cschaeffer6 Posted October 11, 2010 Share Posted October 11, 2010 when i start my 95 mack ch e7 427. the fan is on and clunks. if i can jump the wire to shut it off but i cant find diagnostics to see why the fan is on when cold any help would be great. Quote Link to comment https://www.bigmacktrucks.com/topic/16095-fan-making-noise-when-cold/ Share on other sites More sharing options...
JerryB Posted October 12, 2010 Share Posted October 12, 2010 your air pressure could be causing this.. On all our trucks the fan is engaged when engine is cranked and stays engaged until the air pressure raises to around 60-70 pounds. Quote Link to comment https://www.bigmacktrucks.com/topic/16095-fan-making-noise-when-cold/#findComment-65168 Share on other sites More sharing options...
cschaeffer6 Posted October 12, 2010 Author Share Posted October 12, 2010 it never did this before. its a loud clunking noise. is there a fix. Quote Link to comment https://www.bigmacktrucks.com/topic/16095-fan-making-noise-when-cold/#findComment-65177 Share on other sites More sharing options...
joes mack Posted October 12, 2010 Share Posted October 12, 2010 fan clutch is going out. we had one of the granites do this a couple of weeks ago put new fan clutch on and hasnt done it afterwords. joe Quote Link to comment https://www.bigmacktrucks.com/topic/16095-fan-making-noise-when-cold/#findComment-65180 Share on other sites More sharing options...
Rob Posted October 12, 2010 Share Posted October 12, 2010 it never did this before. its a loud clunking noise. is there a fix.As mentioned the fan clutch is on it's way out. There are rebuild kits available and they are not difficult to work on.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/16095-fan-making-noise-when-cold/#findComment-65182 Share on other sites More sharing options...
truckboy Posted November 9, 2010 Share Posted November 9, 2010 replace the blower motor. Quote Mack trucks | Cheap used cars Link to comment https://www.bigmacktrucks.com/topic/16095-fan-making-noise-when-cold/#findComment-66582 Share on other sites More sharing options...
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