Cooling fan problems are back... Help please?
Safety Car
Joined: Sep 2006
Posts: 3,922
Likes: 4
From: Cheektowaga NY
St. Jude Donor '08
Now if your saying that the fans would be on all the time but not at 100%, I would agree with you. Nothing wrong with the fans being on a minimal speed, what you never want to do is command 100% at any temp.
Racer
Joined: Apr 2002
Posts: 321
Likes: 25
From: Wilmington DE
I had the EXACT same problem. The problem turned out being the computer was fried just on the circut that controlled the fan. I did all of the things that you did- replaced the plug, replaced the module, hotwired the fan to see if it worked, tried to turn it on via the tech II, and refashed the stock program. I bought a new computer and it worked!
However a word of caution. After Frann at RPM diagnosed it as the computer, I went to the local dealership and bought a computer. The guys at the dealership said that they had to have the car to program the VIN into the new computer. I wont bore you with the details, but I eventually got someone with a GM diag system (not a tech II) to flash the VIN. If is is your computer, get the VIN flashed by the supplier who gives you the computer.
However a word of caution. After Frann at RPM diagnosed it as the computer, I went to the local dealership and bought a computer. The guys at the dealership said that they had to have the car to program the VIN into the new computer. I wont bore you with the details, but I eventually got someone with a GM diag system (not a tech II) to flash the VIN. If is is your computer, get the VIN flashed by the supplier who gives you the computer.
Safety Car
Joined: Sep 2007
Posts: 3,502
Likes: 82
That is incorrect. My fans were programmed at 40%@192 and 90% for every value after 192 degrees and it worked flawless. I could site in an open garage and actually hear the fan increase its speed after 192 degrees. Never had a problem and the fans were not 100% at 192.
Now if your saying that the fans would be on all the time but not at 100%, I would agree with you. Nothing wrong with the fans being on a minimal speed, what you never want to do is command 100% at any temp.
Now if your saying that the fans would be on all the time but not at 100%, I would agree with you. Nothing wrong with the fans being on a minimal speed, what you never want to do is command 100% at any temp.
Safety Car
Joined: Sep 2006
Posts: 3,922
Likes: 4
From: Cheektowaga NY
St. Jude Donor '08
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
Thread Starter
Le Mans Master
Joined: Oct 2007
Posts: 6,149
Likes: 11
From: Greater Detroit Metro MI, when I'm not travelling.
Update
Took it to the dealer and had the PCM flashed back to stock with a Tek-2. Nothing.
Had the fans commanded to turn on with a Tek-2. Nothing.
Took the plug on and off a bunch of times. Although the plug doesn't look damaged, the fan worked after a few tries. It looks like one of the contacts is pushed back. I can not move it at all though.
Now is where it gets strange. I went back to work and tried telling the fan to turn on via HP Tuners with VCM controls. That DOES NOT WORK. Once the car warmed up, the fans turned on.
Drove home; 20 miles later it stopped working again. That is SO ANNOYING!
I can't seem to find a plug for sale anywhere. I guess I'll just have to buy a new fan? Any ideas?
Had the fans commanded to turn on with a Tek-2. Nothing.
Took the plug on and off a bunch of times. Although the plug doesn't look damaged, the fan worked after a few tries. It looks like one of the contacts is pushed back. I can not move it at all though.
Now is where it gets strange. I went back to work and tried telling the fan to turn on via HP Tuners with VCM controls. That DOES NOT WORK. Once the car warmed up, the fans turned on.
Drove home; 20 miles later it stopped working again. That is SO ANNOYING!
I can't seem to find a plug for sale anywhere. I guess I'll just have to buy a new fan? Any ideas?
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Le Mans Master
Joined: Nov 2007
Posts: 6,419
Likes: 200
From: Wilkes-Barre Pa
Contact http://www.corvetterecycling.com/Default.asp
Tell them your problem and see if they have anything that may help.
Tell them your problem and see if they have anything that may help.
Thread Starter
Le Mans Master
Joined: Oct 2007
Posts: 6,149
Likes: 11
From: Greater Detroit Metro MI, when I'm not travelling.
- THE FAN WORKS
- THE FAN FUSE IS FINE
- THERE IS POWER AT THE FAN CONTROL MODULE
I found that I could run the fan by jumping the wires on the control module
I can pull the plug on the fan speed controller PWM module), jump the ground and power pins, and turn the fan on at full speed.
- THE FAN FUSE IS FINE
- THERE IS POWER AT THE FAN CONTROL MODULE
I found that I could run the fan by jumping the wires on the control module
I can pull the plug on the fan speed controller PWM module), jump the ground and power pins, and turn the fan on at full speed.
Thread Starter
Le Mans Master
Joined: Oct 2007
Posts: 6,149
Likes: 11
From: Greater Detroit Metro MI, when I'm not travelling.
Contact http://www.corvetterecycling.com/Default.asp
Tell them your problem and see if they have anything that may help.
Tell them your problem and see if they have anything that may help.
I'll try soldering the wires first, maybe that'll do it.
Safety Car
Joined: Sep 2007
Posts: 3,502
Likes: 82
To clarify: If I understand correctly you bypassed the connection completely in your previous effort right? What I am suggesting is that you jumper past the pin that you believe is not making connection in the plug...NOT bypass the entire assembly (hotwire it) as you previously have done!
Last edited by Motorhead-47; Apr 6, 2010 at 11:44 AM.
Thread Starter
Le Mans Master
Joined: Oct 2007
Posts: 6,149
Likes: 11
From: Greater Detroit Metro MI, when I'm not travelling.
To clarify: If I understand correctly you bypassed the connection completely in your previous effort right? What I am suggesting is that you jumper past the pin that you believe is not making connection in the plug...NOT bypass the entire assembly (hotwire it) as you previously have done!
Makes sense?
Thread Starter
Le Mans Master
Joined: Oct 2007
Posts: 6,149
Likes: 11
From: Greater Detroit Metro MI, when I'm not travelling.
Cut the plug and soldered the wires directly to the controller with heat shrink to protect the connections.
IT WORKS.
I also reprogrammed the fan tables using HP Tuner's new 2.5BAR OS, so my fan now turns on much earlier... It was 92F today and my coolant temps never went above 180F in stop and go traffic with the A/C on... Niiiice
IT WORKS.
I also reprogrammed the fan tables using HP Tuner's new 2.5BAR OS, so my fan now turns on much earlier... It was 92F today and my coolant temps never went above 180F in stop and go traffic with the A/C on... Niiiice
Drifting
Joined: Jul 2007
Posts: 1,454
Likes: 4
From: Massapequa NY
Cut the plug and soldered the wires directly to the controller with heat shrink to protect the connections.
IT WORKS.
I also reprogrammed the fan tables using HP Tuner's new 2.5BAR OS, so my fan now turns on much earlier... It was 92F today and my coolant temps never went above 180F in stop and go traffic with the A/C on... Niiiice
IT WORKS.
I also reprogrammed the fan tables using HP Tuner's new 2.5BAR OS, so my fan now turns on much earlier... It was 92F today and my coolant temps never went above 180F in stop and go traffic with the A/C on... Niiiice
Good to hear!!!
