KennethCarter Posted November 12, 2023 Share Posted November 12, 2023 2004 Mack ch613 engine fan stays on and won’t shut off, fan spins but doesn’t free spin, coolant temp is good, I jumped the ac switch ( green one) and no changes. Electronic fan clutch I got wiring diagrams from Ballard to chase wires. Has anyone ran into this before. also engine brake doesn’t work as well, cruse control does and the clutch switch is working because it disengages the curse control. Thier is abs light on for the right axle sensor( replaced sensor and tone ring due to damaged. Have to drive the truck to clear the light the computer won’t get it to clear. Could the abs light be affecting the Jake brake? I thought I read something that it will effect it Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted November 12, 2023 Share Posted November 12, 2023 was the E.E.C.U. replaced/flashed right before this happened? Quote Link to comment Share on other sites More sharing options...
KennethCarter Posted November 13, 2023 Author Share Posted November 13, 2023 Don’t know truck was purchased with these issues Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted November 13, 2023 Share Posted November 13, 2023 Can you go in the EECU and check the smart fan setting and engine brake on/off setting? Quote Link to comment Share on other sites More sharing options...
KennethCarter Posted November 13, 2023 Author Share Posted November 13, 2023 I will check I have the diesel laptop so I should be able to 1 Quote Link to comment Share on other sites More sharing options...
KennethCarter Posted November 15, 2023 Author Share Posted November 15, 2023 New cooling fan sensor, found a fan override harness behind the dash plugged the engine shut down rocker switch in to see if that would override the fan and shut it off and nothing continues to run any ideas Quote Link to comment Share on other sites More sharing options...
Mackpro Posted November 17, 2023 Share Posted November 17, 2023 https://pdf4pro.com/cdn/service-bulletin-mckenzie-tank-lines-a3dd0.pdf This is the bulletin on your fan clutch. In the bulletin it tell you to ground one wire and supply 12volt power to another. This should disengage the fan after a few minutes of running . If not then the fan clutch is bad. Quote Link to comment Share on other sites More sharing options...
Mackpro Posted November 17, 2023 Share Posted November 17, 2023 I made a jumper harness just for this reason. Quote Link to comment Share on other sites More sharing options...
KennethCarter Posted November 28, 2023 Author Share Posted November 28, 2023 Update on fan issue, checked for power and ground on engine harness to fan clutch. When engine running running i have power and ground, I unplug fan clutch while running and it didn’t disengage I also put power and ground to it and it still doesn’t stop so ruled out bad fan clutch Quote Link to comment Share on other sites More sharing options...
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