KennethCarter

2004 Mack ch613 bran new (electronic fan clutch) engages and and disengages every 10-15 seconds. Coolant temp is reading 180 on and on computer. 
 

ac switch ( green one) looped the wires on the engine harness side and the fan still runs and shuts off. I checked the 3 connectors on the ecm clean no coolant or oil. No Freon in the ac system. 
 

new coolant sensor on back of water manifol. Coolant is full engine builds temp. 
 

Any idea why fan continues to engage or disengage. 

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 

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 

I will check I have the diesel laptop so I should be able to 

Don’t know truck was purchased with these issues 

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