I had to replace the front heat exchanger on my 18 Apex and when removing it (yes, I was able to without pulling the motor) I noticed a wear spot on the front side of the heat exchanger (facing the motor) that I think could be problematic for others who own the late model Apex's (i.e. 11-18 vs 06-10). There is a hose that is located between the rear of the motor and the front side of the heat exchanger on the clutch side that is braided on the newer Apex's. You can see this hose when looking between the primary and secondary clutches and looking at the area between the backside of the motor and the heat exchanger. Not sure if mine was an isolated incident where the hose was too close to the exchanger or if all of them are like that. I checked the same hose on my 08 Apex and the hose on it is actually larger in diameter and is not braided; hence why I thought this was only applicable to the later model years. This braided hose was rubbing up against the top corner of the heat exchanger and actually wore a pretty decent groove in it. I only had 6000 miles on my 18 Apex when I found mine. Can only image how much worse it could be on others with more time and miles. I ended up placing a larger diameter hose over the braided hose to keep it from wearing into my new heat exchanger; just didn't have one in the size I needed that was black. Not saying that is what happened here but if something like that were to have happened to the front heat exchanger, you would not see any damage from the back side like you would if a stud or rock pierced the exchanger. Additionally, something like this or a similar issue (i.e. one of the hose connections on front side of heat exchanger popping off) would also explain why there was coolant on both sides after removing both side panels.
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