AC fan is not working, need the location of the motor resistor - Taurus Car Club of America : Ford Taurus Forum
Register Home Forums Active Topics Topic Finder Photos Members List Search Today's Posts Mark Forums Read Auto EscrowAuto Loans
TaurusClub.com is the premier Ford Taurus Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools
Old 12-06-2012, 11:18 AM   #1 (permalink)
Member
 
Prismatic's Avatar
 
Member Number: 21887
Join Date: Aug 2009
Location: San Diego, CA
Drives: 1999 Taurus SE 3l V6
Visit: My Garage
Posts: 402
Trader Score: 0 reviews
Rep Power: 0
Prismatic has a little shameless behaviour in the past
Default AC fan is not working, need the location of the motor resistor

Before I go and replace the motor (as per this thread http://www.taurusclub.com/forum/1703494-post2.html ) I'd like to test the resistor out.

I have no fan activity in any setting. The AC comp turns on, and the AC fan up front works as it should.

1999 SE 3.0 OHV

Thanks!
Prismatic is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 12-06-2012, 01:10 PM   #2 (permalink)
Technical Advisor
 
Member Number: 11378
Join Date: Feb 2007
Location: Milwaukee, WI
Visit: My Garage
Posts: 4,917
Trader Score: 0 reviews
Rep Power: 62
Jeff K has a reputation beyond reputeJeff K has a reputation beyond reputeJeff K has a reputation beyond reputeJeff K has a reputation beyond repute
Default

I assume you have manual HVAC controls (not EATC) If so: If the resistor fails, the blower will still work on high speed, as high speed bypasses the resistor entirely. So, if the blower doesnt work on high, the problem it not the resistor.

Test the blower motor. You should be able to access the 2 terminal blower motor connector under the dash or behind the glove box. Run 2 long, heavy gauge wires from the battery into the passenger compartment and try to power up the motor at its connector. If it doesnt run, replace blower motor. If it does run, trace the circuit back to the blower switch, fuse box, etc looking for an open.

If you have EATC, blower speed is controlled by a solid state controller.
__________________
05 Taurus SEL Duratec - my daily driver
04 Taurus SES Duratec - wifes car
95 Taurus GL Vulcan winter car
Toy #1 - 86 Tbird 5.0 (original owner) - LOTS of mods
Toy #2 - 88 Tbird Turbo Coupe - LOTS of mods
02 Pontiac Grand Prix GT
67 Honda 450 Super Sport - completely customized
Jeff K is online now   Reply With Quote
Old 12-06-2012, 04:33 PM   #3 (permalink)
Member
 
Prismatic's Avatar
 
Member Number: 21887
Join Date: Aug 2009
Location: San Diego, CA
Drives: 1999 Taurus SE 3l V6
Visit: My Garage
Posts: 402
Trader Score: 0 reviews
Rep Power: 0
Prismatic has a little shameless behaviour in the past
Default

Quote:
Originally Posted by Jeff K View Post
I assume you have manual HVAC controls (not EATC) If so: If the resistor fails, the blower will still work on high speed, as high speed bypasses the resistor entirely. So, if the blower doesnt work on high, the problem it not the resistor.

Test the blower motor. You should be able to access the 2 terminal blower motor connector under the dash or behind the glove box. Run 2 long, heavy gauge wires from the battery into the passenger compartment and try to power up the motor at its connector. If it doesnt run, replace blower motor. If it does run, trace the circuit back to the blower switch, fuse box, etc looking for an open.

If you have EATC, blower speed is controlled by a solid state controller.
It is manual HVAC, yes. The blower just shut off as I was driving. I managed to make it pop back on, albeit with the blower making an odd whine, by switching between off and vent a few times, but then it cut out completely.

I'll test the motor first, thanks for the tip on the resistor.
Prismatic is offline   Reply With Quote
Old 12-07-2012, 07:17 AM   #4 (permalink)
Devoted Member
 
SoNic67's Avatar
 
Member Number: 35029
Join Date: Mar 2011
Chapter: Northeast
Drives: 1996 Sable LS, 3.0L V6 24V Duratec, AX4N
Visit: My Garage
Posts: 1,820
Trader Score: 0 reviews
Rep Power: 12
SoNic67 has a spectacular aura about
Default

Spray some electric contact cleaner in the fan connector (the one under dash). Mine had some corrosion on that contacts and it would not start when cold.
SoNic67 is online now   Reply With Quote
Old 12-07-2012, 07:31 AM   #5 (permalink)
Technical Advisor
 
behlinla's Avatar
 
Member Number: 14275
Join Date: Dec 2007
Location: Wisconsin
Chapter: Midwest
Drives: A blue car
Visit: My Garage
Posts: 7,503
Trader Score: 0 reviews
Rep Power: 80
behlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond repute
Default

Could be the brushes going bad. Do you get any kind of ozone (electrical) smell when it's acting up? Bypass testing the motor is a good idea like Jeff said. If you have a test light, you can also check for voltage at the fan connector.
behlinla is offline   Reply With Quote
Old 12-08-2012, 11:54 PM   #6 (permalink)
Member
 
Prismatic's Avatar
 
Member Number: 21887
Join Date: Aug 2009
Location: San Diego, CA
Drives: 1999 Taurus SE 3l V6
Visit: My Garage
Posts: 402
Trader Score: 0 reviews
Rep Power: 0
Prismatic has a little shameless behaviour in the past
Default

Hey guys. So after some testing I discovered there was no power making its way to the motor, but the motor was just fine. I ruled out the switch in the dash and finally decided to check under the hood.

The 40a fuse is fine, so I pulled the relay out to test it annnnnnd yeah, there was no testing required.



Ugh. It looked bad. I pulled the back cover off that fuse block and the harness is fine. I cleaned the contacts to bare metal again and put a new relay in. Works great. I'm a bit upset that the fuse didn't pop before that relay burned up. That pin literally jumps directly to the fuse.

Maybe corrosion? Who knows.
Prismatic is offline   Reply With Quote
Old 12-09-2012, 08:37 AM   #7 (permalink)
Technical Advisor
 
Member Number: 11378
Join Date: Feb 2007
Location: Milwaukee, WI
Visit: My Garage
Posts: 4,917
Trader Score: 0 reviews
Rep Power: 62
Jeff K has a reputation beyond reputeJeff K has a reputation beyond reputeJeff K has a reputation beyond reputeJeff K has a reputation beyond repute
Default

Glad to hear you found the problem! Corrosion = high resistance in circuit = little to no current flow = fan doesnt run. Fuses blow with excessive current draw, they dont blow with little to no current flow.
__________________
05 Taurus SEL Duratec - my daily driver
04 Taurus SES Duratec - wifes car
95 Taurus GL Vulcan winter car
Toy #1 - 86 Tbird 5.0 (original owner) - LOTS of mods
Toy #2 - 88 Tbird Turbo Coupe - LOTS of mods
02 Pontiac Grand Prix GT
67 Honda 450 Super Sport - completely customized
Jeff K is online now   Reply With Quote
Sponsored Links
Advertisement
 
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 01:23 PM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.3.2