Question about 2004 Ford F150

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The heating and air conditioning fan only works on the highest speed position. What would cause the lower speeds not to work?

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If the system is a Manual ( not the EATC / Electronic Automatice Temperature Control System ) it is most likely the blower motor resistor.

For the new body style 2004 ( not the 2004 Heritage or Lightning models ), it is behind the glove box.
Open teh glove box, press on one side, to allow the glove box to hang down.
The Blower motor resistor is located in the side of the blower motor housing.

the heating and air conditioning fan only works on - ea44d96.jpg

If your 2004 is a Heritage or Lightning, the blower motor resistor is access from under the dash / glove box arthe heating and air conditioning fan only works on - 7e8c043.jpgmg src="/uploads/images/7e8c043.jpg" alt="7e8c043.jpg" class="h_mi" />

On this type ( same as the 97-03 ) the blower motor resistothe heating and air conditioning fan only works on - 452e89b.jpgsistor and pigtail might need to be replaced.
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Just pay attention to which body style 2004 you have ( new like the 2005-2008 or the 2004 Heritage / Lightning, which looks like the 97-03 MY trucks.

Posted on Aug 12, 2010

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Posted on Jan 02, 2017

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Need help with 03 ford focus 1.4 estate,issue is with the heating on the dial 1,2,3 nothing happens on 4 heating motor works fine and help as iv checked all fuses and connectors and I'm stumped as to wat...


The highest fan speed setting bypasses a device that reduces voltage to the fan for the lower speeds.
This is a fairly common failure but the actual mounting of this device can be anywhere; firewall in the engine compartment or under the dashboard.

Oct 06, 2014 | Cars & Trucks

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I have a 2000 Chevy Prizm and the air conditioning fan only works in the highest position. My guess is that one of the relays is bad. If that's correct, which relay is bad?


Sounds like a bad blower motor resistor. Since high speed bypasses the resistor and the lower speeds use the resistor and don't work, the resistor is the most logical answer. It is usually mounted near the blower motor under the passenger side of the dash.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

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The fan speed selector switch control only works on the highest speed. When I put the switch to the lower speeds there is no air, and I can't hear the motor working. It's as if it is off in the lower fan...


Hello Imrevoy.
When this symptom happens your blower motor resistor has gone open circuit.
When on the high fan position it sends full battery power to the fan so it bypasses the resistor.
That's why, now how to repair?
Here's the manual instruction.

  1. REMOVE GlOVE COMPARTMENT DOOR
  2. REMOVE ENGINE ECU
    1. Disconnect the wire harness clamps.
    2. Disconnect the connectors.
    3. Remove the 2 bolts and engine (and ECT) ECU.
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  1. Two way flow heater models only: REMOVE AIR DUCT (Motor cover)
    1. Disconnect the control link.
    2. Disconnect the connector clamps.
    3. Remove the screw.
    4. Release the claw and remove the air duct.

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  1. REMOVE BLOWER RESISTOR
    1. Disconnect the connector.
    2. Remove the 2 screws and blower resistor.

  1. INSTALL BLOWER RESISTOR
  2. Two way flow heater models only: INSTALL AIR DUCT
  3. INSTALL ENGINE ECU
  4. INSTALL GLOVE COMPARTMENT DOOR

There you are, I hope your repair goes well.
Thank you for using FixYa.

KL

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Fan resister circute/switch needs to be replaced. Not expensive. Buy from dealer.

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Usually when the blower fan only operates on hi speed, its because of a failed blower motor resistor. You still have hi speed because on hi, the power going to the blower motor goes directly to it, as opposed to the lower speeds, when the power is routed through the resistor, thus lowering the voltage, which in turn lowers the speed of the fan. The resistor is usually located near the blower motor itself, under the hood back near the firewall.

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AIR CONDITION


replace switch, works 9 times out of 9.

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