Whenever my 84 Vanagon is above normal operating temperature, such as
going over mountain passes etc, I turn on the rear heater to help cool
the engine.  The trouble is it blows a little coolant smell into the
van.  Normally hot air from the rear heater smells fine.  Is this
anything to be concerned about?  Is the rear heater core showing signs
of wear?

thanks,
Paul

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