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What does this do?

Posted: Mon 11 Jun, 2018 10:14 am
by cpg003
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
76F15FF3-A1F6-4F92-8CAA-FE2350225281.jpeg

Re: What does this do?

Posted: Mon 11 Jun, 2018 7:49 pm
by John Green
Idle speed adjustment when the A/C compressor cuts in. It interrupts the vacuum to the ignition distributor.

Re: What does this do?

Posted: Mon 11 Jun, 2018 8:57 pm
by cpg003
Thanks John. Much appreciated.