In the southwest- when overheating becomes an issue, removing the fan actually helps. 95% of the hummer community understands it because of the insane angle our radiators are at.
What happens is in slow traffic or at a stop light & the main fan isnot on yet- the electric fan helps. When traveling above the speed of air the fan can produce or whenever the manual fan is on… the electric fan becomes an impedance to flow.
Imagine it this way: if fan produces 40 mph wind and moves 7,000 cfm- that is all it handles, right? So when the fan is subjected to 50 mph going down the hiway, that fan would have to overspeed to allow the faster air travel. Or if the huge mechanical fan is moving 18,000 cfm and the area which the fan is in can only handle 7,000- most the air has to go around the fan to where nothing is restricting air flow.
So if you have an issue where overheating (wether engine or hvac) at stoplights is the problem, electric fans can help. If you have issues at higher speeds, the electric fan hurts.
Its an unusual situation for most of the country, I understand. But in the southwest we have the highest heat combined with lowest humidity. And the low humidity greatly lowers the efficiency of the radiator. Wanna see how much humidity helps- on a hot day idle your rig at home and measure the air from your ac. Now take a water bottle and mist the condenser & watch how cold it gets.
There is tons of things folks from super cold areas learn that here we just wouldn’t have a clue to. But if ya look up Vegas as the driest city in the country- we learn these things mighty fast.
So if that truck spent anytime around here- the fan gets yanked. When I would do it for folks I would tell them keep it for if they move or sell the truck. But the majority just throw it away.
