Line identification and hookup

timfost85 · Jul 29, 2016

Hi all,

The first photo shows where the line in question comes out of the passenger firewall and the second shows the end of the line. I found it dangling and have no idea what it is where it connects.

It's a 2002 Ford Explorer.

Thanks for your help!

RonD · Jul 29, 2016

Black and gray are both vacuum lines

Black one goes to the vacuum reservoir, vacuum "ball", usually located passenger side front of engine bay down low, hard to see on some vehicles.

This line is the Source for vacuum in the cab vent system, vents will be stuck in Defrost if it is unhooked.

Google: 2002 explorer vacuum reservoir

To give you an idea what to look for and where to look.
Pictures in post #81 shows example of that connection and location but not 2002 model year: http://www.explorerforum.com/forums/index.php?threads/black-globe-vacuum-reservoir-on-v-6.169945/page-4

Gray vacuum line goes to heater hose valve, it also gets its vacuum from black line inside cab's climate control panel

timfost85 · Jul 29, 2016

RonD said:
This line is the Source for vacuum in the cab vent system, vents will be stuck in Defrost if it is unhooked.

Well that explains why I don't have air from the vents!

There is also a black hose taped to the same line closer to the firewall. It appears that the line was cut. Is this a vent or is it missing something?

Thanks!

RonD · Jul 29, 2016

That second black line may need to be connected to the intake manifold, so both may go to the reservoir.

You will need to find/access the vacuum reservoir, it will have 2 vacuum lines
One goes to the intake manifold, the vacuum source for the reservoir
The other is the line that goes thru the firewall to climate control

The vacuum reservoir does have an IN and OUT so lines must be connected correctly
IN is for the intake manifold line, there is a check valve on that port like the one on the power brake booster, so reservoir holds vacuum even after engine is shut off or accelerating(very low vacuum in intake)

A Common complaint is that vents in the cab change to Defrost when accelerating, that usually means vacuum reservoir is leaking or check valve is, so when accelerating there is no "reserve" so vacuum level drops in the cab and vents go to default position, which is Defrost windshield vents

timfost85 · Jul 29, 2016

Thanks for the info!

I'm having an awful time finding the reservoir... I've searched Google, but can't find anything that has helped me find it. I'm under the impression that's it's near the air box, but can't nail it down.

RonD · Jul 29, 2016

Did you look at the pictures in that link I posted?

Under the frame rail close to front bumper, so you often can't see it from inside the engine bay.

Click here: http://www.explorerforum.com/forums/index.php?threads/black-globe-vacuum-reservoir-on-v-6.169945/page-4

Scroll down to post #81

If vehicle was ever in a front end collision on that side then these are often damaged and not always replace if buyer was doing a quick repair and flip

timfost85 · Jul 29, 2016

RonD said:
Did you look at the pictures in that link I posted?

Perhaps I'm going crazy, but I've looked all over this area and can't find anything. I'm certain that the accident scenario doesn't apply because the vents worked until a couple months ago.

RonD · Jul 29, 2016

Found a thread for 2008 explorer that said it was in the cab under the glove box????

Never heard of them being in the cab but no reason it couldn't be, it was more of a capsule shape than ball shape.
If that's the case then that black line in the engine bay just need to be hooked to intake vacuum, probably came of a "T" on another vacuum line.

Found one for 2002 Explorer: http://www.explorerforum.com/forums/index.php?threads/hisssssssy-fit-from-climate-control.257677/

timfost85 · Jul 30, 2016

Yes, the reservoir is under the glove compartment, near where the passenger's feet go. Thanks!

Does this look like the correct place to plug in the line (see photo center)?

RonD · Jul 30, 2016

Can't say, didn't even know reservoir was under the glove box, lol.

Should be a vacuum hose diagram on top side of rad support.

Vacuum reservoir needs a Vacuum Source, and that is on the intake manifold, so...........

Intake manifold----------------Reservoir------------Climate control panel(in dash)

Could be reservoir was unhooked for a reason, could have a leak in the reservoir or cab hoses, so it made a sucking noise when hooked up............and in the cab that would be annoying

Line identification and hookup

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