Solution to cooling fan resister failure??? - Ford Focus Forum, Ford Focus ST Forum
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Ford Focus Forum, Ford Focus ST Forum > Ford Focus Tech Discussions > General Technical Chat

General Technical Chat This section is for technical discussions relating to general maintenance, electrical issues, engine trouble, and recalls.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 04-10-2012, 08:47 AM   #1
winterbeater
Focus Enthusiast
 
Join Date: Dec 2011
Fan#: 93035
Location: Royal Oak, MI
What I Drive: 2001 blue wagon

Posts: 112
FF Reputation: 3 winterbeater Good Standing Member
Buy-Sell-Trade Rating: (0)
Solution to cooling fan resister failure???

Getting warmer here in Michigan. The old Focus I bought over the winter is starting to overheat. All good when moving (runs at 94C), but idling at a stop, it gets up to about 114C before the fan kicks on. I've read a lot of threads here (thanks for the help all) and I'm confident that the problem is the famed resister. Some of the threads have been asking for cheap work-arounds, etc., as the resister costs about $50.

Why not just solder a jumper wire into the burned out resister to bypass the burned out element? Or even cutting off the plug (drastic) and connecting the two wires together. A lot of vehicles don't have two speed cooling fans. Either on or off. The fan will be noisier on high and kick on and off more often, but to me that is not a problem.

Has anyone tried this?


winterbeater is offline  
    Reply With Quote
Sponsored Links
Advertisement
 
Old 04-10-2012, 09:55 AM   #2
Magus2727
Focus Fanatic
 
Magus2727's Avatar
 
Join Date: Feb 2009
Fan#: 62897
Location: Salt Lake City, UT
What I Drive: 2001 Malibu Blue ZX3

Posts: 4,119
Points 7,787, Level 59
Points: 7,787, Level: 59 Points: 7,787, Level: 59 Points: 7,787, Level: 59
Level Up 19% Completed
Level up: 19% Level up: 19% Level up: 19%
Forum Activity 23%
Activity: 23% Activity: 23% Activity: 23%
FF Reputation: 9 Magus2727 Good Standing Member
Buy-Sell-Trade Rating: (2)
Not sure if any one has tried it, but thoughts...

With them on High all the time you may have higher current spikes and possibly blowing fuses if your always jumping from static off to full speed...

The life of the fans may drop or fail sooner as they are working at a higher duty cycle for a longer period of time

longer warm up time = longer time of the motor running on a non "optimal" fuel chart

what vehicles are you referring to when "lot of vehicles don't have two speed cooling fans."? Those that don't that I know of have a mechanical clutch fan which is the "low speed" fan....
__________________
2001 ZX3 2.0L Zetec-
Hatch Nation #42

Going through Rebuild See "The TICK Build Thread" for details (http://www.focusfanatics.com/forum/showthread.php?t=289168&referrerid=62897)
Magus2727 is offline  
    Reply With Quote
Old 04-10-2012, 12:13 PM   #3
a_2000_se
Focus Addict
 
a_2000_se's Avatar
 
Join Date: Feb 2009
Fan#: 62964
Location: The concrete jungle, CO
What I Drive: 2000 SE SOHC SPI, Compression @ 164

Posts: 1,074
Points 4,524, Level 42
Points: 4,524, Level: 42 Points: 4,524, Level: 42 Points: 4,524, Level: 42
Level Up 87% Completed
Level up: 87% Level up: 87% Level up: 87%
Forum Activity 1%
Activity: 1% Activity: 1% Activity: 1%
FF Reputation: 15 a_2000_se Great Standing Member
Buy-Sell-Trade Rating: (0)
The engine would still maintain operating temperature in the lower range but.....

The fuse may be your number one problem (30A), followed by melting your wire harness 'somewhere' if you try replacing a 30A fuse with a 50A fuse.

Wouldn't recommend it.

Would recommend fixing the original problem correctly.

__________________
Member of the Dropped Valve Seat Club.
Replaced #4 Piston, Rings, Rod+Bearings, AERA Re-Manufactured Cylinder Head and a light Hone. Then CLEANED the hell out of everything.
60k+ miles.
a_2000_se is offline  
    Reply With Quote
Old 04-10-2012, 03:06 PM   #4
amc49
Focus Fanatic
 
Join Date: Mar 2012
Fan#: 96610
Location: Fort Worth, TX
What I Drive: 00 wagon, 02 sedan both zetec atx

Posts: 5,056
Points 2,935, Level 33
Points: 2,935, Level: 33 Points: 2,935, Level: 33 Points: 2,935, Level: 33
Level Up 24% Completed
Level up: 24% Level up: 24% Level up: 24%
Forum Activity 43%
Activity: 43% Activity: 43% Activity: 43%
FF Reputation: 23 amc49 Great Standing Member
Buy-Sell-Trade Rating: (0)
Look at the supplied schematic, the system is already able to take the power, just more noise and fan wears out faster. Possible idle quality issues with bigger current spike from standing start off.

