What should I use to clean the coolant passages in the rotor housings? Right now the passages have this red-brown rust-like stuff in them.

 

Small wire brush and elbow grease.

There are various chemical dips but I have never tried any of them.

 

i let them sit overnight in purple power

 

or don't bother, the passages will get mucked up again in a matter of weeks. you can clean them if you want but believe me it is a wasted effort.

i just get as much of the surface crap off as possible with soapy solution and compressed air, the rest gets left on and it will give no adverse affects.

 

I had the same problem when I fisrt got my car and had to replace the radiator. The coolant had turned orange from all the rust particulates. I ended up having to run the motor while flushing the system with a hose for over an hour before it ran clear. Haven't had any problems since.

It cools much better now, but that could just be the fluidyne

 

u cant use purple power on alumion it pits it im purty sure

 

Get them "hot tanked" from a machine shop.
How about pressure washer?


-Ted