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Thread: '99 Grand Cherokee blowing rad fan fuse/overheating

  1. #1
    Join Date
    Nov 2008
    Posts
    2

    Question '99 Grand Cherokee blowing rad fan fuse/overheating

    I am using the Haynes 50025 for our 1999 GJC 4.0 to troubleshoot an inoperable fan/overheating problem. I found/replaced the hidden fan relay and installed an inline fuse holder between the relay and the radiator fan for extra measures. Afterwards it ran for a while however later on I noticed the fuse (20 amp) had blown and it began overheating again. I also noticed the wiring for the fan was frayed. It appears work had previously been done on the wiring because there are no "connectors" in sight and everything is hard wired and taped which leads me to believe there may have been some problems before. Do you have the color codes for the wiring so I can be sure of the +/- connections (from the relay to fan...uncertain of fan's make...wires are bk and bl/bk) and do you have any suggestions for me to better isolate the problem. Note: the fan still works when I jump off the battery.

  2. #2
    Join Date
    Jan 2007
    Posts
    4,850

    Default

    1999GC84RX7 - See if this link will help you. [***="https://mail.haynes.com/exchweb/bin/redir.asp?***=http://rigs.corequipment.com/cebby_WJsite/cooling.htm%23relay"]http://rigs.corequipment.com/cebby_WJsite/cooling.htm#relay[/***]

  3. #3
    Join Date
    Nov 2008
    Posts
    2

    Unhappy

    See if this link will help you.
    -------------------------------------------------------------------------
    I previously discovered/used this link to locate the relay however when talking about wiring it references the "connectors" which have been cut off from both the relay and the fan. What I'm in need of are schematics with color codes for the wiring. I read somewhere that the gray wire of the relay was positive and the blk was negative...is the green going to the fan pos and the blue/pink negative? Also, the fan has a blk and a blue/blk so I am assuming blue/blk is pos and the blk neg? How do I test the fan's setup +/- and do you know where I can locate schematics?

  4. #4
    Join Date
    Jan 2007
    Posts
    4,850

    Default

    contact our research department and they should be able to email you a wiring diagram. Contact them at [EMAIL="research@haynes.com"]research@haynes.com[/EMAIL] let them know you have been in touch with the message board admin.

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