Intermittent radiator fan - Ford Mustang Forum
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post #1 of 11 (permalink) Old 2 Weeks Ago Thread Starter
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Intermittent radiator fan

Hey guys, I've got a 2013 gt and sometimes my radiator fans don't come on causing the car to overheat. In these instances turning on the ac doesn't kick the fans on either. The high and low speed fuses and relays are all good. I've changed them all, and I also replaced the thermostat. I'm running out of things to try and am getting real frustrated. Any ideas? Thanks in advance.

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post #2 of 11 (permalink) Old 2 Weeks Ago
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Did you check the fan motor to see if it is working,kind of a known problem with these cars.
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post #3 of 11 (permalink) Old 2 Weeks Ago Thread Starter
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No, I figured that if the fan motor was toast it wouldn't work at all. As it sits it works probably 80% of the time. Makes it very difficult to diagnose.
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post #4 of 11 (permalink) Old 2 Weeks Ago
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Is the car Tuned ?

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post #5 of 11 (permalink) Old 2 Weeks Ago Thread Starter
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Yes, it's a cobra jet set up with long tubes. Tuned by vmp.
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post #6 of 11 (permalink) Old 2 Weeks Ago
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Quote:
Originally Posted by RowdyCoyote View Post
Hey guys, I've got a 2013 gt and sometimes my radiator fans don't come on causing the car to overheat. In these instances turning on the ac doesn't kick the fans on either. The high and low speed fuses and relays are all good. I've changed them all, and I also replaced the thermostat. I'm running out of things to try and am getting real frustrated. Any ideas? Thanks in advance.
Sounds like the cooling fan resistor has crapped out on you. If you Google the part number you can find it a little cheaper than TASCA


https://www.tascaparts.com/oem-parts...Y4LWdhcw%3D%3D


2014 GT Premium, Track Pack, Barton shifter, Borla S-type exhaust, Resonator delete, 3.73 gears, Airaid C.A.I., 93 Race Tune, JLT Oil Separator
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post #7 of 11 (permalink) Old 2 Weeks Ago
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This may sound dumb, but the fan should only come on when the engine temp reaches a certain temp. It is triggered by the block temperature sender. If the sender is defective, it may not show an "overheat" temp. Also, how hot is your "overheating"? Engines can run at the 240* range and still not be overheated.
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post #8 of 11 (permalink) Unread 52 Minutes Ago Thread Starter
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So I'm pretty sure the temp sensor is working. It doesn't come on when i kick the ac on either. I replaced the resistor and it great for about a week then tonight started overheating again. Any other suggestions?
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post #9 of 11 (permalink) Unread 43 Minutes Ago
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I would give VMP a call and see if they had any issues with their tune.

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post #10 of 11 (permalink) Unread 31 Minutes Ago Thread Starter
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I tried to and the pretty much told me to kick rocks unless I bought another tune.
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post #11 of 11 (permalink) Unread 29 Minutes Ago
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Quote:
Originally Posted by RowdyCoyote View Post
So I'm pretty sure the temp sensor is working. It doesn't come on when i kick the ac on either. I replaced the resistor and it great for about a week then tonight started overheating again. Any other suggestions?
Fans are switched on and off by the temp. sensor, but only indirectly. The sensor cannot switch the high currents demanded by fan motors, but it CAN switch a relay on and off, the relay having heavy contacts able to turn motors on and off.

The intermittent operation could easily be caused by burnt relay contacts; surprised no one mentioned it. If this system uses a "CCRM" (Constant Control Relay Module), as my '94 GT had, note HAD, no more, you can't access only the fan relay. The CCRMs contain several relays, fan, fuel pump, etc.

Since it's intermittent, I would throw in a manual switch, turn on and offable while driving, and see if the overheat goes away. Doing that would eliminate several possible causes: "tune", temp. sensor, fan motor, wiring harness, etc. Lot of trouble, sure. Or go ahead and replace the CCRM, or fan relay, if accessible alone.
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