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Engine is overheating because the cooling fan is not working

Tiny
UHSNOEBIRD
  • MEMBER
  • 2014 CHEVROLET MALIBU
  • 2.0L
  • 4 CYL
  • AUTOMATIC
  • 75,000 MILES
I know for a fact that the fuse, relays and the fan motor are good. When I turn on the air conditioner the drivers side fan comes on but the passenger side fan doesn't come on at any time.
When I hot wired the passengers side fan and it will work.
It must be some kind of sensor or similar part that's stopping the fan motor from working.
I need a wiring diagram of the electrical circuit of the fan motors for the passenger side and drivers side circuits.

Car is LTZ model
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Wednesday, July 17th, 2019 AT 5:58 AM

30 Replies

Tiny
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  • MECHANIC
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Good afternoon,

I attached a wire diagram. Check the fuses listed for power with a test light or voltmeter. Make sure there is power. Check the 2 fuses I circled for power.

Roy
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Wednesday, July 17th, 2019 AT 2:51 PM
Tiny
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It has power at these fuses, what else could it be?
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Wednesday, July 31st, 2019 AT 5:47 AM
Tiny
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Okay, go to the relays. Remove the relays and turn on the key. Test for power at the pins in the fuse box where the relay plugs in. Let me know the voltages and what pins.

Roy
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Wednesday, July 31st, 2019 AT 1:03 PM
Tiny
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The computer is not sending the ground back to the relay that energizes the fan is what someone has said, we are not sure what all is in the circuit to make the fans work.
Are there any sensors in the radiator or on the head that plays a part in the fans working the correct way, that you know of?
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Wednesday, July 31st, 2019 AT 2:39 PM
Tiny
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The only sensor is the coolant sensor.

You should also verify voltages to the relays as I suggested.

Remove the connector while the engine is running and see if the fans come on.

Roy
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Wednesday, July 31st, 2019 AT 3:02 PM
Tiny
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Roy give me a little time I'm trying to get this information for a friend so it might be a day or 2 before I respond back, so be patient. Thanks for your help.
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Wednesday, July 31st, 2019 AT 7:11 PM
Tiny
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Should the fans come on once this connector is removed?
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Wednesday, July 31st, 2019 AT 7:43 PM
Tiny
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Yes, they should.

I will be here when you return.

Roy
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Thursday, August 1st, 2019 AT 1:42 AM
Tiny
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We disconnected coolant sensor and started the engine and the drivers side fan worked but passenger fan didn't work. When the engine was turned off the fan kept running, had to remove the fuse to stop the fan. Let me know what you think.
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Thursday, August 1st, 2019 AT 8:35 PM
Tiny
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Roy when we disconnected the coolant sensor it made the check engine light to come on but we never checked ( diagnostic tester ) to see if it was the engine coolant sensor code but I'm sure it was.
We disconnected the battery to erase the code.
Do we need to check the relays like you mentioned before for voltage at each pin or connection?
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Friday, August 2nd, 2019 AT 3:39 PM
Tiny
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Okay.
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Friday, August 2nd, 2019 AT 4:26 PM
Tiny
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What do you want us to check? The relay voltage or does it show you the relays are good since the fan came on when we disconnected the coolant sensor. Tell me what needs to be done now if you don't mind. Thank you
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Friday, August 2nd, 2019 AT 6:59 PM
Tiny
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Replace the coolant sensor. Start there.

If the fan came on then the circuit is good. That leaves the sensor.

Roy
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Friday, August 2nd, 2019 AT 9:43 PM
Tiny
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Roy, there was no check engine light on prior to disconnecting the coolant plug in but when it was disconnected the check engine light came on.
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Saturday, August 3rd, 2019 AT 5:12 AM
Tiny
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Roy, let me add another thing to this. The cooling and heating gauge is working but I'm not sure if that matters.
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Saturday, August 3rd, 2019 AT 6:15 AM
Tiny
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The light came on from disconnecting the sensor.

The gauges can be working normally.

Roy
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Saturday, August 3rd, 2019 AT 6:41 AM
Tiny
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I'll have him to replace the coolant sensor, is that what you recommend? Thanks
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Saturday, August 3rd, 2019 AT 2:26 PM
Tiny
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That is where I would start, yes.

Roy
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Saturday, August 3rd, 2019 AT 2:31 PM
Tiny
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Will let you know the outcome. Okay, thanks.
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Saturday, August 3rd, 2019 AT 3:08 PM
Tiny
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You are welcome.

Always glad to help.

Roy
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Saturday, August 3rd, 2019 AT 3:11 PM

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