Smoke/vapor from vent tube.

[Mopar1973Man]

Thanks for reporting back on the fix. I would consider replacing the one-way check valve on the system it should hold up better then.

[Unreal Summit]

Would the one way check valve be the round diaphragm that comes off the main line of the vacuum pump

[Mopar1973Man]

2 hours ago, Unreal Summit said:

Would the one way check valve be the round diaphragm that comes off the main line of the vacuum pump

 

Something like this...

[Unreal Summit]

Yea that's it. I'll replace that while I am at it

[Mopar1973Man]

That should help holding the vacuum in the reservoir in the cowl area. 

[dripley]

2 hours ago, Mopar1973Man said:

That should help holding the vacuum in the reservoir in the cowl area. 

I have to ask, what resevoir? Never seen one on mine. 

 

Mine defauts to the defrost very quickly. Never gave it much thought since it seems to have done that for a very long time. Thought it was like that new but 17.5 years is long time to remember back. Also thought it might just be that check valve. Its 17.5 years old too. Does the vacuum pump have a check valve in it to hold vacuum? I don't remember such when I resealed mine.

Edited May 30, 2019 by dripley

[Mopar1973Man]

38 minutes ago, dripley said:

I have to ask, what resevoir? Never seen one on mine. 

 

Maybe its only on the early series of trucks I've for sure seen it on my 1996. 

[dripley]

Mine runs to the manifold at the cowl but no resevoir that is visible. thats why I asked. I am still finding surprises with the truck so I dont write anything off.