Freightliner Cacadia ..Cooling ..Fan Clutch issue ??

2009 freightliner cascadia w dd15 engine ..when loaded ...temp goes disturbingly high ..(gauge needle goes to about the 3 o'clock position) ..then retreats down to 205-210 etc ...I never hear the fan clutch kick in although it must be as the temp drops when it gets to a level ..(again the 3 o'clock position) ...been fighting this issue for about a month now ..then ...I was climbing the cajon pass last week and a hose popped on me shutting me down on the grade ... talking w my boss ..he says that freightliner mech told him the temp action is normal as the fan clutch kicks in at about 223 ..which ..appears to be correct as I monitor the gauge ...just doesn't seem right though ...as the temp climbs to almost the red on the gauge ...and then the hose popped on me ...my company mech said it was an older hose but ..doesn't running the temp that high have an impact on the hose strength? ..running up and down like that would tend to weaken hose(s) integrity...no? ...just looking for answers here as I am hitting the road again today and would like to be prepared for what I think is the inevitable failure ...again
..to be clear ..waiting for this to be repaired ...I was slipped into another Freightliner ..2007 Columbia ...and the fan clutch came on ..distinctively ..w the temp staying at satisfactory levels ..so ..I still feel their is something amiss here ...any thoughts from you guys??

 

Interesting ...i will pass that along ...I'm not completely incapable of turning a wrench or two ...do you know where the sensor is located? ...if too much of an issue I will not attemp though ...thanks for the input Flex ...

 

I'm driving an 09' ...not sure I have the dash switch ...(sorry to say I dont know everything about this model ...I do know the shutdown over ride though lol..)

 

thanks to all ...been a few weeks now on the new hose ...I guess it just doesnt sit right with me to see the temp gauge rise to the '3 0'clock' position ...although ...at that position the temp is at approx 225 ...and the fan kicks in at that point and it starts to recede ..I would like to have one of the option switches engage the fan manually ...and hit it at say 210? ...and keep it from dancing with the red line ...ya know? ...anyway ..thanks again truckers! ..stay safe!