Yes have you ever power washed the radiator? Tested your antifreeze? Can you here the thermostat click on and off?

 

thermostat is a brand new cummins thermostat, radiator is a brand new cummins radiator, waterpump is also brand new and flows more than enough water, and it is an electric fan that blows twice as much air as the mechanical fan did. and it only happens on hot days so i know its not something like a thermostat because that would cause it to do that even on not so hot days

 

hey just a thought the radiator isnt below the top of the block is it? if the radiator is below the top of the block it might get air locked

 

like i said this is not a cooling issue this does not happen at all with the ac off or when its under about 98* or so. its not ever over heating i know my cooling system works fine. but under heavy load in 105-110* weather it runs alot hotter than i like to see. i would like to be able to run my chevy radiator not the piece of junk dodge one that isnt even half the size of the chevy one. but in order to do that, the intercooler needs to move. so im just trying to figure out what cons moving the intercooler will have, not trying to troubleshoot why its overheating i already know the cause of that

 

Is that a non-I/C downflow or an I/C crossflow rad? If it's the early downflow rad then that's your problem right there. Those things are crap.

 

thats not entirely true i perfer the down flow over the cross flow my down flow in my fummins conversion cools better than the crossflow that was in my dodge.

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i didnt put a/c in my fummins converiosn for that exact reason i would rather have a cooler motor and cooler egts then cooler cab but i live in north idaho also were it only gets over 90 for a few days in summer months

 

its the non intercooled radiator. the intercooled radiator wont fit in there its a hair bit too thick. but maybe i might have to go back to using it again

 

when my intercooler was blown i ran the turbo streight to the head for about 2 weeks it was cooler than no boost at all

 

im not going to go that route it needs an intercooler and with all the money and time i have into this thing the last thing im going to do is start hacking it up

 

What about relocating the AC condenser under the bed with an electric fan on it since you're only having problems when it's hot with the AC on. That way you wouldn't be creating turbo lag. Just a suggestion, IDK maybe it's a dumb idea