CL-Class (W215) 2000-2006: CL 500, CL 600

Cl500 hissing sound, and trunk problem

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Old May 9, 2022 | 03:14 PM
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Cl500 w215 R320 w251
Cl500 hissing sound, and trunk problem

Hello guys!
I'm starting restoring
my 2003 Cl500, and i need to figure out a couple of things.
the first issue is hissing sound from the front of a car, it started after replacing the pulsation dampener, i've read about it here at the forum, that the valve needs to be repaired. And now my question is, is it the front valve? Back of the car goes low after a couple of nights, and i thought that the rear valve needs to be repaired
Next thing is the hydraulic trunk lid issue. I have replaced the cylinders a year ago and it was opening normally, and now it goes up only in the right side, like before replacing the cylinders, and it needs a little pull to open. Also when it closes, the right side goes lower than the left side, can it be regulated somehow? I have replaced the oil in the pump, and don't know what could i do more.
Please help

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Old May 11, 2022 | 03:09 AM
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Cl500 w215 R320 w251
Originally Posted by D.militaria
Hello guys!
I'm starting restoring
my 2003 Cl500, and i need to figure out a couple of things.
the first issue is hissing sound from the front of a car, it started after replacing the pulsation dampener, i've read about it here at the forum, that the valve needs to be repaired. And now my question is, is it the front valve? Back of the car goes low after a couple of nights, and i thought that the rear valve needs to be repaired
Next thing is the hydraulic trunk lid issue. I have replaced the cylinders a year ago and it was opening normally, and now it goes up only in the right side, like before replacing the cylinders, and it needs a little pull to open. Also when it closes, the right side goes lower than the left side, can it be regulated somehow? I have replaced the oil in the pump, and don't know what could i do more.
Please help
OK, trunk problem solved, one of the right hinge screws was loose, and it was higher than the left one.
Still need an advice about the hissing from the front of the car, and rear going down. If anyone has any ideas, please help.
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Old May 12, 2022 | 04:28 AM
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CL 600 '00 5.8L V12
Did you do a vacuum leak check?
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Old May 30, 2022 | 01:44 PM
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Cl500 w215 R320 w251
Originally Posted by tim687
Did you do a vacuum leak check?
Hi, no, can you tell me something more, how to do it?
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Old May 30, 2022 | 01:47 PM
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Cl500 w215 R320 w251
The hissing sound stops when the car is going up or down after pressing the abc button. Any ideas? Pump, accumulator? The nearest workshop that repairs abc systems is 300km from me, so i'd like to try doing it myself.
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Old May 30, 2022 | 01:53 PM
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CL 600 '00 5.8L V12
That sounds like an ABC problem to me, checkout the various threads on the ABC system on this and other forums. I think one of them listed a hissing sound too
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