heater fan

1993 F250 IDI

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Sep 22, 2020
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Hoodsport, WA
Hello. First post here. Working on my 1993 F250 IDI, the heater fan has been growling occasionally for three years. I finally got around to addressing it. In the past, I waited for engine heat, then ran the fan on low for a bit to warm up the bearings in the fan motor/blower unit, then could turn it up without the noise after it warmed up. Before purchasing a new fan motor or motor/fan assembly, I removed the old unit, and found that both inner and outer bearings could be oiled, which (at least for now) cured the problem. Fan spins faster, without noise, and all seems fine. Time will tell.
 
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