too cool temps in the winter

[Brett Dikeman]

The 200q20v has a new thermostat from barely a few months ago, very  
recent main+aux radiators, and fresh pentosin coolant.

The thermostat was replaced because the car was often running cold;  
oil temps are close to normal, but coolant temps are often in the  
first 3 bars on a nearly constant basis in the wintertime.  Heat is  
also less than spectacular, although oddly enough, there's one turn  
close to the house (hard left, nearly a 180) where heat out of the  
vents seems to spike, as if there was a warm pocket of coolant...

Any ideas?  Do any listers partially block the grill/radiator to help  
keep coolant temps up in the winter?

Brett