What does this do?

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cpg003
Dernburg Wagon
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Joined: Fri 06 Apr, 2018 7:34 am
Model you own: w107
Region: Western Australia
Location: North Perth

What does this do?

Post by cpg003 » Mon 11 Jun, 2018 9:14 am

Morning all,

Can anyone give me some clarification of what this is and what it does? It’s mounted underneath the coolant reservoir of my C107 and has two vacuum lines and an electrical connection attached. Thanks in advance.

Ignore the writing on this one, just a pic I found on eBay.
Pierburg Vientil pressure regulator DB2097 ZK 12982 8171
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1979 450 SLC - C107 - Milan Brown
2017 220d GLC - W253 - Polar White

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John Green
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Re: What does this do?

Post by John Green » Mon 11 Jun, 2018 6:49 pm

Idle speed adjustment when the A/C compressor cuts in. It interrupts the vacuum to the ignition distributor.
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cpg003
Dernburg Wagon
Posts: 8
Joined: Fri 06 Apr, 2018 7:34 am
Model you own: w107
Region: Western Australia
Location: North Perth

Re: What does this do?

Post by cpg003 » Mon 11 Jun, 2018 7:57 pm

Thanks John. Much appreciated.
1979 450 SLC - C107 - Milan Brown
2017 220d GLC - W253 - Polar White

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Chai
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Joined: Fri 04 Nov, 2005 11:49 am
Model you own: w107
Location: Melbourne

Re: What does this do?

Post by Chai » Wed 04 Jul, 2018 8:28 pm

Those with too much time on their hands can clean the very fine metal mesh that acts as an air filter in that part. The filter is located at the top of the unit (yellow looking item in the photo).

The filter in my 40-ish year old unit was partially clogged with dust. The tip of a needle can be used to poke out the debris (I did say ... too much time in my hands).

The air-leak to the vacuum line connected to the distributor when the air-conditioner is switched results in the cancellation of the distributor retard (i.e ignition is advanced and engine revs up).
Chai
1974 450SLC

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