Brian Wise Posted March 24, 2017 Share Posted March 24, 2017 Hello, my name is Brian and am an a/c mechanic. I have a customer with a 2015 cxu613. The problem im having is with the fan clutch not engageing at all allowing the head pressure to sky rocket. I have ran the truck for at least 30 mins and have never seen fan engage. I do have 12v going to it but not sure which wire should have the 5 v computer reference signal. I believe im dealing with a bad fan clutch. Anyone have input that may be helpful to me? Quote Link to comment Share on other sites More sharing options...
Macktech689 Posted March 25, 2017 Share Posted March 25, 2017 The easiest way to check to see if the fan is capable of engaging is to disconnect it from the engine harness and run the engine over 1000 rpm. The fan should fully engage in around 10 seconds, if it doesn't replace the fan drive. Loss of voltage triggers a limp home mode, keep in mind the fan drive will rarely fully engage during normal operation 75 to 80% is normal. Quote Link to comment Share on other sites More sharing options...
Truckerman19 Posted April 15, 2019 Share Posted April 15, 2019 I have a 2011 MACK CXU 613 I think my fan Clutch is bad the fan seems to run all the time so my question is could this cause my A/C to blow warm air? Quote Link to comment Share on other sites More sharing options...
tjc transport Posted April 15, 2019 Share Posted April 15, 2019 no. fan clutch not locking will cause no ac condition at idle or while not moving. the ac needs airflow over the condenser to work. if the fan clutch is constantly locked it will be blowing air over the condenser cooling the refrigerant. i would suspect low refrigerant level. with the ac on, is the clutch engaged? Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment Share on other sites More sharing options...
turckster Posted April 16, 2019 Share Posted April 16, 2019 There are 2 types of electronic viscous fan clutches, the Borg-Warner and the Behr type fan clutch. The Borg-Warner is huge and probably what is on the engine. As stated above, unplugging the B/W fan clutch should engage it within 30 seconds according to service info (usually happens immediately). If the engine is equipped with the Borg-Warner fan clutch and it does not engage then it must be replaced and updated to the smaller Behr type fan clutch and kit. It also needs to have the EECU software updated. Quote Link to comment Share on other sites More sharing options...
Ballo70 Posted September 10, 2021 Share Posted September 10, 2021 I’m having somewhat of the same problem hoping someone can help. 2013 CXU613. Air conditioner blows warm to hot when idling, going down the road it’ll freeze you out. Have had system vacuumed & recharged, expansion valve replaced, disconnected fan engine harness and it kicks in fine and sounds strong. I did notice that while trying to figure it out at idle sometimes fan will kick in but sounds weak or kick in for a split second and that’s it. At one point it kicked in a couple times then seemed to quit kicking in at all. Any help would be greatly appreciated! Quote Link to comment Share on other sites More sharing options...
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