EscambiaCounty Posted April 6, 2011 Share Posted April 6, 2011 I have a 2007 Mack CHN 613. The cooling fan is on all the time. Will not disengage. I have replace fan clutch($700) and check the fuses. Is there something else I need to look for or check? This fan clutch is all electric. Thank for any help. Quote Link to comment Share on other sites More sharing options...
rhasler Posted April 6, 2011 Share Posted April 6, 2011 I have a 2007 Mack CHN 613. The cooling fan is on all the time. Will not disengage. I have replace fan clutch($700) and check the fuses. Is there something else I need to look for or check? This fan clutch is all electric. Thank for any help.Make sure the freon high pressure switch is plugged into the sensor and that the sensor is not stuck. Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment Share on other sites More sharing options...
cgallamore Posted April 6, 2011 Share Posted April 6, 2011 i just had my A/C serviced, i think the put in to much freon, my cooling fan is engauged way to much. near constant.. Quote http://www.bigmacktrucks.com/uploads/1272400769/gallery_4852_794_314995.jpg Link to comment Share on other sites More sharing options...
Gambi80 Posted April 6, 2011 Share Posted April 6, 2011 i just had my A/C serviced, i think the put in to much freon, my cooling fan is engauged way to much. near constant..What's it like to be in weather that requires the A/C...?? I don't remember what it's like. Quote Ever wonder how a blind person knows when to stop wiping? Link to comment Share on other sites More sharing options...
Mackpro Posted April 7, 2011 Share Posted April 7, 2011 I have a 2007 Mack CHN 613. The cooling fan is on all the time. Will not disengage. I have replace fan clutch($700) and check the fuses. Is there something else I need to look for or check? This fan clutch is all electric. Thank for any help.If its the Behr electric viscus fan clutch, it never really fully disengages like the air fan clucthes, At the shop we can easly hook up the laptop and see whats causing the fan to stay engaged (A/C high pressure). If every thing is right the only thing that turns on the fan clutch is high coolant temp, high intake temp and high AC pressure. I would first make sure the ing key is off and unplug all 3 engine ECM connectors and see if the pins are corroded from antifreeze seeping into the harness from the low coolant sensor (seen this many times). 2 Quote Link to comment Share on other sites More sharing options...
EscambiaCounty Posted April 7, 2011 Author Share Posted April 7, 2011 Thanks everyone for sending me a reply.I will check everything, everyone said and let yall know if that fix it. Thanks again. Quote Link to comment Share on other sites More sharing options...
EscambiaCounty Posted April 19, 2011 Author Share Posted April 19, 2011 First I want to say thanks to everyone that help me. After checking a little more found out that the high pressure switch on AC system was bad. It is working great. Thanks again. Quote Link to comment Share on other sites More sharing options...
jewels Posted April 23, 2011 Share Posted April 23, 2011 Ac fan switch. Quote Link to comment Share on other sites More sharing options...
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