Question about 2003 Mercury Grand Marquis

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Ac fan only works at very low speed. Can the fan resister be the problem

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You should have two small relays for the fans, one for high, one for low. Try swapping with something less important.

Posted on Sep 02, 2010

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Ac/heater will only work on low when you move it to med or high it shuts off


need to check switch,resistor and fan ---ur switch might have resistor built in it would need to be tested for continuity for the other speeds --if your truck [didnt specify which ] has a separate resistor it should be attached to the heater fan motor housing again resistor needs to be tested -also test ur fan for any resistance or overheating

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2003 grand marquis gs blower switch is a 4 speed. the first two LOW, and next position are not working. Is the switch module or the fan motor in the engine compartment?


There are resisters that controle the fan speed located in the plenum (its the air movement that cools them). They can be checked and changed out simply by opening the hood and locating the AC evaporatot housing on the firewall (passengers side).

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1 Answer

01- Dodge Caravan AC Heater Control it only works on high none of the speeds work when I rotate the switch from low to high. Is this a swith problem or a motor problem?


Most likely neither. The most common cause is that an electrical device called the blower motor resister block, has failed. This device provides all the slower speeds. It is generally mounted in the HVAC [Heating, Ventilation & Air Conditioning] box, very close to the blower motor. FYI, we mechanics call the fan motor inside the cabin the blower motor. The electric fan motor behind the radiator is called the cooling fan motor.
If the resistor block is OK, then you have either a bad fan speed switch or a melted electrical connector at that switch. 95% of the time, the resister block is the problem.
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2 Answers

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I will assume the heater fan also doesn't work on low. You will need to replace the fan speed selector switch

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1 Answer

2003 ford focus not putting out much cold air from ac


Make sure the fans are running when AC is on. The fans should run all the time and regulate from high to low speed. If it does not run on low speed the connector for the low speed resistor has burned out. It is located between the two cooling fans and has two wires. Mine was burned and I clipped the wires and replaced the connector with two heavy duty female spade connectors. Cost 4.99 . Ac works fine now. If all the fans are operating correctly and ac is cycling on and off it may be low on freon .

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1 Answer

Fan for Ac and heater does not work on 2000 T & C van. It only works on low or high. All other settings are the same as low


replace the resister module for the fan,this is what controls the speeds,and most of the time the blower motor is what causes the module to go out,

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1 Answer

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You will need to inspect and test the speed control resister and the speed control knob first. What have you done so far?

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