Originally Posted by jonward786
If you're getting hot on the highway it could be a sign you're thermostat is stuck open. I'd start there. Putting another fan in front of the radiator will not solve your getting hot at highway speeds problem. At high speeds, that airflow coming into the radiator should be more than adequate to cool. You only really need a fan while not moving or moving slowly. What you should do is properly utilize your puller fan. I'm guessing you are just hanging it from the radiator like ive seen a lot of people do around here. Treat your electric fan just like mechanical fan and use a shroud that covers the entire radiator. Here is what I use with my 68's radiator:
The champion 3 row rad I had came with a aluminum shroud but it seem to run cooler without it. I am guessing if I had more room to back the fan off the rad and shroud it then it would work better I don't have the space. The other option would be to mod the support and try to move the rad forward against the condenser but now we are talking cutting and fab'in some bracket.
Here it was with the shroud but with the fan inside which probably had a negative effect
Unless I move the rad forward I have 1/2 inch to the pump which I discovered is likely from a 70 or later as it is a driver side outlet. I dont know if those pumps stick out further but I can only get 2more inches at best.
I guess I have to hope bringing the condensor back helps.