already checked & it wasn't the thermostat/blocked flap/bad hose. guys at the shop said the core has a small leak/heater valve isn't opening/closing. my friend/auto expert says he can fix it. he mentions just find out where the heater valve is located. don't worry about fixing the core. so....do i need to fix the core? where is the heater valve located? what are the prices? who's right here?
thanks folks