RADIATOR FAN STAYS ON ALL THE TIME

97CobraNow · January 31st, 2012, 11:59 PM

hi. i just got my car back from the shop. the motor was rebuilt with new cams, port and polish, headers. i noticed my radiator fan connector was unplugged when i got home. i plugged it in, and the fan came on. the car was off. what could the problem be?

glittle75 · February 1st, 2012, 08:10 AM

fan relay is on in the tune. if you hvae a handheld you can turn it off.

97CobraNow · February 1st, 2012, 06:07 PM

car is on a stock tune right now though. even when i had the tuner, it only came on at specified temperatures. any other ideas?

glittle75 · February 1st, 2012, 09:31 PM

did it go off after a bit, or did you disconnect it again?

Does the fan in your 97 stay on after you shutdown the car to help cool the car? Or always went off as soon as you kill the car?

If it is coming on with the car off, and not supposed to be, then the relay is getting power somehow, obviously, trace it back and see where the power is coming from. Fan relays are usually 5v IIRC, so i doubt its straight off the battery.

97CobraNow · February 1st, 2012, 11:22 PM

it stays on all the time if it is connected. even with the car off. it never did this. the only relay in the circuit is the CCRM. the fan is ran off a 60amp fuse in the fuse box under the hood.

glittle75 · February 2nd, 2012, 08:47 AM

look on your coolant crossover, you should have 2 temp sensors, on sends its signal to the PCM / CCRM to turn the fan on, and the other is just for the dash guage. If the on for the PCM is bad, it sends a hot signal and will kick the fan on no matter what. Try switching the plugs between the two and see if it goes off, if it does, change the bad sensor. If not probly swap the CCRM with a known good one and see what it does, or just go ahead and replace it.

97CobraNow · February 3rd, 2012, 03:44 PM

it was the low side relay in the ccrm, i cut the power to the fan after the ccrm. i then grounded up the signal wire from the pcm to the ccrm for the high speed relay through a switch. i can now turn on the high speed fan at my discretion. thank you for the help!!!!

glittle75 · February 3rd, 2012, 10:14 PM

nice, glad you got it figured out. Sorry wasnt more helpfull.

97CobraNow · February 16th, 2012, 01:51 AM

its all good man, it actually worked out in my favor. i like the set up. thank you!

January 31st, 2012, 11:59 PM	#1
97CobraNow Regular Join Date: Jun 2009 Posts: 149 iTrader: 0 reviews	RADIATOR FAN STAYS ON ALL THE TIME hi. i just got my car back from the shop. the motor was rebuilt with new cams, port and polish, headers. i noticed my radiator fan connector was unplugged when i got home. i plugged it in, and the fan came on. the car was off. what could the problem be?

February 1st, 2012, 08:10 AM	#2
glittle75 Enthusiast 2003 Mach 1 Join Date: Apr 2011 Location: NC Posts: 726 iTrader: 0 reviews	fan relay is on in the tune. if you hvae a handheld you can turn it off. __________________ 2003 Azure Blue Mach 1 - KB, Suspension, Bolt-ons. 497hp, 460tq.

February 1st, 2012, 09:31 PM	#4
glittle75 Enthusiast 2003 Mach 1 Join Date: Apr 2011 Location: NC Posts: 726 iTrader: 0 reviews	did it go off after a bit, or did you disconnect it again? Does the fan in your 97 stay on after you shutdown the car to help cool the car? Or always went off as soon as you kill the car? If it is coming on with the car off, and not supposed to be, then the relay is getting power somehow, obviously, trace it back and see where the power is coming from. Fan relays are usually 5v IIRC, so i doubt its straight off the battery. __________________ 2003 Azure Blue Mach 1 - KB, Suspension, Bolt-ons. 497hp, 460tq.

February 2nd, 2012, 08:47 AM	#6
glittle75 Enthusiast 2003 Mach 1 Join Date: Apr 2011 Location: NC Posts: 726 iTrader: 0 reviews	look on your coolant crossover, you should have 2 temp sensors, on sends its signal to the PCM / CCRM to turn the fan on, and the other is just for the dash guage. If the on for the PCM is bad, it sends a hot signal and will kick the fan on no matter what. Try switching the plugs between the two and see if it goes off, if it does, change the bad sensor. If not probly swap the CCRM with a known good one and see what it does, or just go ahead and replace it. __________________ 2003 Azure Blue Mach 1 - KB, Suspension, Bolt-ons. 497hp, 460tq.

February 3rd, 2012, 10:14 PM	#8
glittle75 Enthusiast 2003 Mach 1 Join Date: Apr 2011 Location: NC Posts: 726 iTrader: 0 reviews	nice, glad you got it figured out. Sorry wasnt more helpfull. __________________ 2003 Azure Blue Mach 1 - KB, Suspension, Bolt-ons. 497hp, 460tq.

February 1st, 2012, 06:07 PM	#3
97CobraNow Regular Join Date: Jun 2009 Posts: 149 iTrader: 0 reviews	car is on a stock tune right now though. even when i had the tuner, it only came on at specified temperatures. any other ideas?

February 1st, 2012, 11:22 PM	#5
97CobraNow Regular Join Date: Jun 2009 Posts: 149 iTrader: 0 reviews	it stays on all the time if it is connected. even with the car off. it never did this. the only relay in the circuit is the CCRM. the fan is ran off a 60amp fuse in the fuse box under the hood.

February 3rd, 2012, 03:44 PM	#7
97CobraNow Regular Join Date: Jun 2009 Posts: 149 iTrader: 0 reviews	it was the low side relay in the ccrm, i cut the power to the fan after the ccrm. i then grounded up the signal wire from the pcm to the ccrm for the high speed relay through a switch. i can now turn on the high speed fan at my discretion. thank you for the help!!!!

February 16th, 2012, 01:51 AM	#9
97CobraNow Regular Join Date: Jun 2009 Posts: 149 iTrader: 0 reviews	its all good man, it actually worked out in my favor. i like the set up. thank you!

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