pmm93 Posted April 12, 2017 Share Posted April 12, 2017 3-4 times this issue has occurred, local dealer no help - only provides temporary fix. Mack truck overheating March 31 backed in to unload, high temp light came on. Pulled designated PTO and 30 sec in engine shut down to save motor. Fan wasn't on high - should have been. After taking to our company garage we called outside garage and they recommended towing it to their shop. They called and said it would be ok drive their but we had it towed to be cautious. The truck was also experiencing park regan problems day before. Exhaust temp wouldn't reach over 600 degrees but needs to 1200 to regan. The outside garage worked on regan issue - they diagnosed as "clogged radiator. Lead to whole new fan job being done on truck. Truck still ran at 200 degrees - fan still not kicking in high. The outside shop was going to install override switch but didn't follow through. Called outside shop again but shop said it was a clogged radiator issue. But they replaced so how could it be the same issue?? Vin number: 1M2AX09C0FM022641 Quote Link to comment https://www.bigmacktrucks.com/topic/49518-overheating-and-emission-issue/ Share on other sites More sharing options...
Mackpro Posted April 12, 2017 Share Posted April 12, 2017 Your truck came with the Borg Warner HDMS fan clutch. They are junk and we have changed many of them , sometimes 2 or 3 times on the same truck. Mack no longers sells them. They now have a change over kit to the smaller/better Behr fan drive. You can install the kit yourself but a dealer has to download the new program for the new fan type of it wont work. Also pull water pump and check for slipping impeller. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/49518-overheating-and-emission-issue/#findComment-367147 Share on other sites More sharing options...
Mackpro Posted April 12, 2017 Share Posted April 12, 2017 Behr Fan kits.pdf Quote Link to comment https://www.bigmacktrucks.com/topic/49518-overheating-and-emission-issue/#findComment-367148 Share on other sites More sharing options...
Mackpro Posted April 12, 2017 Share Posted April 12, 2017 As far a regen, a clogged 7th injector or bad AHI module could be the problem. And we have see turbos cause it as well. scan0446.pdf Quote Link to comment https://www.bigmacktrucks.com/topic/49518-overheating-and-emission-issue/#findComment-367150 Share on other sites More sharing options...
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