I tried it with the heater on, and with it off. It was off first, the
needle came up a bit, opened the heater valve and BANG it was like I
had cut the wires to the gauge.

That said, I've had the car 14 years now and I can tell you that I have
never had this happen before, even with colder air.

Jim

On Jan 23, 2005, at 3:31 PM, jbange wrote:

> 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.
>