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Old 03-24-2017, 07:27 AM   #1
Rivet Master
Boom Sounds's Avatar
1991 25' Airstream 250
Oxford , Oxfordshire
Join Date: Jun 2007
Posts: 1,136
Images: 5
Water pump replacement

I want to replace my water pump on my 1991 250 Classic.

According to my VIN lookup on the AC Delco site, I have two options:

$117 ACDelco 251-612 GM Original Equipment Water Pump with Gasket
$50 ACDelco 252-608 Professional Water Pump with Housing

My sense is to get the cheaper professional water pump, given that it is 'professional' and seventy bucks cheaper.

Can anyone tell me if I am missing something here? Why is the better product so much cheaper?

I replaced my fan clutch about five years ago, should I bother replacing that as well? It seems to work fine. It was a AC Delco heavy duty one.

Thanks all for your help!

all the best

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Old 03-24-2017, 07:49 AM   #2
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1991 34' Excella
Princeton , New Jersey
Join Date: Aug 2003
Posts: 7,065
Images: 12
Adjectives are a cheap way to make up for shortcomings.

If there is that much difference in the price of 2 water pumps there is that much difference in the 2 pumps. The difference may be in the rated flow rate or just the quality of the pump. Buy the one with the higher flow rating.
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

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Old 03-26-2017, 01:27 PM   #3
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Kelseyville , California
Join Date: Feb 2017
Posts: 45
Wish I would have those price options for my 6cy Isuzu Diesel! Stock OEM water pump= $500.
1981 Airstream Excella 28' Turbo Diesel
Northern California
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