70duster 360 gets hotter the faster i go

AJ/FormS said

Well good on Tyler. Those 3 inches add up to 15%. Get out the jigsaw. Do not pass go. Go straight to jail.What were you thinking?Whats the point of a 26 inch rad in a 22 inch core support? I could be mad if it wasnt at least a bit funny.You will joke about this for years.Now go push Tylers thank button.
As to cutting the core support; I think I cut the top and bottom, and then folded the metal over to 90* on mine. I thought it might force a bit more air through the core at speed.Kinda like a funnel.Since I never ran it as a 22, I cant say if it works or doesnt.But mine has shown no tendency to overheat.

So what about the lower hose?

Click to expand...

The 26" radiator works JUST FINE in front of a 22" opening. Mine does. Yes, you are losing some efficiency because some of the core isn't exposed directly to flowing air. But, it's still exposed to air. Which means that part of the core is still exchanging heat to the air around it. On the backside it's still exposed to all of the same air regardless. Water still circulates through that part of the core, all of that extra metal is still exposed to air, and the radiator still has a larger surface area. So, it still works quite a bit better than a 22" radiator.

Not only that, but the stock opening is 22 5/8". Splitting hairs? Absolutely. But so is tearing into someone for not cutting their 22" radiator support for their 26" radiator.

And of course, the car doesn't overheat all the time. Just at speed. So, is it really an airflow problem? It would overheat at idle if the radiator was insufficient. The fact that the temperature climbs when the cooling system is receiving the most airflow tells me it's not a radiator problem. You have a water circulation problem at higher RPM's. Since you can see through the core and the radiator flushes clean, I would suspect the water pump or a collapsing hose.

And you don't need a vacuum can for the street. Might be helpful, but if it were mandatory I couldn't have put 50k+ miles on my Challenger without one. And I'm definitely not the only one.