[Karl Bebout]

Decades ago, I poured a tube of Alumaseal into the heater hose on my '65 SS Chevelle and that took care of my heater core leak for at least the 5 years I had the car. Yes, the heater worked just fine and I used it a lot back in the Ohio hinterlands. Another benefit of the product is that it is a water pump lubricant and I never had to change my pump on that car and I never had any cooling issues.