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I don't find them necessary and I live farther north. Temp stays at 196 to 201 even at 75mph in -40. Never seen the need with this truck. Once it gets up to operating temp, it stays there.
Don't have and issue with it at that speed either just takes forever for the temp to get there.
Idle for two minutes and the engine temp plummets like a rock in sub zero weather.
I want the engine temp to rise faster than taking 15 to 20 mi to get the needle to move....and last longer at idle.
If the thermostat is closed why should a cold front make a difference? Do you believe that there is enough air circulation that convection actually cools the block? I don't use one but mine always is blowing warm air within 5 km no matter what the ambient is.
I just installed an FIA winter cover, sorry no pics yet. Looks like a good product but I did have to stick the backers on my grill. Doesn't look too bad though. Cover is not needed if you have a long enough commute to work. I only live 5 miles from work, so it helps get the engine to operating temp much sooner. I hate shutting it down in the winter without getting it to temp.
I have heard of some placing a sheet of cardboard between the primary and secondary radiators to help similar conditions/complaints.
I was looking at that yesterday when changing the oil.
I have some left over rubber faced belting strips that I can cut to length and drop down in between the primary and secondary radiator. This way I can pull or add strips to get the right balance without adding something to the grille.
The sheet of cardboard is an old school trick. Don't know if it is as effective as it used to be with modern thermostats and temp. sensors to engage/disengage the fan.
Back in the early 80's in the territories where ultra cold is normal, the rental trucks had canvas wired to the front of the grill and wrapped underneath the engine tied back just past the transmission. Haven't seen that done in my recent tour of the NWT.
This morning I blocked about half the radiator with a sheet of cardboard. Outside temps were around single digits.
With no idle time, get in and go, engine was at temp in half the distance and time as normal. I don't have the supplemental heater either. No issues with overheating either.
I'm sold now, just have to fab something a bit more robust.
My experience in the northern states......Montana...Vermont....New Hampshire....Maine:
Covering at least part of the front open area makes a BIG difference in cabin heat (due to engine heating up faster and hotter) and is better for the engine since the oil stays cleaner when it is hot and the engine runs more efficiently.
I used corrugated plastic. Just like cardboard, but more weather resistant. Two small rectangular cuts to tuck it in where the chrome 'C' studs are behind the grill and it hardly moves. This is the third winter for it, regularly pressure wash etc just like normal. Being a few inches off the rad I never had any issues towing on the highway. I found temperature issues driving around town, especially idling - and this helped big time. Often kicked my MiniMaxx out of hot frequently due to coolant temp, and then warm back up, cool off ... audible chirps every time lol.
Blue pops and kind of looks cool when its clean, sorry for the poor pic. I bought a 2'x4' piece at the hardware store for a few bucks. Black, clear, red, white are also common colours.