My '03 LS6 ZO6 main cooling fan won't kick on and the engine overheats. The engine fan fuse constantly trips and gets hot - replaced. Other mechanic told me fuse box was bad - replaced - still tripping and no fan. Replaced fan - still no fan kick on. Do I need to trace the entire wiring and look for a short?? Anyone else have this?? Thanks for any input and help.
Most of the relays in the fuse box have the same part # so for a test you can swap the fan relays with others and see how that goes.
Of course if the battery is the side mounts it can be possible acid leaked down and soaked into the main wiring harness.
Look below battery and by wire loom and see if any white colored acid signs.
Isn't the fan control relay using a different sensor than the dash input? If so, a real time OBD-II scanner would let you know what it thinks the temperature is.
I could be wrong, I've been working on too many toys lately.
I swapped out the entire fuse box, replaced relay twice, no acid - only thing left is to start tracing wires. I was wondering same thing as Xford guy (why were you EVER a ford guy??? ;-) - if there was a separate sensor for that fan that could somehow be shorting out the fan and tripping the relay??? (Not much of an electrical guy ;-) Will start tracing wires tomorrow and let you know what I find - thanks a bunch guys I really appreciate it.
Update - traced wires directly from fan to fuse box: Only ONE WIRE goes to the relay listed as the primary engine cooling fan on the fuse box!!!! The other wire goes to a secondary relay not listed as the primary cooling fan - betting the secondary one is out thereby tripping the other. Hopefully the fix is replacing BOTH relays. Will let u know........
Thanks a bunch for the diagram! Still working on it with plenty of distractions and delays - will let you know how it turns out.
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