[Bob Lincoln]

Maybe you damaged the heater core by twisting, maybe by flushing. I never twist the hoses, as it does stress the outlet pipes, and they are soft. I always cut the hoses off with a razor knife and peel them away.

Can you spot whether the leak is inside the car or outside?

 

[dh114]

Thanks for the quick reply!

The leak is definitely on the outside. To me it looks like the hoses aren't tightened onto the inlet and outlet pipes. I start the engine and I can see antifreeze rushing out the end of the hoses. It looks like I don't have clamps installed but, I do.

I guess I don't know how to explain it. I'm running on about 3 hours sleep in the past 36 hours.

Danny

 

[A.j. Schreiber]

did you clean up the metal inputs of the heater core where the hose connect? maybe some corrosion isnt allowing for the hose to seal properly

 

[John Wood]

It sounds like you put new hoses on it and checked the clamps (of course double check). If there was twisting or tugging involved in getting the old hoses off, you may have cracked a joint where the copper inlet or outlet tube is welded or brazed to the heater core body. I once did that in another lifetime (maybe 40 years ago). Like Bob said, it is much safer to slice the hoses with a razor knife if they are stuck, and then peel them back with a flat screwdriver, gently pressed into the cut (or whatever method it takes to keep from putting strain on the fittings).