Coolant Leak From Heater Core on Isuzu Pickup

The heater core may leak coolant, excess coolant loss can result in engine overheating. Our technicians tell us a revised, copper heater is available to replace the original aluminum one.

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Average mileage: 123,333 (82,000–148,000)
6 model years affected: 1990, 1991, 1992, 1993, more1994, 1995
9 people reported this problem
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problem details
1993 Isuzu Pickup 82,000 mi,
Coolant leak in heater core at 82000 miles.
1994 Isuzu Pickup 140,000 mi,
Heater core leaked. This is a big pain to fix because the whole dash needs to be removed... No access panel.
1993 Isuzu Pickup 148,000 mi,
I am asking for my mechanic to test the core if it is something that is done without special equipment- then i can determine if that was the problem- I assume it is because the previous owner had installed a new radiator. I have not found out much in regard to how a test is done or where to find a copper heater core.