Here is my situation, it's very cold out right now but it might get above freezing soon so I can do a little work on my pickup truck (
Chevy S10).
My 4WD went out (
push button selector not engaging system), I currently suspect the vacuum assisted components GM thoughtfully placed under the battery tray (
which can leak battery acid down there) but chasing that possible leak down can be complex I'm told.
Therefore as a temporary measure I added four more 70 lb bags of tube sand to the two I already had in the truck bed - that's nearly 500 lbs of sand plus the weight of fuel. I'm not going to get stuck easily.
As you can imagine
"the get up an go - went up and left" my truck, and I suspect the gas mileage is soon to follow.
I don't drive a lot but I can try to up my gas mileage with a partial grille bock.
Here is the truck.
As you can see the tow hook locations are sealed, and the radiator can get no air from underneath.
Question is, will an upper only grille block do squat?
I would be leaving the lower slit open.
Yes I have an electric fan installed, would not even consider this if it still had the old mechanical fan clutch.