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Engine overheats at idle or stop and go

Tiny
W94831254
  • MEMBER
  • 1962 CHEVROLET IMPALA
  • 6.7L
  • V8
  • RWD
  • AUTOMATIC
  • 70,000 MILES
My car overheats only when stopped or a lot of slow stop and go traffic.
Monday, August 21st, 2017 AT 4:29 AM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Does the engine have a fan shroud? Can you send me a picture of the fan set up?

Cheers, Ken
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Monday, August 21st, 2017 AT 6:05 PM
Tiny
W94831254
  • MEMBER
  • 5 POSTS
Yes it has a fan shroud. Aluminum radiator, five blade fan, with a thermal fan clutch. Fan Is four inches from radiator, and is out side the shroud 1/2".

Additionally, I had a 160' thermostat and resently changed it to a 195'.
Engine Is a 409ci with 475hp, bored.030 and a bigger cam. Aluminum heads, 2-4s.

Car hold temperature fine traveling down the road it is the long idling time that it heats up. Mainly at stop lights in a row and traffic.
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Tuesday, August 22nd, 2017 AT 5:10 AM
Tiny
W94831254
  • MEMBER
  • 5 POSTS
I purchased the car one year ago, guy I purchased it from did built and installed to 409 engine in 2012. He was very meticulous and did not cut corners that I can see. He did not drive the car much, so there is less than 1,000 miles on it.
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Tuesday, August 22nd, 2017 AT 5:14 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
It looks clean. When the car is heating up can you hear the clutch fan engage? It will roar when it starts to lock up. If not I would get a new fan clutch (GM) from rock auto and install it.

It is a fan problem or it would overheat when driving.

Please let us know what happens.

Cheers, Ken
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Tuesday, August 22nd, 2017 AT 10:59 AM
Tiny
W94831254
  • MEMBER
  • 5 POSTS
Okay thank you. I will try that soon.
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Tuesday, August 22nd, 2017 AT 11:21 AM
Tiny
W94831254
  • MEMBER
  • 5 POSTS
Clutch fan is not very old or used much. They go bad that fast or from lack of use?
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Tuesday, August 22nd, 2017 AT 11:22 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
They can be just off, get a GM or ac delco from rock auto should do the trick.
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Tuesday, August 22nd, 2017 AT 10:39 PM

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