Daryl Cyr Posted May 10, 2016 Share Posted May 10, 2016 Hi guys, i have a granite GU712 with MP7 and has engine overheat condition and is shutting down engine with overheat codes. Has Borg Waner fan clutch and has been replaced still has over heat condition. Just started overheating after 15 mile ride out of know where. Any ideas Thanks Daryl Quote Link to comment https://www.bigmacktrucks.com/topic/45153-08-mack-granite-gu712-engine-overheat-condition/ Share on other sites More sharing options...
hgfdg1990 Posted May 11, 2016 Share Posted May 11, 2016 (edited) Can be multiple things t, whens the last time the radiator has been washed out, also can you hear the fan come on very loud noise should be heard if not there right away you should know you have a fan problem. i Would also check the play on the water pump bearing/idlers,belt make sure its not to loose or anything is worn out. Also have you checked your lower rad hose if you can feel its not even close to being as hot as your upper hose then right away you know your thermostat is geting stuck closed. Also how fast is your tempature gauge rising? how long is it taking to overheat. Edited May 11, 2016 by Bigmackdaddy77 Quote Link to comment https://www.bigmacktrucks.com/topic/45153-08-mack-granite-gu712-engine-overheat-condition/#findComment-332915 Share on other sites More sharing options...
Daryl Cyr Posted May 12, 2016 Author Share Posted May 12, 2016 Hey all, The water pump was the issue i had the plastic impeller was spinning on the metal shaft... Mack has updated this water pump multiple times. Thanks daryl 1 Quote Link to comment https://www.bigmacktrucks.com/topic/45153-08-mack-granite-gu712-engine-overheat-condition/#findComment-333033 Share on other sites More sharing options...
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