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  #1  
Old 10-04-2011, 04:31 PM
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What does this vacuum line control? 89 300e

My poor car has been suffering from a vacuum leak. My mighty vac has narrowed it down to this line.

What does this vacuum line control? 89 300e-img_0876.jpg



Does anybody know what it controls?
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Eugene

89 300e w124 213k
98 BMW 540i/6 83k
93 300te 4matic 125k
07 BMW X3. 87k
08 mitsubishi fuso 16' box truck 78k
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  #2  
Old 10-04-2011, 05:02 PM
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the vacuum (economy) gauge on the cluster
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  #3  
Old 10-04-2011, 05:12 PM
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Thanks.... Gauge functions, but was showing low... I might have a small leak behind the cluster.

Could a leak like that cause the central lock to stop working, or am I just wishful thinking?
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Eugene

89 300e w124 213k
98 BMW 540i/6 83k
93 300te 4matic 125k
07 BMW X3. 87k
08 mitsubishi fuso 16' box truck 78k
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  #4  
Old 10-04-2011, 05:37 PM
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Update: The hose is all white. The line that attaches to the cluster is grey with a stripe. It is on the opposite side of the "w" connection.

This leaker is behind the cluster, but I only see about an inch of it.


Does anybody know what kind of vacuum pressure I should be seeing at idle? I was getting a reading of 15hg.
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Eugene

89 300e w124 213k
98 BMW 540i/6 83k
93 300te 4matic 125k
07 BMW X3. 87k
08 mitsubishi fuso 16' box truck 78k
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  #5  
Old 10-04-2011, 06:49 PM
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FYI
Idle in Park

And idle in Drive


The small vacuum hose going to the gauge should not greatly affect the running of the engine and has no affect on central locking.
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  #6  
Old 10-05-2011, 08:40 AM
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Looked like a grey line...

The other lines at the brake booster area, go to the A/C vacuum block & vacuum storage.

Central locking is done by a pump on that car.
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Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
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1986 190E 2.3 16V 2.5 (sold)
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  #7  
Old 10-05-2011, 10:25 AM
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Quote:
Originally Posted by mbdoc View Post
Looked like a grey line...

The other lines at the brake booster area, go to the A/C vacuum block & vacuum storage.

Central locking is done by a pump on that car.
Thanks doc. The ac vacuum block can be accessed via the glovebox?. Its been a while since I have been around there. Also, you say vacuum storage, I would be looking for a vacuum canister of sorts? Where would I locate that?
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Eugene

89 300e w124 213k
98 BMW 540i/6 83k
93 300te 4matic 125k
07 BMW X3. 87k
08 mitsubishi fuso 16' box truck 78k
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  #8  
Old 10-05-2011, 10:27 AM
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Join Date: Jul 2009
Location: cleveland
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Quote:
Originally Posted by Ivanerrol View Post
FYI
Idle in Park

And idle in Drive


The small vacuum hose going to the gauge should not greatly affect the running of the engine and has no affect on central locking.
My car at idle is a bit lower than what your car shows in drive. When it is in drive, it is almost at the halfway mark.....
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Eugene

89 300e w124 213k
98 BMW 540i/6 83k
93 300te 4matic 125k
07 BMW X3. 87k
08 mitsubishi fuso 16' box truck 78k
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  #9  
Old 10-06-2011, 02:59 AM
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Quote:
Originally Posted by lorainfurniture View Post
My car at idle is a bit lower than what your car shows in drive. When it is in drive, it is almost at the halfway mark.....
That particular car has '90 model 260e has 200,000 kilometres up and is in excellent condition. Head has not been lifted. (Still drives like a new car).
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