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agreif
Joined: 31 Jul 2000
Posts: 880
Location: Chicago Burbs 2001 Silverado RCLB 6.0L - Andrew
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 Disconnecting AC lead on FAL controller
Is there any disadvantage to disconnecting the AC wire on the FAL controller. This will just make the fans go on at temperature instead of when the AC is on...which is the way the clutch fan worked as well. I just know the only time I turn on the AC is when I'm going down the highway with the wife, and I really don't need the draw of the fans at that speed. Am I missing anything?
Andrew
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| Mon Jul 25, 2005 12:27 pm |
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Speeder
Joined: 30 Apr 1999
Posts: 9719
Location: 2000 Silverado Z71 4.9L 4L80E, 2003 Lincoln LS 3.9L V8 5 speed auto
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Yes
The fans need to be on when the truck is at idle, and they won't necessarily be running unless the truck is running hot. If the fans aren't running the AC won't be cooling at all at a stop. A better way to go would be to use the overdrive circuit to drive a relay that would open the AC control line, shutting the fans off anytime the truck is in overdrive. By shutting them off this way the fans will still come on if the truck is overheating, but if the truck needs fans at highway speeds you have other problems to deal with. This is something I wanted to do with the Tahoe, but not enough to actually crack manuals. Yet.
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| Mon Jul 25, 2005 12:47 pm |
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James B.
Moderator
Joined: 03 Apr 1997
Posts: 2634
Location: '98GMT400, '98GMT410, 99GMT420
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Do not run the Air Conditioner without airflow over the condensor. Temperature and pressure on the high side will increase to a point where compressor damage or hose blowout becomes a very real threat.
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| Mon Jul 25, 2005 1:29 pm |
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agreif
Joined: 31 Jul 2000
Posts: 880
Location: Chicago Burbs 2001 Silverado RCLB 6.0L - Andrew
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OK, so this really becomes a problem if I am not moving at highway speeds and have air over it. Sounds like Jim's idea would be the way to go if I could figure that out.
Thanks you two,
Andrew
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| Mon Jul 25, 2005 4:55 pm |
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agreif
Joined: 31 Jul 2000
Posts: 880
Location: Chicago Burbs 2001 Silverado RCLB 6.0L - Andrew
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hey, how does the stock fan work in this case, I thought that it didnt turn on till it reached temperature either? Or is it still slightly spinning even thought the clutch isn't engaged?
Andrew
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| Tue Jul 26, 2005 3:31 am |
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Speeder
Joined: 30 Apr 1999
Posts: 9719
Location: 2000 Silverado Z71 4.9L 4L80E, 2003 Lincoln LS 3.9L V8 5 speed auto
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Stock fan is always turning
agreif wrote:hey, how does the stock fan work in this case, I thought that it didnt turn on till it reached temperature either? Or is it still slightly spinning even thought the clutch isn't engaged?
Andrew
Even when the clutch isn't engaged. It is just spinning at a slower speed than it might. When the air off the radiator heats up enough, the spring in the center of the stock clutch will tighten (or expand, really doesn't matter) with will cause the clutch to engage. You can tell this is happening when it suddenly sounds like an airplane under the hood. When this happens the fan is spinning at the same speed as the engine. So, the stock clutch is providing some airflow regardless.
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| Tue Jul 26, 2005 5:12 am |
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ac
Joined: 04 Mar 1998
Posts: 165
Location: Tampa, FL 1954 to 1992, Cartersville, GA 1992 to Present.
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OD Circuit.
Has anyone did the OD circuit? If so how about some info.
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| Tue Jul 26, 2005 1:13 pm |
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