Cooling Fan Stopped Working
Racer
Joined: Nov 2009
Posts: 480
Likes: 5
From: san antonio Republic of Texas
Le Mans Master
Joined: May 2005
Posts: 7,912
Likes: 2,057
From: Cypress TX
Got it lifted and pulled the connector apart. Sure enough, melted plastic. I pulled the center grounds out of the connectors and just reconnected it with the other two wires intact. I will solder the ground together and either shrink tube it or just use some black electrical tape.
You guys must have skinny arms. It's not going to be easy to get in there with a soldering iron.
You guys must have skinny arms. It's not going to be easy to get in there with a soldering iron.
Instructor
Joined: Apr 2009
Posts: 205
Likes: 19
From: Denver Colorado
St. Jude Donor '09
question:
my center ground melted out about a 2 months ago...and today my positive power side melted out leaving me stranded...so I now have all the wires bypassed i.e. no harness present anymore.
Is this a problem? I dont see how it would be, but wanted to ask to see if anyone knows anything
thanks
ryan
my center ground melted out about a 2 months ago...and today my positive power side melted out leaving me stranded...so I now have all the wires bypassed i.e. no harness present anymore.
Is this a problem? I dont see how it would be, but wanted to ask to see if anyone knows anything
thanks
ryan
Thread Starter
Le Mans Master
Joined: Aug 2002
Posts: 8,472
Likes: 38
From: Houston TX
St. Jude Donor '11
TTT as my fans stopped working again last night. 
My ground wire bypass looks intact. My suspicion is that the power wire, which is still in the connector, is now melted. I'll update when I get under there and take a look, probably tomorrow. I have a Mexico trip I need to make this weekend so hopefully it's something simple again.
My ground wire bypass looks intact. My suspicion is that the power wire, which is still in the connector, is now melted. I'll update when I get under there and take a look, probably tomorrow. I have a Mexico trip I need to make this weekend so hopefully it's something simple again.
Tech Contributor
Joined: Jul 2002
Posts: 14,949
Likes: 263
From: St. Louis, MO
St. Jude Donor '08
Bill what are your fan settings? I found that if I went greater than 25% in the 192 cell the fan ran at 100% all the time. I have 25% 192 and 78% 196 and the car runs 192 in stop and go.
If they are running all the time it'll get hot.
Oh by the way...I used to have a Casper's Electronics manual fan controller...until it failed on me in rush hour while raining. I removed it and since it was a year old just threw it in the toolbox. Well, turns out a friend had the same problem, and he called them, and they have a new model that goes inside the car. I called them, and even though it's been a couple of years, they told me to send mine in and they would send me a new one. Now that's good service!
If they are running all the time it'll get hot.
Oh by the way...I used to have a Casper's Electronics manual fan controller...until it failed on me in rush hour while raining. I removed it and since it was a year old just threw it in the toolbox. Well, turns out a friend had the same problem, and he called them, and they have a new model that goes inside the car. I called them, and even though it's been a couple of years, they told me to send mine in and they would send me a new one. Now that's good service!
Thread Starter
Le Mans Master
Joined: Aug 2002
Posts: 8,472
Likes: 38
From: Houston TX
St. Jude Donor '11
Joe I have the 2.5 bar SD OS so my fan tables is extended down to 163 degrees. Having said that I command 80% at 180, 90% at 190 and 100% from there on. The car needs the fan running pretty much all the time. I should probably bypass the PWM somehow.
Thread Starter
Le Mans Master
Joined: Aug 2002
Posts: 8,472
Likes: 38
From: Houston TX
St. Jude Donor '11
Now the controller fried and the positive cable that was still inside the harness was not making good contact anymore. Continuing with a new thread.
http://forums.corvetteforum.com/c6-t...post1577467132
http://forums.corvetteforum.com/c6-t...post1577467132
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Advanced
Joined: Jan 2007
Posts: 94
Likes: 0
This is exactly what happened to me. The connector melted on the harness next to the radiator, not the pig tail going into the fan itself. The problem was that GM cannot get this part any longer. I was forced to wire the fan directly to a relay/fuse. Does ANYBODY know where to get this connector from? I just need the connector and I can splice it on.
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Joined: Oct 2004
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Drifting
Joined: Apr 2007
Posts: 1,619
Likes: 4
From: Houston TX
Ok awesome. Now the symptoms of a bad PWM Fan Controller module are not speeding up the fans when engine hot???
I do have the fans running at low speed all the time. Its just that I dont hear them power up to max when driving slow in a parking garage. Also could a bad ground also cause or is it usually a PWM module.
What I am asking is, will a bad PWM module result in COMPLETE power loss to a fan or just no the abaility to crank up amps...
I do have the fans running at low speed all the time. Its just that I dont hear them power up to max when driving slow in a parking garage. Also could a bad ground also cause or is it usually a PWM module.
What I am asking is, will a bad PWM module result in COMPLETE power loss to a fan or just no the abaility to crank up amps...
Premium Supporting Vendor
Joined: Oct 2004
Posts: 23,597
Likes: 1,221
From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
Ok awesome. Now the symptoms of a bad PWM Fan Controller module are not speeding up the fans when engine hot???
I do have the fans running at low speed all the time. Its just that I dont hear them power up to max when driving slow in a parking garage. Also could a bad ground also cause or is it usually a PWM module.
What I am asking is, will a bad PWM module result in COMPLETE power loss to a fan or just no the abaility to crank up amps...
I do have the fans running at low speed all the time. Its just that I dont hear them power up to max when driving slow in a parking garage. Also could a bad ground also cause or is it usually a PWM module.
What I am asking is, will a bad PWM module result in COMPLETE power loss to a fan or just no the abaility to crank up amps...
Drifting
Joined: Apr 2007
Posts: 1,619
Likes: 4
From: Houston TX
You guys were right. I disconnected the fan plug and immediately smelled burnt plastic. The plastic around the center pin of the connector was toast. I took the center pin out of both sides and connected it outside of the harness for now. See the carnage below.
Without you guys I would have bought a whole new fan assembly before finding this out. Thanks very much!
Without you guys I would have bought a whole new fan assembly before finding this out. Thanks very much!
Intermediate
Joined: Jun 2011
Posts: 44
Likes: 6
newest member of club
Had intermittent overheat with my mobile Chernobyl unit. The fact that I had added a blower and twin fan radiator to the car made the plug nearly impossible to reach. I will have to do quite a bit of disassembly to repair.
Center pole fried. Tried to upload image but no luck.
Center pole fried. Tried to upload image but no luck.
Pro
Joined: Aug 2010
Posts: 629
Likes: 24
From: Manassas VA
it sounds like I found my problem. Drove my car 50+ miles with a small amount of traffic with my girlfriend to lunch. Coming home sitting in traffic it hit 250 degrees and the fan won't kick on. I was about to buy a new fan!! thank you CF!!!
Intermediate
Joined: May 2008
Posts: 37
Likes: 0
From: Houston TX
Cooling Fan not work due to Melted Wiring Connection
Same problem I had and same solution. After I tested that the fan was ok by jumping a hot wire to it from a different power source and it worked fine, I then unplugged the connector on the wiring harness near the radiator and the center contact had melted causing intermittent short. I'd check that first.
Le Mans Master
Joined: Jun 2009
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https://www.corvetteforum.com/forums...as-struck.html
Instructor
Joined: Dec 2013
Posts: 142
Likes: 14
