I have contacted Mishimoto. They told me they are going to being looking into the potential problem of the stock fan blade impacting the rad core. Whats happening is the fan blade tips are hitting the lip of the top end tank, if it catches just right, this happens:
I'm moving onto my 4th. Someone else in another thread spoke up and said he has the same issue. If you own one with a stock clutch fan, please check for any impact damage to your fan blade tips carefully. If anything shows impact, be sure to check your radiator core. Please report back because if this is more than just an isolated incident, they will redesign so its not an issue anymore. If possible, post pictures.
I have always been in support of Mishimoto since i've owned them. They improved my temps significantly, even over my $500 Fluidyne, and the warranty is simply unbeatable, so don't be scared if you were thinking of purchasing one, this issue may only be effecting a small percentage of users.
Edit: if you are running a fan shroud (I was not), be sure to check that for impact as well (where the tips of the blade would meet it) since it will only add more depth to the lip of the rad.
I'm moving onto my 4th. Someone else in another thread spoke up and said he has the same issue. If you own one with a stock clutch fan, please check for any impact damage to your fan blade tips carefully. If anything shows impact, be sure to check your radiator core. Please report back because if this is more than just an isolated incident, they will redesign so its not an issue anymore. If possible, post pictures.
I have always been in support of Mishimoto since i've owned them. They improved my temps significantly, even over my $500 Fluidyne, and the warranty is simply unbeatable, so don't be scared if you were thinking of purchasing one, this issue may only be effecting a small percentage of users.
Edit: if you are running a fan shroud (I was not), be sure to check that for impact as well (where the tips of the blade would meet it) since it will only add more depth to the lip of the rad.