Simply wire direct to miss the resistor will do it.
amc49 is offline  
    Reply With Quote
Old 04-10-2012, 03:10 PM   #5
Magus2727
Focus Fanatic
 
Magus2727's Avatar
 
Join Date: Feb 2009
Fan#: 62897
Location: Salt Lake City, UT
What I Drive: 2001 Malibu Blue ZX3

Posts: 4,119
Points 7,787, Level 59
Points: 7,787, Level: 59 Points: 7,787, Level: 59 Points: 7,787, Level: 59
Level Up 19% Completed
Level up: 19% Level up: 19% Level up: 19%
Forum Activity 23%
Activity: 23% Activity: 23% Activity: 23%
FF Reputation: 9 Magus2727 Good Standing Member
Buy-Sell-Trade Rating: (2)
^^^ that assumes that the wire gauge through the low speed relay is the same gauge as that through the high speed relay. what I would do instead is wire it in a "OR" configuration so the low speed relay is actually just turning on the high speed fan relay. that would be the correct way to bypass the low speed.
__________________
2001 ZX3 2.0L Zetec-
Hatch Nation #42

Going through Rebuild See "The TICK Build Thread" for details (http://www.focusfanatics.com/forum/showthread.php?t=289168&referrerid=62897)
Magus2727 is offline  
    Reply With Quote
Old 04-10-2012, 05:37 PM   #6
emsvitil
Focus Addict
 
Join Date: Sep 2007
Fan#: 50210
Location: SoCal, CA
What I Drive: 2000 SE Wagon

Posts: 1,231
Points 2,889, Level 32
Points: 2,889, Level: 32 Points: 2,889, Level: 32 Points: 2,889, Level: 32
Level Up 93% Completed
Level up: 93% Level up: 93% Level up: 93%
Forum Activity 2%
Activity: 2% Activity: 2% Activity: 2%
FF Reputation: 9 emsvitil Good Standing Member
Buy-Sell-Trade Rating: (0)
If you're worried about using a 50amp fuse, replace the 30 amp fuse with a 30 amp circuit breaker..........
__________________
Ed
emsvitil is online now  
    Reply With Quote
Old 04-10-2012, 05:39 PM   #7
emsvitil
Focus Addict
 
Join Date: Sep 2007
Fan#: 50210
Location: SoCal, CA
What I Drive: 2000 SE Wagon

Posts: 1,231
Points 2,889, Level 32
Points: 2,889, Level: 32 Points: 2,889, Level: 32 Points: 2,889, Level: 32
Level Up 93% Completed
Level up: 93% Level up: 93% Level up: 93%
Forum Activity 2%
Activity: 2% Activity: 2% Activity: 2%
FF Reputation: 9 emsvitil Good Standing Member
Buy-Sell-Trade Rating: (0)
Also, the resistor is usually fine; it's the spade connectors that get burnt up from the POS connector. Just dremel them clean.
__________________
Ed
emsvitil is online now  
    Reply With Quote
Old 04-10-2012, 08:00 PM   #8
winterbeater
Focus Enthusiast
 
Join Date: Dec 2011
Fan#: 93035
Location: Royal Oak, MI
What I Drive: 2001 blue wagon

Posts: 112
FF Reputation: 3 winterbeater Good Standing Member
Buy-Sell-Trade Rating: (0)
Thanks for all the feedback. I researched a little more and agree that most of the OEM fans are two speed.

Wire gage in the current low speed circuit would be important. I didn't realize that low speed had it's own fuse. I'll check that out and verify juice to the plug. I was thinking that when I pulled the resister out, it would be fried. Time for the VOM. And clean connectors.

Seems like wearing out the motor would be the biggest negative.
winterbeater is offline  
    Reply With Quote
Old 04-10-2012, 08:06 PM   #9
a_2000_se
Focus Addict
 
a_2000_se's Avatar
 
Join Date: Feb 2009
Fan#: 62964
Location: The concrete jungle, CO
What I Drive: 2000 SE SOHC SPI, Compression @ 164

Posts: 1,074
Points 4,524, Level 42
Points: 4,524, Level: 42 Points: 4,524, Level: 42 Points: 4,524, Level: 42
Level Up 87% Completed
Level up: 87% Level up: 87% Level up: 87%
Forum Activity 1%
Activity: 1% Activity: 1% Activity: 1%
FF Reputation: 15 a_2000_se Great Standing Member
Buy-Sell-Trade Rating: (0)
I think we're missing something here.

The Fan Resistor is a current limiting resistor/ dropping resistor. That may be why the 'low speed' circuit only needs a 30A fuse.

The high speed circuit has no series resistor, the Fan Resistor, and needs a 50A fuse.

If you short out/bypass the Fan Resistor you may exceed the 30A fuse value.
If you replace the 30A fuse with a 50A fuse you may exceed the wires current rating associated with it if it is not the correct gauge wire.
__________________
Member of the Dropped Valve Seat Club.
Replaced #4 Piston, Rings, Rod+Bearings, AERA Re-Manufactured Cylinder Head and a light Hone. Then CLEANED the hell out of everything.
60k+ miles.
a_2000_se is offline  
    Reply With Quote
Old 04-11-2012, 03:51 AM   #10
Paladin
VEKTOR PLATE
 
Paladin's Avatar
 
Join Date: Apr 2009
Fan#: 64465
Location: menasha, WI
What I Drive: blue sub #6

Posts: 5,478
Points 5,696, Level 48
Points: 5,696, Level: 48 Points: 5,696, Level: 48 Points: 5,696, Level: 48
Level Up 73% Completed
Level up: 73% Level up: 73% Level up: 73%
Forum Activity 2%
Activity: 2% Activity: 2% Activity: 2%
FF Reputation: 10 Paladin Great Standing Member
Buy-Sell-Trade Rating: (5)
ive found tht msot of the resistors fail on my car after a couple years of being blasted with rain and whatever else makes it through the radiator. i jsut make sure i have one NIB at home waiting for the next one to fail. 50 bucks every couple of years isnt so bad. (its more like a preventative maintanence thing. i jsut do it by habit now. )
__________________
MR. freaking negative
i'm not an enthusiast...... the internets told me.
Paladin is offline  
    Reply With Quote
Reply

Bookmarks & Social Networks

Thread Tools
Display Modes

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

Forum Jump


All times are GMT -5. The time now is 05:34 PM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Terms of Use : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.