I disagree with what Gary says here.  I believe that there is nothing wrong with your temp sensor
or thermostat.  I often use the front heater to dump some cold coolant into the systen when I find
the engine beginning to 'over heat'.  By dumping/adding the cool coolant into the system, the Temp
sensor will react to the TEMPORARY reduction in coolanat temperture and so indicate.  This is a
TEMPORARY situation as if one does not start driving in a way to cool things off, the coolant temp
will rise again.  I frequently use the cooler heater coolant on hot days when climbing a long
steep hill in 3rd, or when in very slow traffic. again its a TEMPORARY 'fix', but one that can be
used every 30 minutes or so (or when ever the heater coolant cools back down).  If I'm wrong, let
me know, I've been wrong before.  Malcolm

--- gary hradek <hradek@YAHOO.COM> wrote:

>    This suggest to me that your  is defective or you have something else acting as a
> thermostat.   When you bring the two heaters online you are effectively doubling your radiator
> size.  This should hold your coolant to the lowest temperature the thermostat will allow.
>       gary

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