At 12:50 PM 1/23/2005, you wrote:
>About ten miles or more, depending on the temp. Today it's about 30,
>never got to operating temp in a 12 mile drive.
>
>I just replaced the thermostat about a month ago. I know it could be
>defective, but is there anything else I should be looking at?

Was the heater on? If you were running your heater, it's entirely possible
that your heater core alone was keeping the engine down to below operating
temp, what with it being fed with cold outside air.