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02-13-2022, 04:04 PM
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#1
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Senior Member
Winnebago Owners Club
Join Date: Mar 2011
Location: Fairfield, CA
Posts: 771
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Location of vacuum pump
Once again, I'm trying to locate the vacuum pump that operates the dash heater in line valve. In this pic, is it either the round ball looking thing at the top left of pic or the small round thing at the bottom right of pic with a hose coming out of it vertically?
My issue is when I need heat or air I have to go outside and zip tie the valve in one position or the other. I've replaced the dash control unit. 
__________________
Barry & Sue Miller("extended" RVer's, 6 mos + per/year) combined trips.
04 Journey 39K, C-7, 330 hp, towing: 13 Ford Edge AWD, or 19 GMC Canyon 4WD, ReadyBrake.
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02-13-2022, 04:16 PM
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#2
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Senior Member
Winnebago Owners Club
Join Date: Jun 2013
Location: Full-timer/volunteer w/SOWERS
Posts: 3,958
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Quote:
Originally Posted by doorguy
Once again, I'm trying to locate the vacuum pump that operates the dash heater in line valve. In this pic, is it either the round ball looking thing at the top left of pic or the small round thing at the bottom right of pic with a hose coming out of it vertically?
My issue is when I need heat or air I have to go outside and zip tie the valve in one position or the other. I've replaced the dash control unit. Attachment 356430 |
I think if you follow the line out of that black ball (vacuum chamber) you will find your pump location. I had a dash air problem on my first coach. A small link hose had rotted off.
__________________
Rick & Melissa Young, 2011 Itasca Meridian 40U, Frtliner XCL, Cummins ISL 380HP/DEF, Allison 3000 MH, 2014 Honda CR-V, SMI AF1, Blue Ox, EEZ TPMS, TruCenter steering control
Servants On Wheels Ever Ready. Best job we ever paid to do  . (full time volunteers)
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02-13-2022, 04:20 PM
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#3
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Senior Member
Join Date: Dec 2009
Location: Out there, somewhere
Posts: 9,941
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Hey Barry,
Yes, the "ball" is a vacuum chamber. It's soul job is to STORE vacuum so it can be supplied at times when the vacuum pump cannot put out what's needed for various operations. As to your actual vacuum pump, yes, it's not a very big item in the front of our coaches. If you have the CEO turn the ignition key on while you're standing in front, you'll instantly verify just which component is your pump. Normally, it's a small little unit with one or two wires leading to it and of course, at least one hose emanating from it.
Scott
__________________
2004 ITASCA HORIZON 36GD, 2011 GMC Sierra 1500 4x4 Toad '20 Honda NC750X DCT
 2018 Goldwing Tour DCT Airbag
Retired-29.5 yrs, SDFD, Ham - KI6OND
Me, Karla and the Heidi character, (mini Schnauzer)!
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02-13-2022, 06:58 PM
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#4
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Senior Member
Winnebago Owners Club
Join Date: Mar 2011
Location: Fairfield, CA
Posts: 771
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Scott, good to hear from you. I will have the CEO turn the key for me tomorrow and listen. Thanks for the advice, sir! We r in Yuma for 10 days or so.
__________________
Barry & Sue Miller("extended" RVer's, 6 mos + per/year) combined trips.
04 Journey 39K, C-7, 330 hp, towing: 13 Ford Edge AWD, or 19 GMC Canyon 4WD, ReadyBrake.
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02-14-2022, 09:36 AM
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#5
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Senior Member
Join Date: Dec 2009
Location: Out there, somewhere
Posts: 9,941
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Hey Barry,
Roger that. IF we get maybe a chance, we'll take an m/c ride down to Yuma and maybe meet up for a beer/coke etc.
Scott
__________________
2004 ITASCA HORIZON 36GD, 2011 GMC Sierra 1500 4x4 Toad '20 Honda NC750X DCT
2018 Goldwing Tour DCT Airbag
Retired-29.5 yrs, SDFD, Ham - KI6OND
Me, Karla and the Heidi character, (mini Schnauzer)!
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02-14-2022, 09:47 AM
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#6
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,451
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Following the rubber hose ( yellow arrow ) should lead you to the vacuum pump .
But if your issue is only dash heat temp ( assuming vacuum coolant flow valve ) and the system inside cycles from defrost to , vent and floor . Vacuum supply is not the problem .
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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02-22-2022, 06:42 PM
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#7
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Senior Member
Winnebago Owners Club
Join Date: Jul 2011
Location: Beaverton, Oregon
Posts: 100
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If it is like my 2000 Workhorse 7.4 L, you will find that the vacuum supplied to the ball comes from the manifold vacuum. There is no "vacuum pump".
__________________
2001 Winnebago Brave SE 26P
Workhorse, P32, 7.4L
2000 chassis, SuperSteer springs
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02-22-2022, 07:29 PM
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#8
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Aug 2005
Location: Nashua, NH
Posts: 2,689
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Quote:
Originally Posted by NormD
If it is like my 2000 Workhorse 7.4 L, you will find that the vacuum supplied to the ball comes from the manifold vacuum. There is no "vacuum pump".
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On a diesel like the OP's Journey there is no 'manifold vacuum', hence the need for a vacuum pump for the HVAC controls.
__________________
Chris Beierl
2005 Winnebago Vectra 36RD
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Linear Mode
