Join Date: Aug 2019
Location: Northville Michigan
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I apologize in advance if the answer to my question is on another thread - I've searched but not found it.
So simply my 68' GTO runs very hot when there is no air moving through the radiator - but when I'm moving (like at all) the temp drops right back down to under 180 (160 thermostat). Like many, I am trying to figure out what best to do. I know the possible culprits - fan selection, shroud, water pump clearance, idle mixture, and other possibilities. With that said, I've decided that I first want to replace the radiator. This is a non-AC car, and I think the original radiator (that was replaced I'm sure with an exact duplicate) was not up sized for a/c obviously - and frankly it looks thin; I've not seen any numbers on it to identify it though. On top of that, it keeps springing occasional leaks, another reason to replace it! I think it may have some years on it. I run 50/50 with Water Wetter. Terrified of the idea of sitting in a bumper to bumper cruise!!!
If this doesn't work I'd like to add a pusher and keep the flex fan in place (and shroud) - I really would like to keep the vehicle looking "kinda" original, and it seems I could hide the pusher easily up front under the cowl. If that doesn't work, time to dig into the pump.
The engine was rebuilt a few years ago and runs fine, Doug's headers, and a Ram Air III cam, so it does have some umph....
My question is what radiator to replace it with? I've heard simply "4 core is best" but then I hear Cold Case wide tube while not 4 core transfers more heat - so I was just looking for recommendations. Also, with a new aluminum radiator, is it normal to paint it to make it look more stock? Will that reduce heat transfer?