Spitfire Thermostat

[zahid@serval.sps.mot.com (Zahid Ahsanullah)]

I have noticed that in winter my 1500 engine does not heat up
to operating temperature at all when I'm driving. At best it
goes halfway and stays there. Stationary, it does make it to
the correct temperature. The fix I figured was quite simply
a replacement of the thermostat but it didn't do nothing.
The car is behaving exactly as before and it isn't even that
cold down here in Austin Texas, mainly in the low 50's. So what's
the deal? anyone?

Zahid