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i dontblock mine, i dont see the point to it. last year was the first time i drove my 96 in the cold it didint have any problems.
otherwise i drove my 82 for the years before that, the coldest day i can remember was -13 F, it started, warmed up and ran in normal temp range and put out plenty of heat.
maybe some vehicles are more cold blooded by nature and the old cardboard treatment helps
I have a grill cover for my truck, but since changing the heater core and installing a new thermostat I don't have any problems with heat in these Canadian winters. I also have a 2" aluminum rad.
I have a 96 f250 HD and Ive never done that, always thought about it, but even during the coldest winters a few years ago it started right up, i let it come up to temp while I cleaned off the exterior of snow, and then I hopped in and drove off, it didnt have any problems, it did stay noticable cooler but the heater still pumped out hot air so i wasnt too worried about it.
I've only done it once in a rain/sleet storm with very high winds... kept getting cool and my legs and feet were cold... just slid piece of cardboard from gas station under the grill and wedged it tight.... I would guess it was well below 0 with the wind chill.
I have a set of plastic "Lund" brand grill inserts. They simply pop into the openings in the 92-96 grill and block most of the airflow. I didn't use these inserts last year, and probably won't this year as it didn't seem to be necessary.
I block the rad in the winter time with a cover that has couple of flaps on it so that they can be left open and get a little bit of air flow. I find it helps the truck heat up much quicker in the mornings. It is atttched with snaps so if it is a warmer than usual day it is quick to remove and re-install.
I have also used cardboard in the past . Some of the service vans that I had would never really get warm. On mild days it would get wet and then would freeze to the rad over night . Not that it would hurt anything, I decided to spring for the cover .
My uncle made a trip up the Al-can In the early 80's. With an almost new 78 F250.The thermostat was stuck open and with rain coats and things like that stuck in front of the radiator they where still having to scrap ice from inside windows and wrap themselves in blankets. they finally found a shop that fixed it for them but they almost froze to death. He said it was like 30 below plus the chill factor. that's US temps.