1997 Plymouth Voyager

1997 Plymouth Voyager 126,350 miles

I am having a problem with getting HOT heat.I changed the thremostat, there is no anti freeze leaking but the heat still comes out luke warm. There is an electronic box under the glove box that makes a funny noise when the ignition is turned on.I have manually opened and closed this but there has been no change in the heat temp. What do I do snow is about to fly?
November 28, 2006.

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