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Recirc vacuum leak? Whistling 900

posted by  HillBilly on  Tue Dec 10 09:22 CST 2013
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last visit: Thu Oct 16 08:26 CST 2014
[RELATED]

My guess is that you have a crack in a rubber vacuum hose inside the dash.
Either that or one of the vacuum operators has a small leak.

To trouble shoot, I install a vacuum gage in the vacuum hose that's located on the firewall.
This line has a vacuum check valve installed and goes to the heater controls under the dash.
The check valve looks like a small Oreo cookie with a small rubber hose into and out of it.
Place the vacuum gage in the rubber line on the heater side of the check valve, that way, the check valve will hold vacuum on the system after you stop the engine.

Watch the gage after you stop the engine.
If it leaks down, you have a vacuum leak in the line or under the dash.

Hope this helps
steve






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