Question about 2004 Mitsubishi Galant

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AC only runs at low fan speed setting, but turns off at high speed setting

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Bad blower motor resistor

Posted on Nov 18, 2009

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I have 2007 Suzuki XL7. I replaced radiator and fan assembly. Fans do not work. Is there a relay? If so, where is it?


Most fan and Ac relays are located in the under hood fuse and relay box. Adequately marked in owners manual or on plastic cover

Sep 03, 2016 | Suzuki XL7 Cars & Trucks

1 Answer

Engine cold. Start engine reading says engine hot ac off. Fans run all time.


Are the fans running on low or high ?
Circuit/System Description
The engine control module (ECM) commands the fans ON in either high speed or low speed, depending on cooling requirements. In low speed, both fans are turned ON at a reduced speed. High speed has both fans turned ON at full speed.
In low speed operation, the ECM applies ground to the coil side of the fan low relay. This energizes the coil and applies voltage directly to the left cooling fan through the switch side of the fan low relay, which is fed by the fan 1 fuse. The right fan is connected in series to the left fan through the de-energized fan control relay so that both operate at low speed.
In high speed operation, the ECM applies a ground to the coil side of the fan low relay, the fan control relay , and the fan high relay. On the fan high relay, the energized coil closes the switch side of the relay and applies voltage directly to the right cooling fan through the switch side of the relay, which is fed by the fan 2 fuse. At the same time, the ECM energizes fan control relay pulling the switch side over, providing a direct path to ground for the left cooling fan, which has voltage applied through the energized fan low relay. In high speed mode, the fans are operated as a parallel circuit with full voltage applied to each.
You should have it hooked up to a scan tool that can read engine sensor data parameters . Check for DTC'S - diagnostic trouble codes etc...
Circuit/System Verification
  1. If DTCs P0480 or P0481 are set, perform those diagnostics first.
  2. Ignition ON, verify with a scan tool that the control module is not commanding fan activation.
  3. Ignition ON, observe that the fans are not activated.
Your best bet is to take it to a ASE certified repair shop !

Jan 10, 2016 | 2009 Chevrolet Silverado 1500

1 Answer

My ac is not working I have a Chevy Tahoe 2005 the fans won't turn on either .


Hi Maria , The A/C system wouldn't keep the fans from running but none working cooling fans will keep the A/C from working ! This is a fairly complex system if your not familiar with this sort of thing ! I will add the description from the factory service manual.
Cooling Fan Control - Two Fan System
The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the powertrain control module (PCM) to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood fuse block.
During low speed operation, the PCM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from the low fan fuse through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the cooling fan s/p relay and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the PCM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. After a 3 second delay, the PCM supplies a ground path for the high speed fan relay and the cooling fan s/p relay through the high speed cooling fan relay control circuit. This energizes the cooling fan s/p relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the high speed fan relay coil is energized closing the relay contacts and provides battery positive voltage from the high fan fuse on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have there own ground path. The result is a parallel circuit with both fans running at high speed.
Do you have a check engine light lit ? The thing to do would have it check at the dealer or a ASE certified repair facility ! They could hook up a advanced scan tool an diagnose fairly quick ! Or you could find a wiring diagram an try testing with a volt meter yourself ! But watch yourself so you don't short out the PCM - engine computer !

May 01, 2015 | AC Cars & Trucks

1 Answer

Why does my fan continue to run after car is shut off?


Which fan are you referring to? The pusher fan in front of the radiator is tied to the AC system. If it continues to run for an extended period after you turn off the key, then there is likely a problem with the relay. I think your model year has the 2 speed fan. Does the fan run at high speed or low speed when you turn off the car? Does it do it if the AC is off?

Oct 13, 2014 | 2000 BMW 528i

1 Answer

2005 equinox ac fan only works at low speed. I just had it flushed and coolant added last year


There are two relays for the fans. One is a low speed relay and the other is a high speed relay. There are also fuses for the fans high speed and low. Take the cover off or the under hood fuse box and on the inside of the cover it will give a diagram of the fuses and relays. Try swapping the relays with something else and see if the fans go to high when you turn on the A/C as it always should. Sound like a bad High Speed Fan Relay to me but check it out.

Jul 21, 2011 | Chevrolet Equinox Cars & Trucks

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 .

Jun 24, 2010 | 2003 Ford Focus

1 Answer

Ac speed problems


Replace the blower motor resistor.

May 11, 2009 | 1998 Chevrolet Astro

1 Answer

Ac & heater


Disconnect the wire from the fan, turn the car on, test the voltage between the connector to ground (chasis) on all fan speed settings (high,med,low). If you have voltage at all settings (approx. 12.3V on high and less as the speed setting is lower) then replace the fan motor (about $50 at autozone). If there is not voltage on all speed settings you will also need to replace the blower motor resistor (about $12 at autozone). The whole process takes about 20 mins.

Oct 09, 2008 | 1999 Oldsmobile 88

1 Answer

Radiator fan problem


Call up the dealer and ask what commands the fans to come on once the car reaches operating temp, on alot of imports, there is a fan control box of some sort that actually sends the sig to the fans to come on.

If it's the temp sensor and the computer tells the fans to come on you could be looking at a faulty computer.

This would deffinetly be worth taking to the dealer to diagnose so that you don't keep wasting your time and money chasing a ghost.

Sep 02, 2008 | 1995 Nissan Altima

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