1996 E150 Blue Aux Vacuum Run
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Trailering
Joined: May 2024
Posts: 15
Likes: 1
From: Iron River, WI
1996 E150 Blue Aux Vacuum Run
I just bought a 96 Eclipse conversion van. Working on some front end issues, putting on new tires, gas shocks up front, air shocks in rear, going to do the brakes, put in new front wheel bearings, all the good mechanical things it needs having 190k.
Now I had issues with the vents not blowing, used the guide for the 97 on up thread here, found the vacuum pot for the vents, noticed it was not moving when selected, pulled off the Blue vacuum run, no suction, then pulled the blue run teed off for Aux and discovered it was chewed up by mice. I pulled off that section, plugged the connector, and now the front vents work as intended. I need to know where this blue Aux line runs to so I can repair it, easier for me to just patch into it somewhere other than up under the dash, as I would have to yank out entire dash to access where this run was heading.
Anyone with rear heat and AC know where they route this vacuum run so I can find it and splice into it?
Thanks...
Now I had issues with the vents not blowing, used the guide for the 97 on up thread here, found the vacuum pot for the vents, noticed it was not moving when selected, pulled off the Blue vacuum run, no suction, then pulled the blue run teed off for Aux and discovered it was chewed up by mice. I pulled off that section, plugged the connector, and now the front vents work as intended. I need to know where this blue Aux line runs to so I can repair it, easier for me to just patch into it somewhere other than up under the dash, as I would have to yank out entire dash to access where this run was heading.
Anyone with rear heat and AC know where they route this vacuum run so I can find it and splice into it?
Thanks...
Cargo Master
Joined: Sep 2012
Posts: 2,112
Likes: 286
From: Eastern TN
In factory completed vans the blue line runs from the dash along the driver side floor to the rear air handler. The rear air handler has a simple flap that directs air through the heater core to floor registers with no vacuum signal or through the evaporator to ceiling registers with vacuum signal. No blend function.
Sixto
07 E350 5.4 198K miles
Sixto
07 E350 5.4 198K miles
Thread Starter
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Trailering
Joined: May 2024
Posts: 15
Likes: 1
From: Iron River, WI
Does the harness run from passenger side across the dash and down?
Just asking because the vacuum run was heading to the right, and I did see some harnesses on that side, not sure if just to the computer or not.
I mean it could have looped around and went back towards the left, but I guess will look for harnesses on the left ducking down into the carpet, thanks...
Just asking because the vacuum run was heading to the right, and I did see some harnesses on that side, not sure if just to the computer or not.
I mean it could have looped around and went back towards the left, but I guess will look for harnesses on the left ducking down into the carpet, thanks...
Fleet Owner
Joined: Aug 2010
Posts: 21,253
Likes: 1,656
From: Reynoldsburg, Ohio
Over 3-4 different E-Series ranging from 1997 through 2006 the blue vacuum tubing under discussion here runs from under the center of the dashboard to the driver's side and continues along the same path as the electrical wiring for the rear of the van. Just like the electrical wiring there are connectors or possible splice points located some where near or inside the driver's side B-pillar.
I've also never seen any factory installed rear heating/AC anywhere else but the driver's side rear corner.
I've also never seen any factory installed rear heating/AC anywhere else but the driver's side rear corner.
Cargo Master
Joined: Sep 2012
Posts: 2,112
Likes: 286
From: Eastern TN
Is there a blue vacuum line at the air handler? To JWA’s point, the blue line is routed with the rear blower wires for most of the run.
Where is the rear air handler on your conversion van? How are the AC snd heater lines routed to the air handler?
Sixto
07 E350 5.4 198K miles
Where is the rear air handler on your conversion van? How are the AC snd heater lines routed to the air handler?
Sixto
07 E350 5.4 198K miles
Thread Starter
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Trailering
Joined: May 2024
Posts: 15
Likes: 1
From: Iron River, WI
Everything is ran down left side to left rear where the climate system is mounted. Some 3rd party sticker making claim to performing the AC install to rear.
Do these wires run out to engine compartment then turn and run to back of van as I see a harness coming down from dash to lower left where left foot might touch and exit interior space.
But there is no blue vacuum run in that mix. I cut the black wrap and looked for it inside the cluster of wires. Why I asked where the AUX vacuum was ran as it was aiming towards the right and was chewed about where a passenger would look forward from their seat at under dash. You would have to pull off dash to access where it was cut and I am not into all that work... I thought it was going down to the left, I have not looked under the van yet, at least for this run, was waiting for parts to come to jack up again.. I did see either an emission fume canister or a vacuum reserve under a shield on the left side when worked on exhaust. Was just trying to find it inside so shorter splice... thanks...
Do these wires run out to engine compartment then turn and run to back of van as I see a harness coming down from dash to lower left where left foot might touch and exit interior space.
