list:

would add to this that an alternate test is to run a jumper wire from a
known good engine ground to the sensor housing, essentially the part you
put your wrench on, which should be grounded where it screws into the
thermostat housing, and see if gage reads properly. it is possible for the
thermostat housing itself, via bolt corrosion i suppose, to lose its
electrical bonding to ground. if there are several thousand ohms between
thermostat housing and ground, then ditto for sensor housing, and gage
will read cold irrespective of engine temperature.

dan

On Thu, 29 Nov 2007 09:53:55 -0700, Don Spence <dkspence@TELUS.NET> wrote:

>Jumping in late here and uninformed as to what was said previously
>but... with the ignition switch on, if you remove the wire that goes
>to the sensor and ground it the gauge should  swing over to HOT.
>Don't leave it there too long though. If the gauge doesn't move you
>have a gauge or wiring problem.  If it does I would suspect the
>sensor/sender.
>On 29-Nov-07, at 6:18 AM, Automatic digest processor wrote:
>
>> Subject: Re: Changed thermostat - temp gauge still reads stone cold
>>