If you had the hose replaced, check to see if it's tight. Also, mak sure the t-stat housing is tight.
The heater is another issue. The heater core may be plugged. One easy way to check is to locate the heater hoses under the hood. There is an inlet and outlet. With the engine running at operating temp and the heater on, feel both hoses. One should be VERY HOT and the other just slightly cooler. The hottest one is the inlet. The SLIGHTLY cooler one is the oitlet. If the outlet is cold or MUCH cooler than the inlet, it sounds like the core may be partially plugged and need replaced.
NOTE: THE HEATER HOSES HAVE THE POTENTIAL OF REACHING TEMPS. OF OVER 200 DEGREES. BE CAREFUL!
I hope this helps. If you have any other questions, let me know.
Thursday, October 23rd, 2008 AT 3:28 PM