But there is no blue vacuum run in that mix. I cut the black wrap and looked for it inside the cluster of wires. Why I asked where the AUX vacuum was ran as it was aiming towards the right and was chewed about where a passenger would look forward from their seat at under dash. You would have to pull off dash to access where it was cut and I am not into all that work... I thought it was going down to the left, I have not looked under the van yet, at least for this run, was waiting for parts to come to jack up again.. I did see either an emission fume canister or a vacuum reserve under a shield on the left side when worked on exhaust. Was just trying to find it inside so shorter splice... thanks...
Thread Starter
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Trailering
Joined: May 2024
Posts: 15
Likes: 1
From: Iron River, WI
As in do not see anything running under carpet, just out of cab towards front left corner, was it supposed to run under carpet or under truck exiting where I noted?
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Fleet Mechanic
Joined: Jan 2023
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On my '97 15 passenger van everything is run along the left wall behind plastic paneling and along the ductwork for the heater (that only flows into the floor). Take a trip to a self serve junkyard and see how things are arranged.
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Cargo Master
Joined: Sep 2012
Posts: 2,112
Likes: 286
From: Eastern TN
It wouldn’t be under the carpet aft of the driver seat. There are junction points in the lower b-pillar area. From there conduits run aft in the pocket of the double wall.
How much of the van do you have apart? On factory vans a lot has to come out to get to the rear air handler.and that gives you only a peek at the blue line.
Sixto
07 E350 5.4 198K miles
How much of the van do you have apart? On factory vans a lot has to come out to get to the rear air handler.and that gives you only a peek at the blue line.
Sixto
07 E350 5.4 198K miles
Fleet Owner
Joined: Aug 2010
Posts: 21,253
Likes: 1,656
From: Reynoldsburg, Ohio
Just like the wiring harnesses feeding the rear of the van the blue vacuum line will run behind the driver's side kick panel, under the foot well then exit inside the lower driver's side B-Pillar. Some trim panels might require removal to fully access those areas.
HTH
HTH
4wd Low
Joined: Jul 2024
Posts: 14
Likes: 0
Weird question, but do you have the 5.8 with a e4od transmission? Could you measure your transmission dipstick for me if so? Mine is the wrong one on my van and I've been searching almost literally all day for a solution. Checked 15 salvage yards in a 200 mile radius and nobody has my same van. If you have this same setup, I would be so grateful if you could measure your transmission dipstick so I can diy my own.
Thread Starter
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Trailering
Joined: May 2024
Posts: 15
Likes: 1
From: Iron River, WI
I just gave up finding it, Think will see if can work through the opening on top and loosen against windshield and repair where mice chewed it. As it was running over towards Passenger side about 6 inches to right of the opening on dash. I was cool in hot days this summer, not sure if the back blew any air or not or if some door had to close or open requiring vacuum, never hopped in back to check it out, just used to haul some materials for remodeling project... When have any free time will get back to rear climate system. If it runs down the left like JWA stated, then odd it shoots over to passenger side, the right, think it would loop somewhere under dash and there would be enough hose to reroute or repair... thanks for reply, sorry came back so late...
4wd Low
Joined: Jul 2024
Posts: 14
Likes: 0
Awesome. Thank you so much. Could I ask one more favor? Can you measure where the cold line starts and stops/the hot marks.
I also have rear ac issues. My blend door is stuck on hot. I read somewhere there is an actuator or something, I forget the name, under the doghouse, above the transmission that runs a line all the way to the rear.
I also have rear ac issues. My blend door is stuck on hot. I read somewhere there is an actuator or something, I forget the name, under the doghouse, above the transmission that runs a line all the way to the rear.
Cargo Master
Joined: Sep 2012
Posts: 2,112
Likes: 286
From: Eastern TN
The rear box defaults to heat. Hot coolant circulates in the rear core when the engine’s running and any air from the blower is directed through the hot core to the floor vents. When you set the mode dial to the left side of off, vacuum is applied through the blue line to an actuator at the rear handler to send air from the blower through the evaporator to the ceiling vents. There’s no blend function in the rear - heat to the floor, cold to the ceiling or off.
If you’re not getting cool air at the rear, there’s no vacuum signal to the actuator, the actuator is bad and/or the flap lever the actuator pulls broke off. Broken flap lever is a common failure. You can still get replacement flaps for about $30. Seats, outboard belts and upper and lower interior panels have to come off to get to the rear air handler. I would have a flap and known good actuator on hand just to not have to tear everything apart again. I’m pretty sure the flap part number is 5C2Z-19A760-A.
Sixto
07 E350 5.4 198K miles
If you’re not getting cool air at the rear, there’s no vacuum signal to the actuator, the actuator is bad and/or the flap lever the actuator pulls broke off. Broken flap lever is a common failure. You can still get replacement flaps for about $30. Seats, outboard belts and upper and lower interior panels have to come off to get to the rear air handler. I would have a flap and known good actuator on hand just to not have to tear everything apart again. I’m pretty sure the flap part number is 5C2Z-19A760-A.
Sixto
07 E350 5.4 198K miles