Question about 2004 Chevrolet Express

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Water pump removal

I am trying to remove the water pump. I can not get the fan separated from the water pump. I rented a tool set from the auto supply store and so I have a wrench which will fit on the nut sytle shaft of the fan assembly. However the bub of the water pump turns too and so I can not get anything free. I asked a technician at a Chevrolet dealer and he said he uses a chisel and a hammer. Another one said the hub on the water pump should have bolts to allow me to hold the bub while using a wrench on the nut style shaft of the fan assembly. There are no bolts in the water pump hub - there are 4 holes. Is there a tool to hold the hub - if so what is it called and where can I get it?
Replacing the water pump should not be that difficult so I must be missing something. I have consulted the 2004 General Motors Truck Service Manual but I still can not find the answer. The manual refers to a J46406 (while the picture refers to a J41240) but this I assume to be the wrench to go on the nut/shaft.

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  • Anonymous Jan 05, 2009

    I have the same problem.

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Hi you usuraly can use a long screwdriver to use as a stop to get the big nut off.depending or the rotation of your motor will determin the rotation to remove the big nut.if fan rotates clock wise turn nut clockwise.if counterckockwise turn nut counterclockwise.

Posted on Jan 29, 2009

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this will help.thanks.

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