heater core

[DOUG ODOM <popms@thegrid.net>]

        List, I have a friend ( yes Keith I do ) that has a 1990 Chevy 350 pick
up truck. This thing has gone through four heater cores is the last 6
months. The new cores are all aluminum not brass or copper. I have put
on 4 extra ground wires. The electrolysis will not even read on my volt
meter. What I am asking is if there is a bad batch of heater cores on
the market? He is having it changed today and going to bring me the old
one to look at. The guy at the radiator shop is no dummy and he's
stumped also. In 18 years he has never seen this big a problem. I told
him I would put it out on the list and see if someone else has run into
this lately. Any help?     Doug Odom in sunny big ditch

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