What is this?
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Elder User
Joined: Jun 2003
Posts: 642
Likes: 0
From: Bay Area, CA
What is this?
I just took a little trip, and noticed something buzzing under the hood. I popped the hood and this thing is vibrating. What is it, and why would it suddenly vibrate?
Elder User
Joined: May 2005
Posts: 582
Likes: 0
From: Refugio, Texas
That Vacuum Pump Is For Two Things
Auto Lock Hubs And A/c Vent Controls.
If You Were Not Using 4x4 My Bet Would Be At The A/c Vents.
Follow The Vac Line From The Pump To Where It Enters Thru The Firewall And Into The Cab ( Behind The Dash ) And Check For A Loose Line Or Connection.
Good Luck
Auto Lock Hubs And A/c Vent Controls.
If You Were Not Using 4x4 My Bet Would Be At The A/c Vents.
Follow The Vac Line From The Pump To Where It Enters Thru The Firewall And Into The Cab ( Behind The Dash ) And Check For A Loose Line Or Connection.
Good Luck
Thread Starter
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Elder User
Joined: Jun 2003
Posts: 642
Likes: 0
From: Bay Area, CA
Originally Posted by 4X4 IN REFUGIO
That Vacuum Pump Is For Two Things
Auto Lock Hubs And A/c Vent Controls.
If You Were Not Using 4x4 My Bet Would Be At The A/c Vents.
Follow The Vac Line From The Pump To Where It Enters Thru The Firewall And Into The Cab ( Behind The Dash ) And Check For A Loose Line Or Connection.
Good Luck
Auto Lock Hubs And A/c Vent Controls.
If You Were Not Using 4x4 My Bet Would Be At The A/c Vents.
Follow The Vac Line From The Pump To Where It Enters Thru The Firewall And Into The Cab ( Behind The Dash ) And Check For A Loose Line Or Connection.
Good Luck
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Elder User
Joined: May 2005
Posts: 582
Likes: 0
From: Refugio, Texas
Ok You Are A 2x4 So Then That Leaves The A/c Vents.
Also Check The Large Black Plastic Canister That Is Next To The Pump For Cracks And Make Sure The Vac Lines Are Hooked Up To It Good.
The Vacuum That The Pump Makes Is Stored In The Canister And Then It Goes To The A/c Vent Controls.
I Think You Have A Canister Because I Do But I Have 4x4.
Anyway ..... Also Check Your Pump By Disconnecting The Vac Line From The Pump And Then Plugging It ( The Pump ) With Your Finger. When Plugging It With Your Finger, It Should Shut Off After A Few Seconds. If It Does Then You Know The Pump Should Be Ok And That You Have A Leak Somewhere.
Hope This Helps
Also Check The Large Black Plastic Canister That Is Next To The Pump For Cracks And Make Sure The Vac Lines Are Hooked Up To It Good.
The Vacuum That The Pump Makes Is Stored In The Canister And Then It Goes To The A/c Vent Controls.
I Think You Have A Canister Because I Do But I Have 4x4.
Anyway ..... Also Check Your Pump By Disconnecting The Vac Line From The Pump And Then Plugging It ( The Pump ) With Your Finger. When Plugging It With Your Finger, It Should Shut Off After A Few Seconds. If It Does Then You Know The Pump Should Be Ok And That You Have A Leak Somewhere.
Hope This Helps
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Thread Starter
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Elder User
Joined: Jun 2003
Posts: 642
Likes: 0
From: Bay Area, CA
Originally Posted by 4X4 IN REFUGIO
Ok You Are A 2x4 So Then That Leaves The A/c Vents.
Also Check The Large Black Plastic Canister That Is Next To The Pump For Cracks And Make Sure The Vac Lines Are Hooked Up To It Good.
The Vacuum That The Pump Makes Is Stored In The Canister And Then It Goes To The A/c Vent Controls.
I Think You Have A Canister Because I Do But I Have 4x4.
Anyway ..... Also Check Your Pump By Disconnecting The Vac Line From The Pump And Then Plugging It ( The Pump ) With Your Finger. When Plugging It With Your Finger, It Should Shut Off After A Few Seconds. If It Does Then You Know The Pump Should Be Ok And That You Have A Leak Somewhere.
Hope This Helps
Also Check The Large Black Plastic Canister That Is Next To The Pump For Cracks And Make Sure The Vac Lines Are Hooked Up To It Good.
The Vacuum That The Pump Makes Is Stored In The Canister And Then It Goes To The A/c Vent Controls.
I Think You Have A Canister Because I Do But I Have 4x4.
Anyway ..... Also Check Your Pump By Disconnecting The Vac Line From The Pump And Then Plugging It ( The Pump ) With Your Finger. When Plugging It With Your Finger, It Should Shut Off After A Few Seconds. If It Does Then You Know The Pump Should Be Ok And That You Have A Leak Somewhere.
Hope This Helps
Fleet Mechanic
Joined: Feb 2005
Posts: 1,797
Likes: 1
From: Northern Colorado
The small rubber vacuum hose will easily pull of of the pump so you can hold your finger on it to see if it shuts off. If you have a small leak somewhere, your vents will continue to work but the pump may continually run or run longer than what it should. If you have a small leak somewhere, that will be the challange to locate. Being a 2WD, the task should be easier since the vacuum only runs to the heater duct controls. If the pump continues to run with the line to the canister plugged, chances are your pump is shot.
Senior User
Joined: Feb 2004
Posts: 389
Likes: 0
From: NorCal
01' Excursion 7.3L 4x4 XLT
Mine does the same thing and sometimes shuts off before start up. Sometimes after startup, sometimes never buzszing at all.
I put finger over holes "T" to the right and it stops buzzing until finger is lifted.
So, I should start looking for leak?
AC/Heater seem to work fine as does the hubs.
Mine does the same thing and sometimes shuts off before start up. Sometimes after startup, sometimes never buzszing at all.
I put finger over holes "T" to the right and it stops buzzing until finger is lifted.
So, I should start looking for leak?
AC/Heater seem to work fine as does the hubs.
