Clearly this is some kind of vacuum pipe, but what is it it's purpose? Heater related?
Interesting the Real OEM depiction of where this pipe is attached to the manifold shows it as capped off, but mine has always had the pipe.
It came to my attention because I found that it had become detached. Could that explain the slight hunting that I've recently been experiencing during initial warm up?
Thin pipe from bottom of the inlet manifold into the passenger compartment?
Moderators: GRNSHRK, ron, bfons
Thin pipe from bottom of the inlet manifold into the passenger compartment?
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Phil
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1988 Highline 635 CSi
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1988 Highline 635 CSi
- hornhospital
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Re: Thin pipe from bottom of the inlet manifold into the passenger compartment?
It draws air from in the cabin to measure the temperature. It's the thermostat that controls the heat/AC. That thermostat is a small box mounted on the under dash panel on the left side.
Ken Kanne
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"
Re: Thin pipe from bottom of the inlet manifold into the passenger compartment?
Thanks. If air is being drawn through the thermostat on a constant basis does that imply that the engine would run just the same whether or not the pipe is connected?hornhospital wrote: ↑Mon Jul 27, 2020 2:51 pm It draws air from in the cabin to measure the temperature. It's the thermostat that controls the heat/AC. That thermostat is a small box mounted on the under dash panel on the left side.
I wonder why Real OEM suggests that for my chassis number the pipe is capped at the manifold end when clearly the car has a heater and A/C?
Phil
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1988 Highline 635 CSi
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1988 Highline 635 CSi
- 86_6series
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Re: Thin pipe from bottom of the inlet manifold into the passenger compartment?
IIRC on a 35B there are more ports under the IM
to connect the temp vacuum.
to connect the temp vacuum.
86-635CSi
96-MB C220 SOLD
98-740i
71-Continental MK3
96-MB C220 SOLD
98-740i
71-Continental MK3