losing water out of back engine
losing out of back engine
Is this a good question?
I was a Chevy tech for 20 yrs...couple of areas to look.
There could be a connector at the rear of the intake manifold that connects a metal pipe from the manifold to the heater core. Those get corroded over time and can leak.
Also the intake manifold gaskets themselves can leak in that area too.
You can rent a coolant pressure tester from the parts store and pressurize the system to locate the leak.
Hope this helps
If it is leaking out of the back of the engine, it is probably the freeze-out plugs as mayer stated...low coolant will cause the heater to work intermittently or not at all. Check closer before you get the heater core replaced.
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