I know the best way to find out is to just try to experiment myself but I'm curious about other people's experience.

I bought a 20" light bar that I'd planned to mount on the rear of my canopy but now I realize that it is way too big for that use. But it'll fit really easily onto my ARB front. My only concern is whether it will block too much air flow to the radiator. The truck stays cool, never goes above about 1/4 on the temp gauge, with a new radiator last year.

I'll be adding a winch too which will further block airflow.

I'm attaching two photos. The first showing without the light (though it is sitting on the hood) and the second with the light sitting roughly in place (it'd be mounted centered). Anyone ever had trouble with choking off air to their radiator?

 

I don't think it is a enough to worry about

 

You will be fine, plenty of air will still reach your radiator. I've seen setups that block a lot more than yours and they still run fine.

 

i have a 30'' on the front of my truck and it cools fine.

 

I have a problem with overheating ONLY when I'm driving 75-80 MPH and it's over 100 degrees. Only happened a couple times on I-10 between Tucson and Phoenix. It was 112 degrees! Had to pull over and cool off.

65 MPH and below, no problem. Look at my avatar and you'll see how much is in front of my rad. I doubt you will have a problem in your neck of the woods.