Sounds like your heater core may have a crack in its hose, the thermostat is located in what is called the coolant inlet pipe, follow the radiator hose that is on the upperside of the radiator until it reaches a little igloo shaped aluminum cap with two screws, its inside there, I hope I explained well enough.
Thanx for coming
joe
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Thursday, May 21st, 2009 AT 9:58 PM