CCM Posted July 31, 2017 Share Posted July 31, 2017 Anyone have any info on the electric/viscous fan clutch for the MP7 engines. The customer is complaining of the engine running warm and the fan doesn't come on soon enough. We have updated the clutch to part #85115602 if that helps with trying to find info or some kind of a bulletin. Maybe it's a programming or parameter setting? We have also replaced the water pump and thermostat. The radiator was replaced not to long ago also. As long as you have to electrical unplugged and the fan runs constantly it cools just fine. Quote Link to comment https://www.bigmacktrucks.com/topic/50627-mp7-running-hot/ Share on other sites More sharing options...
Mackpro Posted July 31, 2017 Share Posted July 31, 2017 (edited) Did it have the giant Borg Warner Cool logic fan clutch on it and you replaced it with the smaller Behr clutch? And does it have an Allison trans Edited July 31, 2017 by Mackpro Quote Link to comment https://www.bigmacktrucks.com/topic/50627-mp7-running-hot/#findComment-376274 Share on other sites More sharing options...
Mackpro Posted July 31, 2017 Share Posted July 31, 2017 I believe you have the Behr fan going by the part number. We have little to no problem out of them. This is the Cool Logic that was a total failure . They dont even make them any more. Cool Logic Fan.pdf Quote Link to comment https://www.bigmacktrucks.com/topic/50627-mp7-running-hot/#findComment-376277 Share on other sites More sharing options...
CCM Posted July 31, 2017 Author Share Posted July 31, 2017 Trans is a EATON autoshift. Took off a behr fan clutch #21046590 Quote Link to comment https://www.bigmacktrucks.com/topic/50627-mp7-running-hot/#findComment-376286 Share on other sites More sharing options...
CCM Posted August 4, 2017 Author Share Posted August 4, 2017 Still working on this overheating issue. Can't seem to get a clear cut answer on if you should hear the fan when PTT is showing engagement at anywhere from 86% to 99%. Coolant temp will run as high as 223 degrees with the fan showing lock up but wont cool the temp down. If the harness is disconnected so the fan runs constant you hear the fan and the temp stays normal. Quote Link to comment https://www.bigmacktrucks.com/topic/50627-mp7-running-hot/#findComment-376650 Share on other sites More sharing options...
Mmt Posted August 9, 2017 Share Posted August 9, 2017 Yes you should hear the fan at anything above 85%. Was the fan always a viscous fan? If it was changed from a different drive it will need to be programmed for the correct over drive % and fan surface area as well as what the eecu is reading from thefan harness. If it always was a viscous fan then is sounds like there might be a problem with the 5volt reference. The boost temp and pressure sensor, egr delta p, and fuel pressure sensor all are Sharing the same 5volt reference from the eecu. The egr delta is the common issue with messing with signals on the reference line. Check the eecu plugs for oil as well. This shorts out the signals. The delta p wires will rub in the loom and short out causing the the fan not to work correctly and boost temps to read off. The regens will perform are they should as well. One more thing check for pin fretting I. All the connection on these sensors. If brown dust is found repair the pins or replace them. Quote Link to comment https://www.bigmacktrucks.com/topic/50627-mp7-running-hot/#findComment-377031 Share on other sites More sharing options...
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