You might want to check a marine store. The boat I used to have had a cabin heater which ran off the closed cooling system (coolant). It looked like a small radiator with 2 side by side electric fans. Each fan had it's own toggle on the dash.
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03 Tahoe
72 GMC Super Custom 2500 Custom Camper, my reliable workhorse. Dual gauged tanks, dual battery trays.
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