AC fan only works at high setting

Asked by May 21, 2014 at 03:53 PM about the 2004 Mercury Grand Marquis LS Ultimate

Question type: Maintenance & Repair

2 Answers

380

Needs a blower resistor up under dash somewhere you replace that and you should be all set

2 of 2 people found this helpful.
25,595

The resistor block is under the hood in the Firewall directly behind a heater hose. You'll likely need to replace the Blower Motor (and fan) as well. Hope your Fan Speed Switch isn't burned up too.

2 of 2 people found this helpful.

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