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I have a 1996 mazda b2300 which the heater hasnt been working properly since last winter. there are period of times the heater would get hot, warm, and then cold. i changed my thermostat about 3 weeks ago and still didn't work. i also noticed alot of rust in my radiator. so this friday 10/2/09 i took the truck to get a radiator flush and took about 8 gallons to get clean. after all this work the guy at the shop took it for a spin and the heater was still blowing cold. anybody ever had this problem before or could anyone give some advice on what it may be. thanks...