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'69 Cooling System Confusion

 
Old 08-10-2001, 03:55 PM
  #21  
Corvettes White
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Default Re: '69 Cooling System Confusion (ddecart)

tonight when i get home.

George
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Old 08-10-2001, 06:50 PM
  #22  
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Default Re: '69 Cooling System Confusion (ddecart)

Dave,

Your VIN fits in between two cars Bizzoco lists. VIN 10972 and 18110. Those cars are listed as the following:

10972: A/C, copper rad, no surge tank, smooth hood, plastic shroud, 5 blad fan

18110: no A/C, copper rad, no surge tank, plastic shroud, 3 pin hood w/blanket, 5 blade fan

Shannon
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Old 08-10-2001, 07:02 PM
  #23  
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Default '69 Cooling System Confusion

Shannon,

Remember that Dave's car does not have A/C so the #10,972 car is not going to help us answer the question...

What is the last L-46 car prior to Dave's without air conditioning... That early in 1969 prodution, I'm betting it has an aluminum radiator.

Regards

Stan Falenski
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Old 08-10-2001, 10:47 PM
  #24  
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Default Re: '69 Cooling System Confusion (Rowdy Rat)

In the survey data Bizzoco published, only one very early L46 car had an aluminum radiator. VIN 1363 is a non-A/C car with aluminum radiator. The next L46 has a build date E06, no VIN listed, and has the copper radiator. That's followed by the 18110 car.

Shannon
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Old 08-11-2001, 02:05 AM
  #25  
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Default Re: '69 Cooling System Confusion (ddecart)

Well, I can add a little bit to the survey in Bizocco's book. It so happens that I have a friend who is the original owner of his 1969 L-46. His car is serial number 7234. His car, which is non-A/C, was originally equipped with the aluminum radiator and external supply tank.
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Old 11-08-2014, 10:11 PM
  #26  
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Default

Originally Posted by Joe Lucia View Post
"ddcart"-------

1969 L-46s were originally produced with 2 different radiator systems. There's really no way to tell, for sure, which way your car was produced but either system would generally be considered "correct". However, a "mix-and-match" system is NOT correct. Here's the details of the two systems which I'll call "A" and "B":

System A:

1) aluminum GM #3155316 radiator; GM-discontinued but available in reproduction

2) radiator mounts to support with two rubber cushions on the bottom which fit into "cup" brackets welded to the radiator support. Top support is provided by single, central bracket and rubber cushion; bracket is attached to center of support with 5/16" bolts. Support, last available under GM #3966591 is GM-discontinued but available in reproduction;

3) external, aluminum supply tank, GM #3016340, is mounted on right side inner fender well

4) Steel, "cylindrical" fan shroud is used with steel lower baffle plate. This shroud, GM #3938943, is long-since GM discontinued and is not reproduced, as far as I know;

System B:

1) copper brass radiator of GM #3018803; core is 26" wide; GM discontinued

2) radiator mounts to support with upper and lower u-shaped brackets on both sides with attached rubber cushions; this method of attachment is similar to big block radiator mounting but the right side u-shaped brackets are different; radiator support, last available under GM #3966594, is discontinued but available in reproduction

3) radiator shroud is plastic shroud of linear polypropylene construction with graphite and fiber reinforcements. This shroud is GM #3956109 and is still available from GM;

4) NO external supply tank was used with this radiator; radiator has an integral filler cap and tanks.

That's the story.
Really good info. Where is the radiator support number marked. I have an L46/manual/no A/C and I want to restore that to the correct cooling system configuration. There was a 26" copper radiator and no expansion tank. I want to get the correct radiator support and shroud.
thanks
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