Moisture in vacuum lines?

JHZR2

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Ive started to try to dig in more into my S-10 vacuum system, since the hoses are all good (replaced two small sections that are dry rotted).

Will probably put a separate thread on that...

but when I was looking at the vacuum differential actuator, I found water in the tube going to it... and white wet gunk, I think the mold release agent from the tubing.

9A6046BE-447D-4336-9713-B3627DBE5649.jpeg
FCB34E05-D177-4713-AD01-0ED1D9AB99EE.jpeg
41206EE7-6ABC-49DD-9723-B9C1FE0BF2C7.jpeg
033CDBED-9C03-40D1-9F15-81755B558739.jpeg

(Last pic is white gunk and water that I shook out of the line).

Vacuum goes I believe from intake to a set of connectors, to a switch, to this item. There’s no cross contamination of anything, no moisture in the oil, no loss of coolant, etc.

The line holds vacuum if I pull vac on it with a mityvac.
BEF0FF10-1E13-4258-A3D4-6D57DB024F2D.jpeg


So any idea how/why? Id think if anything vacuum woukd cause moisture to boil out. Granted limited use of 4wd woukd resukt in no vacuum there.... that said, vacuum is getting there, which is why my diff is grinding. So any ideas?

thanks!
 
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