A/C & heater vacuum line problems

Reply Subscribe

Thread Tools

Search this Thread

Jan 10, 2010 | 02:51 PM

jennkent5454

Thread Starter

Senior User

Joined: Nov 2009

Posts: 147

Likes: 1

A/C & heater vacuum line problems

2003 f150 5.4l Fx4---
I am wondering if the black vacuum line that runs from near the battery through the fire wall, across the top of the A/C, is the one that controls the direction of the air flow from floor, defrost, or panel?

Mine blowing in defrost only so I'm guessing it's a vaccum line?

Jan 20, 2010 | 09:01 PM

jennkent5454

Thread Starter

Senior User

Joined: Nov 2009

Posts: 147

Likes: 1

EDIT: SEE POST BELOW THIS ONE

This is the Vacuum Connector End View—Electronic Automatic Temperature Control

1. NOT USED
2. RED-PANEL/DEFROST DOOR
3. BLUE-PANEL/FLOOR DOOR
4. BLACK-SOURCE VACUUM
5. WHITE-AIR INLET DOOR
6. YELLOW-PANEL/FLOOR DOOR

Jan 20, 2010 | 10:01 PM

jennkent5454

Thread Starter

Senior User

Joined: Nov 2009

Posts: 147

Likes: 1

THIS MAY ALSO HELP

Jan 25, 2010 | 08:00 PM

jennkent5454

Thread Starter

Senior User

Joined: Nov 2009

Posts: 147

Likes: 1

IT IS FINALLY FIXED!!!!!!

I changed the 4 o rings inside the EATC or head unit. $2 for parts.

I followed these instructions!!!!

Repaired my EATC module today. - MercuryMarauder.net Forums

thanks JACook

Jan 25, 2010 | 09:47 PM

steve(ill)

Hotshot

Joined: Jul 2005

Posts: 11,931

Likes: 180

thanks for the update. always heard that was an expensive repair. sounds like its pretty cheap if you take the time to dig in. wonder if the manual system has o-rings between the ports ???