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Vacuum check valve: What is sensor "downstream' of it? 900 1991

posted by  JockWagon on  Thu Jun 30 10:14 CST 2011
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last visit: Mon Dec 3 10:56 CST 2012
[RELATED]

Trying to fix a vacuum leak. For this and other reasons I have taken off much of the interior plastics below the dash, so: While it's in this state what is the sensor between the black and white check valve and the firewall, and how do I tell it's working? It goes thru the middle of the dash for some HVAC pupose.

The check valve seems to work fine; cleaned with WD-40 as mentioned here. Getting less out of the panel vents under load (A/C or no A/C).

945T and (unless I totally miss my guess) with MCC.






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