Danny952 Posted April 20, 2021 Share Posted April 20, 2021 I have an 07 mack vision with an E7 427. It bobtails fine but when I put a load behind it, it overheats n shuts down. Could it be thermostat? Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/ Share on other sites More sharing options...
Joey Mack Posted April 21, 2021 Share Posted April 21, 2021 yes, does the fan come on when needed? is the radiator free of dirt? is the system full of coolant and not water? is your gear selection correct? and so on.... is there a stuck brake? get my point? Please post more info about the truck and how you work it. One of us or many of us will get you the answer... Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472757 Share on other sites More sharing options...
Danny952 Posted April 21, 2021 Author Share Posted April 21, 2021 Thank you. Today was my first day on the road with it. The fan stays engaged all the time. I shifted down twice on a mile long hill n was running at 1400 rpm when it heated right up n the shutdown came on Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472758 Share on other sites More sharing options...
Joey Mack Posted April 21, 2021 Share Posted April 21, 2021 you can always replace the thermostat, and put fresh coolant in too start with after a good visual inspection of all coolant lines and "cores" if you have a bunk, check it... is the fan belt loose? did you turn the heat on high to see if the temp dropped? what was the recent repair history????? anyway, i'm puking out a bunch of Q's .... Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472760 Share on other sites More sharing options...
Danny952 Posted April 21, 2021 Author Share Posted April 21, 2021 No I didn't have the heat on. I turned it to cold because it was still warming the cab with the fan off. Right before I picked up the truck they were working on the EGR. I now have ANGER fault as well Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472761 Share on other sites More sharing options...
Danny952 Posted April 21, 2021 Author Share Posted April 21, 2021 EGR fault. the phone auto corrected the text 1 Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472762 Share on other sites More sharing options...
Joey Mack Posted April 21, 2021 Share Posted April 21, 2021 ok... now your on to something.... Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472763 Share on other sites More sharing options...
Danny952 Posted April 21, 2021 Author Share Posted April 21, 2021 This doesn't sound good Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472764 Share on other sites More sharing options...
Joey Mack Posted April 21, 2021 Share Posted April 21, 2021 so its an ASET CEGR engine? When you said, "first day on the road with it" did you mean "ever" or after the EGR repair? Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472765 Share on other sites More sharing options...
Danny952 Posted April 21, 2021 Author Share Posted April 21, 2021 First load ever Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472766 Share on other sites More sharing options...
Danny952 Posted April 21, 2021 Author Share Posted April 21, 2021 Yes the fault code reads ASET EGR Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472767 Share on other sites More sharing options...
Joey Mack Posted April 21, 2021 Share Posted April 21, 2021 ok... well.. you dont know the truck yet, ok. I suggest a thorough visual inspection, "By You" and get familiar with your new truck before you spend money on repairs yet. You may find a pinched hose or a leak or something silly to cause issues. then go "up" from there. There will be several people here that can advise you. Keep posting... Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472768 Share on other sites More sharing options...
Danny952 Posted April 21, 2021 Author Share Posted April 21, 2021 Thank you. I'll get right on it in the daylight Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472769 Share on other sites More sharing options...
Joey Mack Posted April 21, 2021 Share Posted April 21, 2021 Good luck Danny... Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472770 Share on other sites More sharing options...
Danny952 Posted April 21, 2021 Author Share Posted April 21, 2021 Thank you Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472771 Share on other sites More sharing options...
Vmac3 Posted April 21, 2021 Share Posted April 21, 2021 When you say the fan is on all the time, is it freewheeling or is it pulling air through the radiator? V Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472777 Share on other sites More sharing options...
Danny952 Posted April 21, 2021 Author Share Posted April 21, 2021 It might just be free wheeling because it doesn't look like its spinning very hard Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472780 Share on other sites More sharing options...
Vmac3 Posted April 21, 2021 Share Posted April 21, 2021 When that fan engages you will know that it's on. V 1 Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472783 Share on other sites More sharing options...
Mark T Posted April 21, 2021 Share Posted April 21, 2021 Is the radiator clean (externally) ? Not blocked up with dirt or something ? not allowing air to flow through it. Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472788 Share on other sites More sharing options...
mrsmackpaul Posted April 21, 2021 Share Posted April 21, 2021 Does it heat up in minutes or over say half a hour ? Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472791 Share on other sites More sharing options...
Danny952 Posted April 21, 2021 Author Share Posted April 21, 2021 I found the problem. It is the fan clutch. I thought it was locked on all the time but I test drove it n it kicked out n the clutch is so worn I almost put the fan through the radiator. Apparently it was kicking out every now and then n when it did kick on it was slipping 1 Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472792 Share on other sites More sharing options...
Danny952 Posted April 21, 2021 Author Share Posted April 21, 2021 In the process of getting a rebuild kit now 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/66578-overheating/#findComment-472793 Share on other sites More sharing options...
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