Mack Gazza Posted April 14 Share Posted April 14 l have a 2004 Mack Qantum with a 470ccrs motor, have fitted a new fan clutch as the old one would not keep air, worked fine for a while but now it still turns off at the correct temperature but turns on way too early thus running with fan turning on and off too often. l would like to find which sensor or thermo switch sends the signal to the ECU for turning on the fan clutch. Thanks to all of you readers, Mack Gazza Quote Link to comment Share on other sites More sharing options...
mechohaulic Posted April 14 Share Posted April 14 can't help with that ;2004 is brand new to this ole man, LOL . you should receive an answer soon when these "youngsters" wake up . LOL now a R/U or similar system= is different. Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted April 14 Share Posted April 14 the coolant sensors are at the rear of the rearward water manifold. one is in the side and the other points toward the firewall. The A/C pressure switch also controls the fan. there may also be a setting in the EECU for ''Smart fan''. I cant remember if the air fan has that feature turned on. I also dont know how Aus. trucks are built, compared to U.S trucks.. jojo Quote Link to comment Share on other sites More sharing options...
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