Cooling Fan Surprise - Saab 9000 Bulletin Board - Saabnet.com
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Cooling Fan Surprise
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Posted by Peter Charak (more from Peter Charak) on Fri, 4 Jul 2008 19:16:10 Share Post by Email
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Our five 9000's are from 86 to 89. One is now a parts car, for which we are grateful. I've been working on them for some ten years, and on 900's and 99's since 1976.

Today I saw something that really surprised me. Before reinstalling the engine cooling fan after a headgasket/timing chain job (single speed fan, 87 turbo), I checked for operation, since this car is new to me. Imagine my surprise when I discovered that the airflow is towards the radiator! I had always assumed that cooler air would be pulled in through the front of the car, through the rad, and into the engine compartment. Not so. Hot air from the engine compartment, inches away from a turbocharger, is being rammed against the rad for cooling!

I checked our 86, and my wife's 89, and they're the same!

I don't think this was the case in the "old days", when the radiator was the only heat exchanger between the outside and inside, but I never checked. Does anyone know?

I guess Saab determined that attempting to pull cool outside air through the layers of A/C condenser, intercooler and radiator would provide less cooling than to push hot air onto a rad, usually while stopped, but occasionally while moving through the air in the opposite direction.

Anyway, just a surprise to me!

Peter

posted by 24.108.14...

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