Found another leak

"MM54" (mm54mk2) 09/06/2016 at 22:01 • Filed to: None

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Well, this sucks (Ha! A vacuum pun!) - checked out the last of the things-that-use-vacuum in the Chevelle this evening after my plans to mow the lawn were rained out (again... going to have to bale it at this rate). Put the knock-off mighty-vac on the line that feeds the interior (HVAC) and... nothing. Could pump all day and it held no vacuum.

Guess the dash gets to come apart.

In other news, the brake booster doesn’t leak (which is good since it’s basically brand new) and the vacuum modulator on the transmission (and its line) also are leak-free. That means the interior is the only thing still leaking, unless I’ve got a bad gasket somewhere.

I’m tempted to disconnect the interior line and cap the T until I get the chance to pull the dash pad off. The weird thing is the controls inside still lead to creaky-vacuum-pod noises when you move them around with the engine running, so it’s not 100% open. Just leaky somewhere.

Boring picture I know, but who likes posts without at least one?

aberson Bresident of the FullyAssed Committe > MM54 09/06/2016 at 22:11

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Lol vacuum lines.

Now excuse me as I go fiddle with my 1970's Italian electronics.

crowmolly > MM54 09/06/2016 at 22:30

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Use low pressure compressed air and listen for the hiss?

MM54 > crowmolly 09/07/2016 at 07:40

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A lot of vacuum fittings are just pressed on, I can just imagine this popping them all off the little connectors! Shouldn’t be too bad to move connection-to-connection with the vacuum pump to find out which leg is leaking, though. Just have to get at the lines, etc.

crowmolly > MM54 09/07/2016 at 09:38

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I’ve done it with maybe 5-10 psi or so chasing leaks in a C3 vette, which is a vacuum nightmare.

Just an option if you get too frustrated I guess!

MM54 > crowmolly 09/07/2016 at 17:53

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I appreciate it! I guess with that low of a pressure it should be fairly safe. If pulling vacuum on individual components doesn’t do it, I’ll call for mega-maid!