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Overheating problem on 2012 tC. Only one fan runs..

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Overheating problem on 2012 tC. Only one fan runs..

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Old 07-09-2018, 06:10 PM
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Exclamation Overheating problem on 2012 tC. Only one fan runs..

I recently bought a 2012 Scion tC. The other day the red coolant light was blinking. I noticed the ac having a problem with cold air. I was stuck in traffic in 100+ weather.
I turned the A/C off and drove home with no more over heating light. I got Home popped the hood and checked. I saw only one radiator fan running. Turn the air back on, checked the fans again and only the one fan was still running.

This is is what I have done:
Iíve replaced the relay for the fans so I know they are good. I've ran direct power from the battery to the fan that wasnít coming on. It turns on perfectly.
I've switched the plugs for the 2 fans and drove it to see what would happen. Only one fan came on still. Itís the other fan though because I switched the plugs for them

The only other thing I can think of is the coolant temperature sensor. I ordered one and it will be here Wednesday. I donít see how that would only turn one fan on but I could be wrong.
If anyone has any other opinions please let me know. Also i tried looking for this in the threads but could not find anything. if this problem has been solved please give me the link.

Thank you.

Last edited by MR_LUV; 07-10-2018 at 04:52 AM.
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Old 07-10-2018, 02:03 AM
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Update

i did some more test on it today. I used a multi volt meter to determine if the relays are all good and they are.
i test to see if there is continuity from relays to connection ports, there is, and is also receiving 12 volts
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Old 07-13-2018, 01:01 AM
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Another update

i replaced the coolant temperature sensor and still hasn’t solved the problem. Only one fan is still coming on
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Old 07-15-2018, 06:10 PM
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I had the same problem on a similar car. I replaced the entire fan assembly which I got at my local parts store and it solved the problem!
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Old 07-16-2018, 03:34 PM
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I've had similar issues from previous cars and the fan controller is what had gone bad. I don't know that the tC has one though, not one I've seen anyway. Which fan isn't running, the radiator fan or the condenser fan?
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