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Old 07-22-2016, 10:56 AM   #1
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Cooling the hemi

I've noticed as horsepower has increased so has the water temperature. Using a 180 thermostat and a new 05 radiator. This is not unexpected, but was wondering what radiator setup is being used by the high output guys. Is there a bolt in replacement or is a custom built radiator needed? The temperature use to be 188 cruising on the highway and in town with stop and go stuck in traffic I could see 203 when the fan comes on and pulls it back to 194. Now I see temperature creep with most any load on the engine even at cruising speeds. So what's the cool setup?

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Old 07-22-2016, 11:13 AM   #2
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Do you run an extra capacity - oversize oil cooler too?
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Old 07-22-2016, 11:33 AM   #3
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Quote:
Originally Posted by HemiFun05 View Post
Do you run an extra capacity - oversize oil cooler too?
If you are talking about engine oil cooler, no. The only addition to the front is the intercooler radiator. The stock radiator, then trans cooler and finally the intercooler radiator. It's a pretty busy area.
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Old 07-22-2016, 11:44 AM   #4
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Yep no doubt space is at a premium with your set-up . You may have to go the custom-built route with an extra thick core cross flow radiator if space permits .
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Old 07-22-2016, 12:18 PM   #5
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I use a fan behind the intercooler heat exchanger. It also blows air on the trans cooler. Along with a Black Magic (300cfm) electric fan, 180 thermostat, doesn't go above 185 degrees even on a hot day.

NOTE: Drilled the vent hole a little bigger at the top of the thermostat. The hole will also vent air out of the engine when refilling the cooling system. You know how it's a pain to get all the air out of the engine cooling system with the stock thermostat....

That reminds me, have to get a better radiator overflow tank.
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Old 07-22-2016, 12:33 PM   #6
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Stu, what radiator are you using? Maybe all I need is a fan on the front of the stack of radiators blowing more air??
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Old 07-22-2016, 12:47 PM   #7
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Advanced Auto 05 Hemi Ram radiator. You just probably need a fan Greg.
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Old 07-22-2016, 01:25 PM   #8
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Mine sometimes will run warmer than normal. Wondering if it's something with my radiator. It's the stock one with 113,250 miles on it so wondering if I should try changing it out. Like I said sometimes it will just run warmer than I'm comfortable with but not always
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Old 07-22-2016, 02:15 PM   #9
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It'd be cheaper to try a fan then pop for custom radiator. They run around a $1000... ugh
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Old 07-22-2016, 03:39 PM   #10
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Fwiw the radiator in my '11 is giant compared to what the '06 had. I have the optional larger one, I forget exactly what they called it on the window sticker, I'll check later. The radiator and a/c aren't side by side in the '11

EDIT: There is no optional larger radiator. It's standard as "heavy duty engine cooling". The 4th gens use a different radiator for 2500 trucks where the 3rd gens used the same radiator for both half and ton. Learned something new today
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