heater blowing luke warm air, blows strong just not hot on 1997 Chevrolet Camaro

heater blowes strong but no hot air. I hear the door opening and closing

by in Hayward, CA on January 22, 2014
2 answers
ANSWER by , January 22, 2014
Thermostat may need to be replaced. Heater core 'itself' may be restricted and needs flushing.
ANSWER by , January 23, 2014
CK COOLANT LEVEL 1ST BEFORE STARTING ANY REPAIRS. IF COOLANT IS LOW CK FOR LEAKS