Coolant Leak From Heater Core on Isuzu Pickup

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 123,333 (82,000–148,000)
6 model years affected: 1990, 1991, 1992, 1993, more1994, 1995
9 people reported this problem
Viewing 1 - 3 of 3 problem details
Coolant leak in heater core at 82000 miles.
Heater core leaked. This is a big pain to fix because the whole dash needs to be removed... No access panel.
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.