Overheating in traffic

Tiny
68 GOAT
  • MEMBER
  • 1968 PONTIAC GTO
  • 7.4L
  • V8
  • RWD
  • AUTOMATIC
  • 20,000 MILES
I have the car listed above with a 455 aluminum two one inch flew radiator seven blade flex fan, transmission cooler 160 thermostat engine still runs hotter than it should. In traffic it runs 210 or better. Not good for alder engines.
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Thursday, April 6th, 2017 AT 7:38 AM

6 Replies

Tiny
CJ MEDEVAC
  • EXPERT
A few possibilities I can think of (others may jump in with more ideas)

No anti-collapse springs in the radiator hoses, sucking flat or close to it, tight bends

Radiator is not new/ maybe it needs professional flushing?

Is there a shroud for the fan?

This is just one of many products, have you tried any? Link below.

https://www.summitracing.com/parts/kys-530-4032?seid=srese1&cm_mmc=pla-google-_-shopping-_-srese1-_-keyser-manufacturing&gclid=Cj0KEQjwzpfHBRC1iIaL78Ol-eIBEiQAdZPVKsd_QNh-lcTJ6mhAdylZe_OptlnsKMZbU2ZI5IJwKlwaAp1F8P8HAQ

I reckon you have a fixed fan and are not using a fan clutch (fan clutch could be bad)

Here's another trick that may help.

See my last reply in this old post/ click on the pics and compare

https://www.2carpros.com/questions/1961-pontiac-other-1948-6-cl-getting-too-hot-215deg-just-blocks-driving

Your turn,

The Medic
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Thursday, April 6th, 2017 AT 7:35 PM
Tiny
68 GOAT
  • MEMBER
Radiator is less than a year old, new hoses with springs upper and lower, fixed 7 blade flex fan, Appropriate ratio of coolant. I do have a shroud. I haven't ever tried the 40 Below. I will try it and see what happens. Thanks again for you help.
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Thursday, April 6th, 2017 AT 9:40 PM
Tiny
HMAC300
  • EXPERT
Coolant should NEVER be more than a 50/50 mix as it eats aluminum up. What is compression ratio on engine? If higher like 11-1 will cause it to run hotter, 210 isn't to bad to run a 455 try a bottle of water wetter, or the stuff for cooler running at auto parts that works. You may want to invest in an electric water pump as well.
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+1
Friday, April 7th, 2017 AT 7:02 AM
Tiny
68 GOAT
  • MEMBER
Thanks for the info. I am trying a stuff call Purple Ice. Supposed to run 22 deg cooler.
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Friday, April 7th, 2017 AT 9:46 PM
Tiny
HMAC300
  • EXPERT
I've sued the coolant help stuff before and it works. Not necessarily that brand though.
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Saturday, April 8th, 2017 AT 6:46 AM
Tiny
CJ MEDEVAC
  • EXPERT
HMAC300, Took me a few seconds to figure out "sued" was spota be "used"!

I too have had good results with a different brand, called somethingoranother COOL or COOL somethingoranother, I couldn't find it online at the store I got it from a few years back.

The Medic
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Saturday, April 8th, 2017 AT 5:04 PM

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