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01-27-2021, 12:04 PM
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#1
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Junior Member
Join Date: Apr 2019
Posts: 8
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Need help with a vacuum line
I have 1 97 f53 with 7.5L engine, I found this red vacuum line that's not hooked to anything but has vacuum. Does anyone know where it connects? It's on the passenger side of engine and looks like it connects to something under the intake hose
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01-27-2021, 12:51 PM
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#2
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Senior Member
Join Date: Jul 2019
Location: Upstate SC
Posts: 2,977
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On mine it's paired up with a black line at a rubber connector just forward of your hand in the first picture and they then go forward to the cruise control servo setup on the firewall forward of the alternator.
The other end connects to a "vacuum tree" under the air intake tubes.
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01-27-2021, 02:49 PM
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#3
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Senior Member
Join Date: Aug 2008
Location: Austin, TX
Posts: 393
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Quote:
Originally Posted by GypsyR
On mine it's paired up with a black line at a rubber connector just forward of your hand in the first picture and they then go forward to the cruise control servo setup on the firewall forward of the alternator.
The other end connects to a "vacuum tree" under the air intake tubes.
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Interesting. On my 94, there are 2 red pipes with vacuum, one looking just like Rsnell's and one going to the vacuum reservoirs.
But then my chassis has the cruise control disabled, and not yet re-enabled according to the TSB.
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01-27-2021, 04:03 PM
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#4
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Senior Member
Join Date: Mar 2009
Posts: 1,720
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That tubing was left there by Ford for HVAC vacuum control. If you have a Fleetwood coach, that line is unnecessary as you have a Denso HVAC system with all electric servo motor controllers.
Richard
__________________
95 Bounder 32H F53
460
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01-27-2021, 07:36 PM
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#5
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Junior Member
Join Date: Apr 2019
Posts: 8
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Mine is a 97 holiday rambler
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01-27-2021, 07:37 PM
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#6
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Junior Member
Join Date: Apr 2019
Posts: 8
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Quote:
Originally Posted by GypsyR
On mine it's paired up with a black line at a rubber connector just forward of your hand in the first picture and they then go forward to the cruise control servo setup on the firewall forward of the alternator.
The other end connects to a "vacuum tree" under the air intake tubes.
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Thanks
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01-27-2021, 07:49 PM
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#7
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Senior Member
Join Date: May 2013
Location: S. California
Posts: 1,379
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Quote:
Originally Posted by Rsnell
Mine is a 97 holiday rambler
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If its pulling vaccum and you can't find where it goes, you need to cap it off.
__________________
2003 Monaco Knight 36ft PST Triple Slide- 315 ISC
2007 Jeep Grand Cherokee 3.0 Diesel 4x4
2- 2013 Yamaha VXR's 70MPH+. 2019 Sun Tracker 18ft Pontoon w/ 75hp Mercury
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01-28-2021, 06:47 AM
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#8
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Junior Member
Join Date: Apr 2019
Posts: 8
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Quote:
Originally Posted by Mile Marker 42
If its pulling vaccum and you can't find where it goes, you need to cap it off.
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Definitely will do that, just hoping to find where its supposed to go
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01-28-2021, 03:32 PM
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#9
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Senior Member
Gulf Streamers Club Ford Super Duty Owner
Join Date: Aug 2015
Location: Memphis, TN
Posts: 4,350
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Quote:
Originally Posted by Rsnell
I have 1 97 f53 with 7.5L engine, I found this red vacuum line that's not hooked to anything but has vacuum. Does anyone know where it connects? It's on the passenger side of engine and looks like it connects to something under the intake hose
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If that like the Ford class-C, the Red plastic goes to CHECK VALVE and (may change to Black) then to vacuum CANISTER, (on the passenger side), THEN to the DASH CONTROLS for the HVAC Heat/Cool/ Defrost selection, etc. Luck
__________________
(TerryH.) 2000-GS Conquest Limited 6266 Class-C 99-E450SD V10 
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01-28-2021, 08:47 PM
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#10
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Junior Member
Join Date: Apr 2019
Posts: 8
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Quote:
Originally Posted by THenne1713
If that like the Ford class-C, the Red plastic goes to CHECK VALVE and (may change to Black) then to vacuum CANISTER, (on the passenger side), THEN to the DASH CONTROLS for the HVAC Heat/Cool/ Defrost selection, etc. Luck
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I'll check thank you
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