[urq] Alternator Whine and Airflow Direction

[a2000sportster at aol.com]

Regarding the whine, man that's fantastic that a hopefully the source of the  noise might be the fan. Great idea to smooth the leading edges of the fan blades...six pack and a few hours and I wouldn't be able to see the blades ;^)
 
But the direction of the airflow would have to be from the front of the car to the rear! If the fan pushes the air out the front at speed it wouldn't be able to exit, because the fan would be pushing against whatever air speed the car had. And the car would overheat, but only at speed, idling it would come back down to normal temps....I had a leaking radiator replaced a number of years ago on a 200 20V, and the shop that did it couldn't find the problem of the overheating. Even though the front metal fender and hood got hot when sitting at idle, with the hood closed..because the fan was connected in reverse and could only push the air out the front when the car wasn't moving! I asked them why they couldn't drive it a couple of miles to see the problem, but their answer was if it happens in the shop we can fix it, it can't possibly be happening while you are driving it. Great Shop huh! My regular mechanic was on vacation, and it was at this new shop for over a week, idiling in their lot...limped to the regular shop. When he opened the hood he noticed the metal could hardly be touched it was so hot, looked at the connection to the fan, flipped the switch connection, problem solved!
 
Jack
 
Message: 5
Date: Mon, 6 Nov 2006 15:25:20 -0500
From: "Louis-Alain Richard" <laraa at sympatico.ca>
Subject: [urq] RE :  alternator whine - SOURCE determined!!
To: <brogers at terrix.com>,   <urq at audifans.com>, <quattro at audifans.com>
Message-ID: <BAYC1-PASMTP11894F3EB910EB072FDEC8CEF30 at CEZ.ICE>
Content-Type: text/plain;   charset="Windows-1252"

Technical question for all:

In ETKA, the tin-metal back cover (? la urQ and 200q20v) is called an
"intake cover". So, does the air enter from the back to be pulled
through the body towards the front and exhausted by the fan? If so, then
maybe the source of the noise is in the absence/presence of said cover ?

LAR 
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