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Vacuum coolant switch??
https://forums.tipec.net/viewtopic.php?f=25&t=19256		 Page 1 of 1
Author:  Eltel [ Sun Feb 01, 2015 7:59 pm ]
Post subject:  Vacuum coolant switch??
Evening all

So today I began stripping the engine on the 944 for head gasket replacement and various other jobs,
When I removed the intake manifold I came across a switch of some sort with two vacuum pipes connected ,located at the rear of the head in a coolant elbow just before the heater valve.
Can someone shed some light on what this is and how to test if it works or not?

Any help would be great

Tel
Author:  jmgarage [ Sun Feb 01, 2015 8:10 pm ]
Post subject:  Re: Vacuum coolant switch??
its for emissions and the fuel tank breather system, it switches a vacuum signal based on heat in the coolant so the fuel tank vents at the right times.
Author:  Eltel [ Sun Feb 01, 2015 8:17 pm ]
Post subject:  Re: Vacuum coolant switch??
jmgarage wrote:
its for emissions and the fuel tank breather system, it switches a vacuum signal based on heat in the coolant so the fuel tank vents at the right times.

Ahh ok is this to do with a carbon filter in the wheel arch that I have read about ?
Author:  jmgarage [ Sun Feb 01, 2015 8:36 pm ]
Post subject:  Re: Vacuum coolant switch??
Yessum :)
Author:  Eltel [ Sun Feb 01, 2015 9:34 pm ]
Post subject:  Re: Vacuum coolant switch??
jmgarage wrote:
Yessum :)

Is there a way to test if this works or not as I noticed that I have some sort of crap leaking from behind
The wheel arch,I've yet to check it out
Author:  jmgarage [ Mon Feb 02, 2015 1:19 am ]
Post subject:  Re: Vacuum coolant switch??
The carbon canister should cause no crap to leak out.

The bulkhead drains leak out there though, so the only thing which should drain down there is any rain water which collects near the fuse box.
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