Paul,

  Whats the best stuff to use to flush the coolant system? I've
 heardof CLR, TSP
  (tried both), that stuff u can get @ auto part stores in the lil
yellow jugs, vinegar...and a 2-part system that is no longer
available, but apparently worked really well (go figure).

  I'm lookn for something that would be strong enough to flush the
  crude out of the heater core too..

  Thanks -Dan

 If you have a very dirty system, a few oz's of muriactic acid
 mixed todilute and then top up cooling system.  Run for about 15
 minutes.
  Drain
  and flush with water from the garden hose.  Pull the small hose,
 the cooler
  one, return to the engine and back flush the heater core.  If you
 canremove the pipe plugs from the block to fully drain it is
 good.  Refillwith new coolant and distilled water.  Distilled
 does not have the  mineralsin it that drop out and plug the
 cooling system.  A pressure test  is a goodidea to find out if
 you have any corroded welch plugs with pin holes inthem.

  Dale Davies

 Engines are designed to run hotter today than they did in the days
 before emissions raised their ugly collective heads.
 jd

 Be very careful with muriatic acid, It will eat right through aluminum.
 It is used to clean up cast cylinders after sticking 2 cycle pistons.
 It takes the aluminum residue off the walls, but left too long will
 start to dissolve everything.

 Randy



 Randy,

 Yes it is corrosive. That is why I said dilute it with water first
 and put in
 the cooling system. Then the flush process with back flush the
 heater core. On
 a dirty system it is effective. A small amount is required.

 Dale Davies

 A good rust remover I used was Oxalic Acid added to water in the
 cooling system and brought up to high temperature (~200  degrees).
 It was circulated for about 10-15 minutes and then drained and
 flushed.  Refill with water and add baking soda and bring up to temp
 which neutralizes the system.

 I haven't seen it on the market for a number of years, probably too
 strong for back yard mechanics.  I understand you can get it in a
 product called "Bar Keepers Friend Powder which contains Oxalic
 Acid.  I haven't used this product myself.  Check their web page:

 http://yhst-55367440605114.stores.yahoo.net/barkefrpo1.html

 Joel

I believe that oxcalic acid is also sold in Marine Supply Stores as a
Teakwood cleaner.
Herb




Saddle makers used it to get the Barges glue (contact cement) off
leather if they got sloppy.  Might ask one where he gets it.

Van Vannoy