Ron, you might like to mention in your article that a build up of water in the air intake which flows into the heater can be caused by the stubby drain pipe, which is part of the heater box, getting blocked. This outlet has a hose on it which goes down the side of the heater to the side of the coil in the engine compartment. It often goes a bit flat causing a restriction which means it's more prone to blockage. Don't rely on the mesh to keep all of the dirt out of the intake.
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