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  #1  
Old January 22nd, 2011, 03:22 PM
ajh
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Andrew J. Hutton
1993 Defender 110 200TDI
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heater fan testing

My heater fan appears to have died but I need to confirm this 100% before going after a warranty replacement. What is the best way to do this?

If I short at the switch to ground nothing happens, I am not 100% on how the rest works and have limited spare fuses with me, but given I am driving every day the lack of heat is getting annoying.
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  #2  
Old January 22nd, 2011, 04:13 PM
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Nick Vogel
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A defender warranty? Wow!
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  #3  
Old January 22nd, 2011, 11:42 PM
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John B.
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Stick something in through the intake and make sure it turns freely. They get easily jambed with dirt or ice.
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  #4  
Old January 23rd, 2011, 12:26 AM
ajh
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Andrew J. Hutton
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I'll see if I can get to it tomorrow, I do run a snow guard though and I have been in New Mexico for a week now so probably not ice.
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  #5  
Old January 23rd, 2011, 12:51 PM
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Michael White
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You should be able to turn the fan by hand (with the power off, of course) by sticking your hand into the air inlet. If not, try soaking the fan area the best you can with some sort of break-free type spray (e.g. WD-40). If it still doesn't move, say "Hello" to cold legs

If the does move, you can try shorting the switch connectors to ground. This is fairly high current, so use some jumper wires; don't short it by hand. If the fan spins, you may have a bad switch or a bad ground wire on the switch.
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  #6  
Old January 24th, 2011, 05:58 PM
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Jake K.
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Have you scanned the fuses yet? Check for the fuse(30 amp) piggy-backed on top of the heater box itself under hood. Why that fuse loves to blow after it's been sitting and we get a cold spell I don't know...but they do!
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Old January 24th, 2011, 09:03 PM
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Neil McCauley
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Just unplug the connecter to the fan motor (its on the top left corner on a 94 D90 and its black). I just disconnected mine when I took out the box for the new heater core last weekend. Then to test, stick some - & + wires into the connectors and see if it spins. Then you'll know for sure if it works.
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