Fan on radiator does not turn on

METALHEAD1

MEMBER
2011 HYUNDAI I10
1.1L
4 CYL
MANUAL
150 MILES

Pipes from radiator builds up pressure but fan don't switch on. Only when sensor is disconnected. Changed sensor and relay but still don't work. Works when AC is switched on.

Friday, December 13th, 2019 AT 12:03 PM

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

This is a control module issue. Here in the USA we call it a PCM but it may be an ECM (engine control module) overseas. When the sensor is disconnected it is giving the module an open circuit so the default is to turn the fan on. Also, when the AC is on the default is to turn it on. If everything is hooked up and the sensor is reading accurately, as we can assume it is since it has been replaced, then more than likely the control module is the issue.

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