Vintage Oldsmobiles Curved Dash, Limited Touring, Models 40, 53, 66; Series 60, 70, 90

Water pump difference AC vs non AC

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Old Nov 4, 2025 | 04:58 AM
  #1  
Mike16's Avatar
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Water pump difference AC vs non AC

Can anybody state the difference between a standard waterpump and an AC waterpump on the early v8's


Thank you

Last edited by Mike16; Nov 4, 2025 at 07:02 AM.
Old Nov 4, 2025 | 05:36 AM
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From: Upstate NY
I have a 55' with AC, on the 324, the bearing is different from the non-AC, more robust. As far as the impeller, mine originally had an aftermarket water pump with 8 vanes but the rebuilt OEM i received from Fusick has 6, although on ebay i've seen a mix of both 6 and 8 vane impellers on OEM water pumps for AC cars. I would imagine they beefed up the bearing due to the 6-blade radiator fan and dual belt pulleys, it moves a lot more air than the standard 4 blade, plus the ac cars have a shroud to help direct air into the radiator/condensor.
Old Nov 4, 2025 | 06:43 AM
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Originally Posted by Mike16
Can anybody state the difference between a standard waterpump and an AC waterpump.

Thank you
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Old Nov 4, 2025 | 07:00 AM
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Mike16's Avatar
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Originally Posted by Texas442
thank you.

I was referring to the difference between ac and standard pumps on the 49 to 62 early v8's.
Old Nov 4, 2025 | 09:39 AM
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Actually , the Non A.C. Water Pump fits 1949 - 1962….
The A.C. Water Pump fits 1953 - 1962 , as Olds didn’t have Air Conditioning until 1953….

I have both of them *** Brand New *** , but I would have to open
( frail “ rebuilt “ boxes ) to compare them side - by - side…..
Old Nov 5, 2025 | 10:26 AM
  #6  
Mike16's Avatar
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Originally Posted by mpolds
Actually , the Non A.C. Water Pump fits 1949 - 1962….
The A.C. Water Pump fits 1953 - 1962 , as Olds didn’t have Air Conditioning until 1953….

I have both of them *** Brand New *** , but I would have to open
( frail “ rebuilt “ boxes ) to compare them side - by - side…..
I'm curious about the rebuild kits used in the AC vs the non AC pumps. And what are any other differences that may exist in regards to dimensions.

Am I understanding correctly that ac pumps will not fit the 49 to 52 engines?

Can I use an ac Pump on my non ac car? Its a non ac 55.

Anybody ever compare the rebuild kits ac vs non ac?

is anybody aware of a part number for an ac pump rebuild kit and also a part number for an non ac waterpump?

Last edited by Mike16; Nov 5, 2025 at 10:34 AM.
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