heater on 1992 Lexus SC300

over the last year my heater worked fine when first started,once i turned engine off and then back on it would only blow cold air.Over the last week all it does is blow cold air brrr,what could be wrong

by in Port Orchard, WA on November 06, 2010
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1 answer
ANSWER by , January 16, 2011
could be the heater control valve