I have a 1989 F250 4wd with 460.
When the ambient temp is over 90 deg F, the truck runs warm, and the A/C barely cools at idle. Soon as I start moving, the temps come down. I'm running the stock fan, a new fan clutch, 180 deg. thermostat, and stock fan shroud. The radiator and A/C condenser are in good shape (fins not plugged or bent.) I was thinking of adding a "pusher" electric fan on front of the condenser, but my trans and oil coolers are in the way.

Any suggestions on how to move more air across the radiator / condenser at idle??

Thanks..

 

Your problem lies in the fan not turning enough when at idel. You may have a bad fan clutch, even though it is new, but the other problem might be in your radiator, you may have a few lines near the center of the radiator that are plugged inside, not allowing the heat to hit the center of the fan clutch, were the thermostat is located on the fan clutch. best thing to do is have the radiator rodded out. You will find that this should clear up your problem.

Dave

 

which is an 86 bronco with a 460 (did the swap myself) it overheated when I first started it up. To fix it, first I flushed the raidiator. You can get that stuff from the car parts store, but 1/2 gallon of Clorox works the same. Put it in and run untell it hits operating tempreture and then when the engine cools, drain it out, and depending on where you live,fill it up with water. Strait water dose a better job of absorbing heat than a mixture of water and anti-freeze. Thats no problem where I am in the south, where it won't freeze untell December (just remember to put the antifreeze back in in the fall, cause if the water freezes it will crack your block). Then I put a Aftermarket fan and a spacer on the water pump. The fan is larger and has 6 blade insted of the 5 that were on my stock fan, and using the spacer elimanates the clutch, so the fan always spins at the speed of the pump. The spacer is a universal one and I had to drill out the center hole to make it fit on the water pump. I also took out my A/C condenser, cause I never use the A/C and put a electric fan on the front where the condenser used to be. It worked so well that I don't even use the electic fan, and I suspect I could have left the Condensor in, except I think that A/C is for wimps Good luck, and don't let it overheat!