On 12/27/2015 12:54 PM, Snuffy "Hub Cap" McKinney wrote:

I did the garden hose thing on a old Mercruy Comet I once had, I let
the water run through the core and into a 5 gallon bucket just to see
what and how much came out. A lot of rust, actually a whole lot of
rust. I suppose that heater core was the low part of the cooling system.
I hooked the hoses back up and the heater worked liked new after that.
Prestone makes a kit you can cut the hoses and do the same thing which
might or not be a good thing. This one is on ebay but the auto parts
stores have them.

http://www.ebay.com/itm/Prestone-Ant...-/221978480521