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1999-2007 General Questions General questions related to 1999-2007 Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

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Old 02-25-2013, 03:43 PM   #1 (permalink)
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Vacuum Canister

Has anyone heard of the vacuum canister going bad?
My heater is on defrost only which usually means a vacuum leak plus my pump doesn't shut off. If I unplug the pump from the canister and put my finger over the tubing the pump stops. When I plug the pump into the inlet side of the canister and cover the outlet of the canister with my finger it doesn't stop.
I put Warn hubs on so I don't use the vacuum for my four wheel drive. Could I bypass the solenoid and canister just for the heat control or do I need one or both of them?
Thanks for any input.
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Old 02-26-2013, 08:12 AM   #2 (permalink)
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Sounds like you found the problem. Haven't heard of that, but you tracked it down quite well.
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Old 02-26-2013, 04:23 PM   #3 (permalink)
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It was the vacuum solenoid
Glad I checked twice before buying a black lunch box for nothing
Once you lose the vacuum in that canister it takes a minute to build back up and I diidn't wait long enough before jumping to the conclusion that it was the canister
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Last edited by Royaldiesel; 02-26-2013 at 04:26 PM.
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