W201 190d 2.5 errant red wire

[190dRC]

Hello, first post. Hope this all finds you well. I’ve been cleaning my engine bay, replaced the crumbling foam insulation and hoovered out the bits inside the bay too (not from removal as I put a sheet over as I was removing). Anyway, I found this errant red pipe/wire/vacuum hose? And don’t know where it goes or what it does. Can anyone please enlighten me? Thank you.

 

[Dodipops]

Can’t go to far as it’s fairly short and tied to the other pipes. What about the solenoid I can see under the wiper scuttle, is it some kind of coolant valve

 

[grober]

Can’t go to far as it’s fairly short and tied to the other pipes. What about the solenoid I can see under the wiper scuttle, is it some kind of coolant valve

Well spotted - the heater hotwater valve you mentioned is vacuum operated-the vacuum line is attached to the actuator diaphragm by a short pipe on the top -see picture

here's a video

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[190dRC]

Fabulous, thank you both. I did feel that and wondered if something needed to be connected to the top. I will try that today. Not hopeful on getting vacuum though as rubber has perished. I will let you know how I get on.

 

[grober]

HERE'S A PARTS DIAGRAM
HEATING/AIR-CONDITIONER VACUUM PARTS MERCEDES 190 [Car] [CHASSIS] (EUROPA)
As you say the short length of vac pipe is probably unuseable, but don't thro it away just yet use it as a model for any replacement
ITEM A1170780581 MIGHT FIT THE BILL?
Genuine Mercedes Benz Vacuum Hose A1170780581 for sale

 

[190dRC]

That’s the badger! Thank you. Got one arriving Wednesday.

 

[190dRC]

All fitted today. Thanks all.