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: 19,760
Likes: 1,079
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: 19,760
Likes: 1,079
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
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
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