Leaking Heater core in my 1955 Chevy

Asked by Oct 14, 2014 at 06:28 PM about the 1955 Chevrolet Bel Air Base

Question type: Maintenance & Repair

My heater core is leaking.  It only happens when it is started up and runs until warm. Then it leaks about 1 tea spoon of anti-freeze on the floor and then stops.  I can run it for hours afterwards and nothing more leaks out.  This happens every time I start it up and it warms up a little, not real hot.  What can it be?  The heater core and valve is brand new.

1 Answer


Check your heater hose and or clamps. It may have a small crack that self seals itself when the hose gets hot and expands. It also could be dripping and evaporating until the engine is turned off and the heater parts ae cooled down so it does not evaporate. You also may have a leak in your heater core itself. These old ones were made of copper and put together with silver solder and over the years could develop a crack or leak. These should be easy to remove and have checked. The hoses are an easy start to replace. If new hoses and clamps do not fix it, next is pulling the heater core. It may be cheaper to buy a new one, but these old ones are also an easy fix if you or someone know how to do it. Find someone in a radiator shop that has gray hair and winkles, He should know.

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