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Bad blower (fan) in Astec RS-PSU-450-AC1N

NMB blower BL4447-04W-B49 Cannot locate exact part. Suffix B49 indicates speed sensing fan, all I can find is fixed speed. I could replace the ball bearings, but that is assuming I can find the small ball bearings NMB L-940ZZ.

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  • n1119 Nov 29, 2008

    That would keep thing cool all right, but I suspect if the power supply logic couldn't sense commanded speed changes, it would post an error on the status LED, which is what I'm trying to clear in the first place. Alpha ES-45s do that, for example, and you sometimes need to go through 3 or 4 fans to find one the logic likes. I don't know if the ASTEC supply is that smart, but I'd prefer the exact fan so I don't have to do it twice.

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If you cannot find a exact replacement, don't worry, use a fixed speed fan, you only want to keep things cool, you care what speed it runs at as long as it does its job, and it is easier than replacing the bearings

Posted on Nov 29, 2008

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C-19 Blower motor fuse 25A located in cabin fuse box. Left hand footwell on LHD vehicles, right hand dashboard on RHD vehicles.
Start by checking blower relay B-36 in the engine compartment fuse and relay box. Remove the relay. Jumper directly from battery to pins 85 and 86. (also see here: http://www.fixya.com/cars/r5544622-wire_relay if you dont know about relays) The relay should click Now measure across pins 30 and 87. Measurement should be 0 ohm.
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A/C Blower Motor Speed Control
The A/C blower motor speed control (19E624) is located under the A/C evaporator housing, to the left of the blower motor (18527).
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Blower Speed Override Thumbwheel
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