JBD15 Posted February 9, 2014 Share Posted February 9, 2014 hey guys. 96 ch613 e-7 427 engine fan turns on and off randomly. changed temp sensor switch and air/electric solenoid. neither has made a difference. fan cycles normally when it supposed to at high temp. what do I look at next ? Ground? Thanks. Quote Link to comment https://www.bigmacktrucks.com/topic/34616-engine-fan-running-erratic/ Share on other sites More sharing options...
maint1 Posted February 9, 2014 Share Posted February 9, 2014 Does it have A/C ? High pressure switch will engage fan. Some if defroster is on A/C is on 1 Quote Link to comment https://www.bigmacktrucks.com/topic/34616-engine-fan-running-erratic/#findComment-231520 Share on other sites More sharing options...
JBD15 Posted February 10, 2014 Author Share Posted February 10, 2014 Yes it has a/c. it doesn't work and hasn't been recharged but the drive belt is still on. where is this switch located and will removing the belt solve this problem ? thanks. Quote Link to comment https://www.bigmacktrucks.com/topic/34616-engine-fan-running-erratic/#findComment-231687 Share on other sites More sharing options...
maint1 Posted February 10, 2014 Share Posted February 10, 2014 At the fan switch you have wire from temp switch and high pressure switch. Disconnect high pressure wire. This will be better than removing belt. It is to kick fan on to reduce compressed head pressure. Take wire off and that will eliminate switch if faulty Quote Link to comment https://www.bigmacktrucks.com/topic/34616-engine-fan-running-erratic/#findComment-231692 Share on other sites More sharing options...
JBD15 Posted February 10, 2014 Author Share Posted February 10, 2014 just so am clear you are referring to the switch that is installed into top of engine into coolant with two wires off it ? which wire comes off ? all wrapped in a harness not easy to trace. Quote Link to comment https://www.bigmacktrucks.com/topic/34616-engine-fan-running-erratic/#findComment-231702 Share on other sites More sharing options...
maint1 Posted February 10, 2014 Share Posted February 10, 2014 To fan solenoid should have wire from temp sender in block, and wire from high pressure A/C line. Check continuity on wire from temp sensor to solenoid it should be easy to get to. then disconnect other wire. See if problem persists. Not saying that it is problem, but it eliminates it Quote Link to comment https://www.bigmacktrucks.com/topic/34616-engine-fan-running-erratic/#findComment-231710 Share on other sites More sharing options...
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