Oops! Darn return key! Here's some info to peruse... - Saab 900 Bulletin Board - Saabnet.com
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Oops! Darn return key! Here's some info to peruse...
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Posted by Micah in NC [Email] (more from Micah in NC) on Thu, 28 Feb 2002 17:55:19 Share Post by Email
In Reply to: Ventilation fan electrical issue, Bill Elliott, Thu, 28 Feb 2002 16:05:58
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Bill,
I think you're right about the resistor pack. I've read somewhere that when it goes bad, the sudden full current draw of HI fan speed places enough current load on the system to blow the fan fuse, especially if the fan is aging. (Is your fan motor as old as the car?)

There's a link below to Townsend Imports' site about heater fan removal.

Here's an excerpt from that page...

"The resistor block for the speed control lives under the left front speaker, in the air box to the right of the opening, close to the firewall. It has a single connector with 5 wires on 4 pins with a black rubber hose attached to it for cooling. Leaving this hose disconnected either from the resistor pack or from the fan can cause the bimetal overheat protection strip in the resistor to trip and blow the fan fuse. There was an update for early resistor packs to solve a weakness in the overheat strip.

"The resistor just snaps into the ducting, but is a bit hard to remove and replace due to the tightness of the quarters. Remove the resistor pack and check from its pin 5 across each of the pins 2-4 for continuity, the farther from 5 you go back,the higher the resistance should be. Inspect the contacts on the switch for the overheat protection. If you see arc marks on it, it has been activated. This could be from a weakness in the strip (replace the resistor), a missing or kinked cooling hose from the resistor to the fan, or excessive current draw from the fan."(courtesy Townsend Imports' site)

Hope this helps!

Micah in NC
'84 900S, 203K mi.


posted by 208.25.24...

Click here to link to the Townsend Imports' fan page.

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