1991 Trail Boss 350L 2x4 HOT light
#11
02-18-2017, 04:38 PM
Join Date: Feb 2017
Location: Northern Ontario
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No this wouldn't cause the engine to over heat,but it needs to be fixed so the fan can cycle on and off properly which extends the life of the fan. If one hose side is hot and one cold on the radiator then still sounds like trapped air or a dirty radiator. You can generally open the radiator cap and see if coolant is at least flowing back,plus a good idea on this machine to bleed the head bolt first,jack the front end up and leave the radiator cap off. Air pockets can also be between the radiator and the water pump.This would help take care of that.
1) Open the burp bolt (10mm on top of engine)
2) Jack the front end up
3) Remove radiator cap
All with the engine off.
Correct me if I am wrong on this. You have been very helpful thus far.
#12
02-18-2017, 04:48 PM
Polaris ATV Expert
Retired and loving it!
Retired and loving it!
#13
02-18-2017, 05:33 PM
Join Date: Feb 2017
Location: Northern Ontario
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#14
02-18-2017, 05:49 PM
Polaris ATV Expert
Retired and loving it!
Retired and loving it!
Remove the radiator cap.Open the bleed bolt until nothing but straight coolant flows out then close the bolt. Jack the front end up until the tires are a few inches off the ground. Crank it up and let it get warm. Top off the radiator if the coolant level goes down. You can help remove trapped air by squeezing the hoses while it's running.With the fan hooked direct and running,air bled from the system,the hot light shouldn't come on.If its does,then it's back to the radiator,whether it's dirty or even stopped up if hoses are warm only on one side.Again you can usually tell if coolant is circulating through the radiator meaning the water pump is ok.