[ROVERNET - UK] P6B Heater / Cooling system- To flush or not to flush?

[Peter Mitchell]

RE: My P6B's heater.  I followed recent excellent Rovernet advice regarding
the clearing out of a heater core by running some compressed air through it.
It worked a treat, and some granulated mineralised matter shot out, and I
can 'pass water' through the heater both ways. 

My query is:  Now that I have a flow through the heater core, should I run
some radiator cleaner through the system to complete the process?  

My local Rover mechanic is concerned that with an old car I might loosen
some matter that is blocking up a potential leak.  On the other hand, if
there is a leak waiting to occur, surely better to bring it on and get the
problem sorted.

With temperatures in the mid to high 30's here, and an air conditioner to
support, I do want to keep the cooling system as efficient as possible.  


Advice appreciated. 

Kind regards

Peter Mitchell
Perth W/Aust