"Clete" <lecllaij@halifax.ca> wrote in message
news:3ik3f59dersk7089c7l0jg95lig1ig22pk@4ax.com...
> On Wed, 04 Nov 2009 10:32:29 -0800, Gene Wagenbreth <genewxxx@isi-OS4>
> wrote:
>
>>I have a 1990 Honda Accord. It usually runs with the temperature
>>guage in the middle range. Frequently the guage will quicky go up
>>to close to, but not at the high end red mark. This happens even
>>when its 50 degrees out and I am going 45 mph. If I turn on the
>>heater the temperature usually goes back to middle. It goes down
>>very quicky, within 10 seconds of turning on the heater. I dont
>>believe the heater could cool things off that quickly.
>>
>>I have a new radiator and antifreeze. I am not loosing coolant.
>>
>>Could it be a hose or chamber that is blocked/pinched, and turning
>>on the heater is allowing the coolant to byupass the blockage ?
>>
>>Any helpful comments appreciated.
>
> Head Gasket ?


I'm thinking thermostat.