Welcome to Canada!!!

[xl_target]

In my Dakota, it never quite warms up when the temps get below freezing. Of course the gas mileage sucks in the winter.
Its also got a engine mounted fan so revving the engine just blows more cool air into the engine compartment. Blocking the radiator might help but I've only got a 12 mile drive to work and it would barely warm up in that time anyway.
The engine is a 3.9 L V6 made by chopping two cylinders off a 318 V8. So your theory holds water, literally

On my Intrepid, which has a 3.0 L V6 (Mitsubishi engine), it is warm no matter what the temperature is outside.
It is now my winter beater. The electric cooling fans hardly ever turn on in the winter.

My wifes Dodge Neon is a 2.4 L four cylinder and is very warm. It will cook you out. You actually have to turn the heat down and let some outside air in.
It also has auto start so you can start it fifteen minutes before you go out and you have a nice warm car to get into.

I don't know about my Crown Vic cop car (4.6L V8) because I have never had it out in the winter.

[timmy]

This certainly sounds like you qualify, XL!

I found the trick was to cut enough of a hole in the cardboard so that a little air could go through the radiator. Only a small area, a little bigger than a paperback book was necessary to keep my truck from overheating if I was driving about town or down the highway. Sometime in the spring, I could tell that outside temperatures were high enough to cause things to run a bit hot, so I would pull the cardboard out at that time.