Question about 2000 Plymouth Grand Voyager

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Ac evap. fan does not turn on when ac is engaged. Fans do work just need to know what relay energizes the fan

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The fans are controlled by a relay mounted behind the driver side headlight. The computer grounds the relay when ac pressure gets above 200psi.

Posted on Jul 20, 2013

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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

My Renault Espace Mk III radiator fans are not switching off, even if you disconect the temperature sensor. both relays are okay. Some say it's the aircon pressure switch. Anyone knows where is the...


turning of the ac switch will indicate if it is an ac problem for the fans.
some cars have the radiator fans running for up to 10 minutes after shut down . Run the fault codes to see if there is a faulty temperature sensor. how it works is this
the sensor is connected to the ecm and has power passing through. it When the sensor sensor a preset coolant temperature the power to the ECM is altered and so the ECM energizes the relays for the fans. If the fans are running continuously after shut down then the ECM still has the relays energized as it is still reading the requirement from the sensor.

Feb 07, 2015 | Renault Cars & Trucks

1 Answer

Why do radiator cooling fans start when key is put in on position


Under normal operation, in low speed, only the LH fan is initially in operation. Voltage is supplied to the low speed cooling fan relay through circuit 60 BK/LG wire. When the relay is energized, voltage fed to the LH cooling fan motor through circuit 538 GY/RD wire. Ground for the cooling fan is through circuit 57 BK wire. After the LH fan has been energized for 5 -10 seconds the RH fan will start automatically. Voltage is applied to the RH fan motor through circuit 3829 LB/BK wire. BK wire circuit 57 is also the ground.
Under normal operation in high speed both fans should operate from the high speed cooling fan getting a command voltage on circuit 30 BK/LG wire. The relay energizes both fans through circuit229 RD/OG wire while the low speed fan relays are de-energized.
The fans will come on immediately when the airconditioning compressor clutch is engaged mode and when the vehicle is in Drive. OBD-II trouble codes are P0480 low fan 1circuit, P0481 hi fan circuit & P0482 medium fan circuit.

Jul 14, 2014 | 2006 Ford Escape

2 Answers

Radiator fans won't come on while van is running


Start the car and turn on the AC to max. Do either of the fans run with the AC compressor engaged? Also, there is a temp sensor for the fan circuit but I don't know exactly where it is located on that vehicle.

Sep 17, 2012 | 2003 Chrysler Town & Country

1 Answer

Compressor and fans do not turn on until rev engine


I passed this question the first time I read it, so I will take a stab at it now.
The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch.
I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ?
Speeding up the engine would increase voltage from the alternator.
This is assuming the serpentine belt is tight and everything else is working correctly.
I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.

Jul 24, 2012 | 1992 Buick Regal

1 Answer

Radiator fan relays


You need a book. The fans come on when the pressure switch sends a signal to the BCM to energize the fan relays. If the freon charge is low the ac system won't build up enough high pressure to activate the fans. If the pressure switch is bad the computer won't know the pressure is high enough to need the fans. And so on.

Jun 23, 2012 | 2009 Ford Flex

2 Answers

AC/heating fans don't work


The relay center is under the hood, there should be several with the same #'s switch one that you know is working in place of the fan relay, if fans turn on replace relay. It is faster to turn on ac after switching relays for diagnostics as fan should run as long as ac is on...

Dec 10, 2009 | 2004 Honda Accord

1 Answer

When I turn on my a/c the car starts to everheat


When ever the car overheats,it is always the best thing on your car,to check the cooling fans.When the ac is on,look to see if the cooling fans are running,and running fast,and smoothly.In your case,I am going to go out on a limb,and say they are not.First check for blown cooling fan fuse.Then,if the fuses are alright,check the cooling fan relays,most likely more than one.One prong,or spade coming out of the relay,is ground(where it plugs up).To make the relay energize,ground this terminal with a test light .Just like you are using the test light to check for 12 volts.When you touch the ground spade on the relay it will energize the relay to turn the fans on.Just pull the relay out of it`s spot,just enough to touch the spade.Do this with the ac on,and engine running.The clutch relay on most cars will energize the relay,but the ac compressor is working on your car,so it is either the fan relay,or the high side switch on the ac system that is bad.Try and see if the cooling fans,both of them,or one of them,will come on by them selves as the car warms up,with the ac off.The fan or fans should come on,and go off by themselves.Don`t let the engine overheat,keep a good eye out not to let that happen.If the fans never come on,then,the fan,or fans could be bad.You can test them by running wire from battery to the fan,and grounding to frame.Now the fuse,or relay being bad will also cause this.If a fuse is blown,then ,one or more of the fans are bad,and will have to be replaced.The fans cool the radiator for the engine and transmission cooling,and the condenser for the ac system.If the condenser is not cooled down,the ac freon will be to warm to cool the vehicle.If I can help,let me know.>>roniecon@gmail.com

Aug 26, 2009 | 2000 Honda Civic

1 Answer

New radaitor cooling fan won't engage


check the fan relay it may be bad. if fans are not working right a/c wont work right either

May 21, 2009 | 2004 Chrysler Sebring

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