Blower stopped working
Thread Starter
|
New User
Joined: Apr 2011
Posts: 11
Likes: 0
Blower stopped working
2003 F150 4wd with auto climate control. My blower for heat and AC completely stopped working a few weeks ago. I have checked all fuses, i replaced the relay under the dash, i replaced the blower motor control module. I supplied power to the blower motor itself and it ran fine with no noises. I ran the self test on the controller in the dash under the radio and it passed. I am not sure what else to try. Any suggestions? Thanks
Hotshot
Joined: Jan 2004
Posts: 19,767
Likes: 1,082
From: St Louis
That doesn't answer the question I asked. There should be power to two pins of the relay, one for the high side of the coil, the other for the load on either the C or the NO terminal.
Does the relay energize? (IE, does it audibly 'click' when the blower is supposed to operate
Does the relay energize? (IE, does it audibly 'click' when the blower is supposed to operate
Elder User
Joined: Mar 2005
Posts: 521
Likes: 1
From: Southern New England
What he said
Trending Topics
Hotshot
Joined: Jan 2004
Posts: 19,767
Likes: 1,082
From: St Louis
You need both proper power and proper grounds, in the right places and at the correct times.
If the blower relay doesn't activate when the blower should be operating, then either it's missing its power or its ground. You'll need to verify power (HOT in RUN) to pin 86 of the and that the EATC supplies a ground to pin 85 of the relay when the blower motor is switched on. When the relay energizes, it then supplies power to the BSC module to operate the blower motor.
If the blower relay doesn't activate when the blower should be operating, then either it's missing its power or its ground. You'll need to verify power (HOT in RUN) to pin 86 of the and that the EATC supplies a ground to pin 85 of the relay when the blower motor is switched on. When the relay energizes, it then supplies power to the BSC module to operate the blower motor.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Thread
Thread Starter
Forum
Replies
Last Post
wunderin
1997 - 2006 Expedition & Navigator
2
May 8, 2009 09:27 PM
flying-pig
1968-Present E-Series Van/Cutaway/Chassis
4
Apr 20, 2007 05:39 PM
ptrill
1973 - 1979 F-100 & Larger F-Series Trucks
4
Nov 30, 2006 03:12 PM