I have a jeep liberty 2002 changed radiator heater core back flushed at jeep dealer heater works for a while really hot and sometime itj just starts blowing cold air suggestion jeep dealer said sceen keep getting clog

What does your radiator fill tank look like? When is the last time you changed radiator fluid? If you have an oil leak into the radiator, combination produces a jelly like substance that may be what blocks the screen. You may need a radiator flush and refill. What does your radiator fill tank look like? When is the last time you changed radiator fluid? If you have an oil leak into the radiator, combination produces a jelly like substance that may be what blocks the screen. You may need a radiator flush and refill.