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Q:

heater core on 1990 GMC S15

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
How do I change heater core ?
(1) Answer
Here is a link to a web site that has very good repair instructions for your vehicle.

http://bit.ly/mitchell_repair_manuals_online