Take them to a radiator shop and have them boiled out and pressure tested.
You'll sleep better. Replace the pencil zinc (assuming you have one) when
it's half gone.

"Houston" wrote in message
...
Can anyone tell me what I need to do to maintain my heat exchangers? I
know
they are in need of some maintenance and I would like to find some
instructions on how to clean them and with what, and replace the zincs.



Thanks



Houston