Question about 1992 Cadillac DeVille

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My 1992 cadillac deville radiator fan comes on and blows the fuse, causing overheating

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  • raemonds Oct 06, 2010

    Thanks again Myki_r. I did replace the fan motor yesterday. However, once I did everything seemed to be working fine. But it popped another fuse later on in the night. Is there a short in the wiring harness?



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It is possible that the radiator fan bearings are dry and causing extra drag on the motor and blowing the fuse. Without the fan operating you will experience overheating. The bearings are usually a plain bronze bush type and the lubrication dries out eventually. You could try removing the fan assembly and carefully dismantling the motor. Once apart check for worn out brushes and if they are OK, then soak the bearings in engine oil and reassemble. The bearings are self aligning but once it is running after the motor has been put back together, give the motor body a light tap on the sides near the bearings to make sure the rotor is running free. If this all sounds too difficult, you may be able to get a replacement fan assembly from a salvage yard.

Posted on Oct 05, 2010

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  • raemonds Oct 05, 2010

    Thanks Guru. However once you said that, I had dismantled the motor and all looked in order. I reassembled and popped a new fuse in. That one also blew out. Can I wire the fuse ends together so if it pops, the current is still flowing for a really quick fix?

  • Mike Roberts Oct 06, 2010

    It appears that the rotor of the fan motor has developed an internal short circuit causing the motor to draw too much current and consequently keep blomay wing the fuse. Your suggestion of bridging the fuse will just burnout the wiring and even cause the insulation to catch fire. Thats why they put the fuse in the circuit in the first place, to protect the rest of the electrical system from failing.
    The only fix would be to replace the fan motor.
    Myki R

  • Mike Roberts Oct 07, 2010

    The reason that the fuse keeps blowing could be that another item on the same circuit as the radiator fan is drawing more current than normal and when the fan switches in there is a circuit overload which blows the fuse. Cars with air conditioning usually have two fans, which are normally switched on together. Maybe it is the other fan motor which is faulty and causing the overload. Check to see if the other fan (if fitted) is operating and disconnect it for a while to see if the fuse is still blowing. If fuse remains intact then repair/replace the other fan. If fuse continues to blow then there must be a short circuit between the fan supply wire and the body, some where in the wiring loom between the fan relay and the fan. Thoroughly check for any chafing of the wiring loom in the engine bay especially near the radiator area.
    Also check the labelling on the fuse box cover to see what other item is on that circuit and disconnect it if possible and then see if the fuse continues to blow. If fuse remains intact then repair/replace that item.



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