72 K5
You're having about as much luck as I am trying to find out about heater core replacment on an AC truck.... not sure why, maybe not many AC trucks out there so knowledge base is limited...... I spent about an hour yesterday looking through old posts to no avail however, I did find a post from Wes at "Classicheartbeat" talking about differences between imported and American made heater cores. I haven't sent him an email yet but plan to contact him to buy and get info. on my heater core replacment.... you might give him a try, listed on the sticky "help suport those who support us".
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