when i checked the heater core hoses i was in the garage so the bottom hose felt warm.but after i got back from work i decided to check them again and noticed that the bottom one was cooler than the top and thats when i was outside,not warm or cold but in beetwen.so you think its the heater core and not the heat nsensor,if its the heater core I checked for the price on one and its about 48 bucks.thanks again