterday, it's not anywhere near as cold as I was expecting it to be, although a lot colder than before. Also the low pressure line doesn't sweat like I've heard it should. But whenever it's on it makes the truck noticeably vibrate when below 1500 RPM, is this normal or would I have accidentally overcharged the system? I don't remember it vibrating before I recharged it, although it may have. The auxiliary fans do intermittently turn on and the compressor is spinning.

Last edited by leeadrian75; 06-26-2019 at 08:41 AM.
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post #2 of 13 (permalink) Old 06-26-2019, 09:33 AM
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Maybe you're lacking oil in the system, or even too much? There needs to be some in there. There also needs to be little or no water. Also, there may be regular air in there if you didn't have it vacuumed out...however if the system was always under pressure before you refilled it, it should not have air.

Also, the ML doesn't have a valve to turn off hot coolant supply to the heater core. I remember reading a thread of a guy who modified it with a valve or bypass and if I recall correctly he got another 7 or 8 degrees lower temp coming out of his vents.

Maybe the added load of the compressor is causing a miss from a weak ignition system. Something of that sort. Or even worn out engine mounts, though as they get old they can get stiff.

I would do a forum and Google search with ML/w163 as a keyword and then just a general search for all cars.

You could always let out a little refrigerant and see.

Or call a car HVAC specialist.

Good luck.
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post #3 of 13 (permalink) Old 06-26-2019, 01:30 PM Thread Starter
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Quote:
Originally Posted by Spenser Dsd Mo View Post
Maybe you're lacking oil in the system, or even too much? There needs to be some in there. There also needs to be little or no water. Also, there may be regular air in there if you didn't have it vacuumed out...however if the system was always under pressure before you refilled it, it should not have air.

Also, the ML doesn't have a valve to turn off hot coolant supply to the heater core. I remember reading a thread of a guy who modified it with a valve or bypass and if I recall correctly he got another 7 or 8 degrees lower temp coming out of his vents.

Maybe the added load of the compressor is causing a miss from a weak ignition system. Something of that sort. Or even worn out engine mounts, though as they get old they can get stiff.

I would do a forum and Google search with ML/w163 as a keyword and then just a general search for all cars.

You could always let out a little refrigerant and see.

Or call a car HVAC specialist.

Good luck.
The engine mounts are in good condition, I'm pretty sure it still had some pressure in it whenever I recharged it, just not much. About how much pressure should it have on the low side? I filled it up to, I think, 40 PSI. If it's any help I used this recharge kit: https://shop.advanceautoparts.com/p/...-1v/11917722-P

My blender door also, occasionally, makes the famous clicking sound from behind the dash but as of right now it's set on full cold and recirculate and it's not clicking.
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post #4 of 13 (permalink) Old 06-26-2019, 02:04 PM
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Oh I also wana say that sometimes the engine running rough can be from a vacuum leak somewhere, especially at the EGR valve at the back. There is at least one vacuum line behind and sorta underneath that you have to feel or see with a mirror.

Oh, also it might all just be you... the design of the V6 engine is naturally not very smooth, (one of the unsmoothest running engine configurations) ...and like I said the w163 doesn't have a heater core valve like every other MB which means hot coolant is heating the a/c core lol.

I've never ridden in a 98 w163 but it might just have those problems. They changed some stuff by 99 and my 99 sucks, which is why they had to pretty much replace everything on the 00 more 01 and more 02...

Oh also seeing water condense on one of the lines is based on the dew point so it just might not be high enough to see it.
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post #5 of 13 (permalink) Old 06-26-2019, 02:17 PM
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Gee some how I cant post links or something.

Go to Goo gle and search

w163 refrigerant pressure

And click on the the first Benz forum one for a good pd f for trouble shooting.

Also click around I found the answer and someone saying pressure cant tell you how much is in there, only weight can. He seemed to imply that was more true if there is air in there.
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post #6 of 13 (permalink) Old 06-26-2019, 02:38 PM Thread Starter
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Quote:
Originally Posted by Spenser Dsd Mo View Post
Oh I also wana say that sometimes the engine running rough can be from a vacuum leak somewhere, especially at the EGR valve at the back. There is at least one vacuum line behind and sorta underneath that you have to feel or see with a mirror.

Oh, also it might all just be you... the design of the V6 engine is naturally not very smooth, (one of the unsmoothest running engine configurations) ...and like I said the w163 doesn't have a heater core valve like every other MB which means hot coolant is heating the a/c core lol.

I've never ridden in a 98 w163 but it might just have those problems. They changed some stuff by 99 and my 99 sucks, which is why they had to pretty much replace everything on the 00 more 01 and more 02...

Oh also seeing water condense on one of the lines is based on the dew point so it just might not be high enough to see it.
Well, it only shakes with the A/C running and at idle, any other time it doesn't shake at all. So it has to have something to do with the A/C, because apart from that the engine is actually very smooth, only has 108K miles on it.
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post #7 of 13 (permalink) Old 06-26-2019, 02:41 PM Thread Starter
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Quote:
Originally Posted by Spenser Dsd Mo View Post
Gee some how I cant post links or something.

Go to Goo gle and search

w163 refrigerant pressure

And click on the the first Benz forum one for a good pd f for trouble shooting.

Also click around I found the answer and someone saying pressure cant tell you how much is in there, only weight can. He seemed to imply that was more true if there is air in there.
I actually tried looking at that article and it didn't make too much sense to me. Could you possibly direct me to what I'm supposed to be looking at?
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post #8 of 13 (permalink) Old 06-26-2019, 04:33 PM Thread Starter
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Quote:
Originally Posted by Spenser Dsd Mo View Post
Gee some how I cant post links or something.

Go to Goo gle and search

w163 refrigerant pressure

And click on the the first Benz forum one for a good pd f for trouble shooting.

Also click around I found the answer and someone saying pressure cant tell you how much is in there, only weight can. He seemed to imply that was more true if there is air in there.
This is what the pressure gauge says
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post #9 of 13 (permalink) Old 06-26-2019, 06:53 PM
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Originally Posted by leeadrian75 View Post
This is what the pressure gauge says
What that gauge shows you can shove deep in your rectum. Until you read both hi and lo pressures side by side with engine off after overnight rest then at idle then at 2000rpm you are in the dark.

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post #10 of 13 (permalink) Old 06-26-2019, 06:55 PM Thread Starter
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Originally Posted by Witek_M View Post
What that gauge shows you can shove deep in your rectum. Until you read both hi and lo pressures side by side with engine off after overnight rest then at idle then at 2000rpm you are in the dark.
Are you suggesting taking it somewhere to get the A/C tested?
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