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Heater blower fuse will blow if left on high.
1999 Mercury Cougar

Heater blower fuse will blow if left on high.

(1999 Mercury Cougar)
I have to run blower on level 2, so it will keep running. if I turn it up to 3 it will blow in about 20 minutes.
2 answers & 1 comment
Popular Answer
on March 22, 2011
sounds like the blower motor is drawing too much current. have it checked at a shop to verify.

Roy
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General Diagnosis
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on March 22, 2011
sounds like the blower motor is drawing too much current. have it checked at a shop to verify.

Roy
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on March 23, 2011
The reason a fuse blows is excessive current flow. When you select a lower speed on the blower, the speed change is accomplished by running the current through a resistor that resists the flow of current. On high speed full current is fed to the blower motor. The most likely cause is the bearing in the blower motor are wearing out which means it takes more electricity to make the blower move. Eventually the heat from the excess current flow blows the fuse. Caution: do not attempt to solve the issue with are larger capacity fuse, you might cause damage that costs a lot more than a blower motor.
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I changed blower, resitor, and relays It still does the same.

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