Your t-stat is in bachwards or (more likely) the heater core needs to be flushed out. It is common for a heater core to become clogged with junk.
To check the heater core for blockage-get the engine up to temperature. Feel the heater cores two hoses--located in the engine compartment. If the core is NOT blocked the two hoses will be the same temperature--if it is blocked one hose will have a temperature difference.
Monday, March 3rd, 2008 AT 4:11 AM