New radiator fan wont turn on!!! - Mustang Evolution

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Old 08-07-2013, 03:22 PM   #1
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New radiator fan wont turn on!!!

It's an American muscle radiator fan I bought last week for $100. It will turn on only if I have the AC on. I will turn on the car to warm up and wait for it to turn on and it won't. I will see white smoke coming out around my new radiator I bought last week too. So this is when I will turn on the AC so my car won't over heat. I will put the AC full blast and the fans will come on. Could it be a sensor?
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Old 08-07-2013, 04:19 PM   #2
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Is it a replacement "same as stock" two-speed fan?
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Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 08-07-2013, 06:15 PM   #3
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Originally Posted by cliffyk View Post
Is it a replacement "same as stock" two-speed fan?
Let me check
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Old 08-07-2013, 06:25 PM   #4
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Let me check
http://www.americanmuscle.com/radiat...ly-0104gt.html

Well so far when I saw it on.... It was one speed but that's when the AC was on.
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Old 08-07-2013, 06:52 PM   #5
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It is a two-speed fan, the device highlighted in the photo below is the ballast resistor for low-speed operation.



There is an auxiliary fuse box in front of the passenger side strut tower, in it is a single 30A fuse--make sure that fuse is OK...
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 08-07-2013, 07:48 PM   #6
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Quote:
Originally Posted by cliffyk View Post
It is a two-speed fan, the device highlighted in the photo below is the ballast resistor for low-speed operation.

There is an auxiliary fuse box in front of the passenger side strut tower, in it is a single 30A fuse--make sure that fuse is OK...
Will do
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Old 08-07-2013, 07:53 PM   #7
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Will do
I meant to say, that is the fuse for low speed operation of the fan...
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 08-07-2013, 07:53 PM   #8
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Quote:
Originally Posted by cliffyk View Post

I meant to say, that is the fuse for low speed operation of the fan...
Ok. Got it
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Old 08-07-2013, 07:59 PM   #9
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Ok. Got it
If that fuse is OK there is a possibility that the low-speed relay in the CCRM is bad. There should be +12 V between either end of the fuse and ground when the PCM is commanding low-speed fan operation...
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 08-08-2013, 12:55 AM   #10
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I was googling and watching YouTube on the ECT(engine cooling temperature) switch. Well it's almost two in the morning so I won't go out now to mess with the car(neighbors) and a loud car won't be to nice at this time. So anyways I'm going to use a paper pin and jump the connector to the ECT unit and see what happens. If the fans turn on(I think it would) so then the culprit will be the ECT sensor. I can't wait until about 6 or 7 in the morning. I will update!
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Old 08-10-2013, 08:13 PM   #11
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Update!!

I replaced the Engine Coolant temperature sensor. The fans still won't come on by itself. So the car can overheat. I haven't let it get to that yet. I disconnected the wiring clip on the ECT sensor and then the fans came on. I let the car idle for almost half an hour like that and it didn't overheat because the fan is running continuously. So I've heard there's a relay in the passenger fender well. Almost everything in the cooling system was replaced except the water pump. The water pump don't need replacing. I did all the test to rule that out. I've also heard the system won't read the new ECT sensor right away. Can anyone that had a problem similar chime in or has an idea.
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Old 08-10-2013, 08:21 PM   #12
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Did you already replace the thermostat?? If so, your car shouldn't be overheating, even with the fan not turning on. The fan is primarily used as a back up when turning on your A/C system. I've had my car for years 2000 GT and the fan never came on until I turned on the A/C. ?? Never had any overheating issues because I change my thermostat every 30,000 miles.
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Old 08-10-2013, 10:07 PM   #13
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Did you already replace the thermostat?? If so, your car shouldn't be overheating, even with the fan not turning on. The fan is primarily used as a back up when turning on your A/C system. I've had my car for years 2000 GT and the fan never came on until I turned on the A/C. ?? Never had any overheating issues because I change my thermostat every 30,000 miles.
Yes I replaced that too. Tomorrow I'm going to pickup a voltmeter to check all fuses and relays. Then I will see what the next step will be. I'm hoping its something small and stupid.
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Old 08-11-2013, 08:35 AM   #14
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Originally Posted by cliffyk View Post

If that fuse is OK there is a possibility that the low-speed relay in the CCRM is bad. There should be +12 V between either end of the fuse and ground when the PCM is commanding low-speed fan operation...
So far everything is pointing towards with what you said. I'm going to pickup a volt meter soon and will check that fuse 30A in that auxiliary box you said. If that don't work I'm going to be leaning in getting a new CCRM from ford or if I can get one in a junkyard.thanks for the tip cliffyk. You know your stuff.
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