bad heat on 2002 Pontiac Montana

heater blows cold air at idle warms as soon as i rev even couple hundred rpm

by in Canadian, OK on December 28, 2009
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1 answer 1 comment
ANSWER by , December 28, 2009
Check the coolant level, if it is low this will occur.
COMMENT by , December 29, 2009
thanks for the help but level is ok changed thermostat and bled system still the same