High speed cooling fan relay 50 amp maxi fuse keeps blowing

Asked by Nov 12, 2014 at 12:35 AM about the 1999 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

The fuse will last any where from a month
to a couple days then I'll notice my engine
will start running hot and I'll check the fuse
and it will be blown my radiator fan runs
fine it turns freely with the car off

1 Answer

113,935

Intermittent short in the cooling fan circuit, bad fan relay possible burn't points internally, bad fan motor possible bad brushes or a flying short when running. As the relays and fan motors do fail with some regularity I would replace them both at the same time unless you want to spend the bucks and have a tech check it out.

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