no heat on 1998 Chevrolet Blazer

I have replaced heater core, I can hear water flow thru heater core when i give it gas, replaced radiator cap because i could remove it with no pressure on it but still no heat, radiator is full

by in Princeton, IN on December 14, 2010
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1 answer 1 comment
ANSWER by , December 14, 2010
maybe recheck for an air lock. i have the same truck and you may have to let it run for a very long time.
COMMENT by , December 15, 2010
thanks replaced thermastat and let it run for awhile fixed it.