Question on flushing cooling system
 

My orginal Champion aluminum radiator has developed a small leak. I used JB weld in an effort to seal up the leak. No worky, so I purchased another Champion radiator to replace it.

I'll also be changing my heater core and thermostat while I have the coolant out.

I'm curious about using the cooling system flushes or just flushing out the system with a garden hose stuffed down the hole in the intake manifold where the thermostat housing is, while the radiator is out.

Are the cooling system flushes worth it?

Re: Question on flushing cooling system
 

The normal parts store flushes can break up deposits that regular garden hose flushing will not get. If you really have a neglected system, muriatic acid will clean the heck out of the jackets, but are tough on core plugs and anything that is the least bit weakened by corrosion and age. Also stinks and can be harmful to skin.

Re: Question on flushing cooling system
 

Using parts store flush is fine and can be done multiple times for bad build up. I wouldn't use Muratic acid for any reason as it destroys aluminum rapidly and any benefit is heavily outweighed by the damage it'd do