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.
Intermittent radiator fan
RowdyCoyote
1 - 16 of 16 Posts
Joined
·
15 Posts
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.
Joined
·
2,710 Posts
Did you check the fan motor to see if it is working,kind of a known problem with these cars.
5.0 Coyote.
5.0 Coyote.
Joined
·
15 Posts
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.
Joined
·
15 Posts
Yes, it's a cobra jet set up with long tubes. Tuned by vmp.
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-part...mk9SkMxMDExNTUmcj0yJmE9Zm9yZCZvPW11c3RhbmcmeT0yMDEzJnQ9Z3QmZT01LTBsLXY4LWdhcw==
Joined
·
1,003 Posts
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.
Joined
·
15 Posts
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?
Joined
·
15 Posts
I tried to and the pretty much told me to kick rocks unless I bought another tune.
Joined
·
360 Posts
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.
Joined
·
15 Posts
The coyotes do have a dedicated fan relay, actually I believe there is one for both low and high speed operation. I've replaced both of them and the fuses for those circuits.
Joined
·
360 Posts
Dedicated is a good word! Separate relays, accessible, no CCRM crap. So you've covered the bases. I'm back to trying turning them relays on and off, or maybe just the high speed one, manually to see WTH happens.
Joined
·
1 Posts
Did you ever figure out the issue to this?
So after reading this post I had decided to wire a separate switch straight to the fan too. On one last hunch I took the underside of the fuse box where relay 25 and 28 connect to the wiring. There are long shiny 7mm, I think, bolts that hold the plastic underside to the fuses/relays. That is where I found the burnt connectors and wiring that prevented the low fan speed from working. After I repaired that all is well.
1 - 16 of 16 Posts
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
