Abstract: A coolant-filled heat exchanger is provided. The heat exchanger includes an inner u-shaped tube having first, second, and third inner tube portions defining an outer surface. The heat exchanger includes an outer u-shaped tube having first, second, and third outer tube portions defining an inner surface. The first, second, and third inner tube portions are disposed within the first, second, and third outer tube portions, respectively. An interior region is formed between the outer surface of the inner u-shaped tube and the inner surface of the outer u-shaped tube. The heat exchanger includes a mounting plate having first and second apertures. The first and second outer tube portions extend into the first and second apertures, respectively, and are coupled to the mounting plate. The interior region is adapted to be filled with a coolant.