Question about 2005 Mercury Grand Marquis

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2005, Grand marquis, aircondition works on max or regular AC setting, but fan only works on the highest setting, will not work on slower fan speeds

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This is a smiple repair, replace the blower motor resistor, this is what controls the lower speeds and is very common,the resistor is locate in the heater box next to the blower motor.

Posted on Jul 15, 2010

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Posted on Jan 02, 2017

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2 Answers

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Do not use the AC till you consult a local garage as i think the AC is leaking gas and this gas is dangerous to say the least .

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1 Answer

2000 grand marquis blower fan stops on lower speeds


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1 Answer

Ac or heat wont blow


Needs a blower motor resistor if the fan only blows on one speed. It is located underneath the firewall on the outside, near where the passenger exhaust system is. You need to take the passenger side cat converter off to get to it.

Jun 02, 2009 | 2003 Mercury Grand Marquis

2 Answers

2000 grand prix fan speed


i have been having that same exact problem with my 2002 grand prix for over a year now, and when my ac is on the lower setting the it doesnt work plus the headlights and lights on my dash go out. On Max everything works. i changed the blower resistor(about $35), still doesnt work. i changed all relays and fuses related to the ac, still doesnt work. i changed out the actual ac control switch in the dash, still doesnt work. i have changed everything but the blower motor and have asked every mechanic and auto parts retailer i come across and no one knows the answer. The best answer i got is that it is probably a wiring problem like a short somewhere.

May 28, 2009 | 2000 Pontiac Grand Prix

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