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Runs hot when slow or stopped

Tiny
JAYSONA
  • MEMBER
  • 1965 DODGE CORONET
  • 5.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 1,000,000 MILES
I have replaced the 273ci engine with a newer larger 340ci. Both have had the same problem problem with heat at slow speed. I have replaced every part of the cooling system. I have a new aluminum radiator, water pump, hoses and belts. 180° thermostat. I also tried a 190°. I currently removed the mechanical fan and put an electric fan/shroud pulling. I tried it pushing as well along with the mechanical fan. I am wondering if using a fan clutch would be any better. My question is how does a fan clutch help? It seems like stopping the fan would make it worse.
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Saturday, July 7th, 2018 AT 1:45 PM

1 Reply

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I am Danny.

Basically, a fan clutch (mechanical-viscous type) are controlled by fan speed and engine rpm's to help aid cooling at lower speed usually forty five mph and slower. That is to help for low speed and idling. I would say the electric fans would provide better cooling. You want them to be wired to pull airflow through the radiator (toward engine) if mounted on inside of engine compartment. Hope this helps and feel free to ask any questions if needed. Thanks for using 2CarPros. Com. Danny-
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Sunday, July 8th, 2018 AT 12:05 PM

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