Question about 2004 Mercury Grand Marquis
First check fuse 103 in the battery relay box and swap the blower relay with another similar relay, such as the horn relay. If this isn't the problem, you should hot wire the blower motor to the battery to make sure it works. If all of that is good, next check the switch/motor controller. Take the connector off the blower motor and check the voltage in the connector. With the key on, the voltage should be 12 volts with the fan setting on high. You can also use a 12 volt test light for this test. If there is no voltage, replace the switch/controller at the control panel. If you need any instructions or have any questions, please get back to me.
Posted on Nov 05, 2010
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Posted on Jan 02, 2017
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