Quote: If the problem was at low speed I could see the a/c condenser and trans cooler being the problem but his trouble is at highway speeds which should rule that out.
That's an air flow issue thru the rad .Here's a test , pull that fan setup out of the car and go for a ride ...
I don't think that will help any... He might as well put cardboard over the grille
If thats the case why didn't he have an issue with the stock rad and that hi stall convertor ?
Stumpy spelled out the electric fan shroud being restrctive , SHE whose name can not be spoken had the same problem with her RR , alum rad , electric fan and a shroud that blocked flow , it idled fine but once you got it moving it would get way too hot because the shroud was forcing the hot air back into the radiator .
