heater not working on 2000 Dodge Ram 2500

i have a 2000 dodge 2500 5.9l gas heater plowes warm for 2 or 3 second on passinger side then turns cold , both hoses are hot thermistate is good ,what do i need to do? and what does the air condition pump going on and off got to do with the heater

by in Baytown, TX on February 04, 2011
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