cxn613 Posted July 25, 2016 Share Posted July 25, 2016 a/c blows cold air while driving, but once sitting still blows warm air. the fan clutch never cycles while sitting still. fan clutch does work fine when it needs to cool the coolant down while driving Quote Link to comment https://www.bigmacktrucks.com/topic/46207-cxu-ac-problem/ Share on other sites More sharing options...
hatcity Posted July 25, 2016 Share Posted July 25, 2016 bump the throttle to about 900 rpm Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/46207-cxu-ac-problem/#findComment-340389 Share on other sites More sharing options...
cxn613 Posted July 26, 2016 Author Share Posted July 26, 2016 Doesnt help. With gauges on when high pressure side goes up to 250/300 it kicks compressor off but fan clutch doesnt engage. Quote Link to comment https://www.bigmacktrucks.com/topic/46207-cxu-ac-problem/#findComment-340497 Share on other sites More sharing options...
thundervalley Posted August 12, 2016 Share Posted August 12, 2016 Been fighting with AC stuff on my 09 CXU 613 also. For testing, there is a sensor and a switch on the AC lines. If you jumper the switch connector and disconnect the pig tail on the sensor does anything change or do you have the same issue? Mine is doing similar and it looks like its that sensor. I could shake the wires around for the clutch and it would work for a minute but I ended up having two issues with one masking the other. I just ordered the manual from MACK, let me know your findings and I will see if I can help you out more once the book gets in. Quote Link to comment https://www.bigmacktrucks.com/topic/46207-cxu-ac-problem/#findComment-342080 Share on other sites More sharing options...
cxn613 Posted August 17, 2016 Author Share Posted August 17, 2016 I found on mine that the green pressure switch wasnt screwed in all the way. Been fighting this problem of no cold air sitting still when engine is hot for a few years and all it is was the switch not screwed in all the way. Now fan will kick on sitting still when pressure gets high. Quote Link to comment https://www.bigmacktrucks.com/topic/46207-cxu-ac-problem/#findComment-342697 Share on other sites More sharing options...
Mack13 Posted August 15, 2018 Share Posted August 15, 2018 Having issues with the A/C. The A/C blows but not into the cabin but somewhere inside the dashboard. Once switched of for a couple seconds it turns on for a couple miles and again same story. I changed the resistor as this was corroded because of the fact that the air dryer wasn’t able to push the water out and the water was running back into the cabin. What could that be. Anyone any similar issues or advises on how to fix the issue? I know that the pipes might be blocked so the water runs into the cabin but what about that tack that the A/C is only blowing behind the dashboard and not into the cabin? What is causing this? Quote Link to comment https://www.bigmacktrucks.com/topic/46207-cxu-ac-problem/#findComment-404162 Share on other sites More sharing options...
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