Question about Cars & Trucks

1 Answer

How do I fix a fan switch that runs on high continuously.

The center fan switch turns the fan off and on - but the left fan control runs at high when in any position.

Posted by on

Ad

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 98 Answers

Make, model, year?

Posted on Dec 07, 2014

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

3 Answers

I have new blower motor. it dosen't stop running


Could be a bad blower motor resistor,mounted by the blower.

Sep 28, 2016 | 2002 Dodge Ram Pickup 1500

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 car 2008 Chevy Uplander warning light came on stating A/C shut off for engine protection. My question exactly as 1posted 2011. Gauge not Reading. Fan running continuously. Doesn't seem hot.


What gauge not reading , Temperature ? you posted back in 2011 ? You did feel you should take it to the repair shop ? You need to take this to a ASE certified repair facility ! This is a complex electronically controlled cooling system , Three relay's controlled by the ECM -engine control module turn the fans on in two different speeds ! There could be DTC'S diagnostic trouble codes stored in the ECM, HVAC module , BCM !
Circuit/System Description
The engine control module (ECM) commands the fans ON in high speed or low speed. In low speed, the fans are configured in series. In high speed, the fans are configured in parallel.
In low speed operation, the ECM applies ground to the coil side of the low speed fan relay, which is the Fan 1 Relay. Voltage is applied directly to the left cooling fan through the switch side of the low speed fan relay. The right fan is connected in series to the left fan through the de-energized Series/Parallel relay, which is Fan 2 Relay, so that both fans operate at low speed.
In high speed operation, the ECM applies a ground to the coil side of the low speed fan relay, the Series/Parallel relay, and the high speed fan relay, which is the Fan 3 Relay. Voltage is applied directly to the right cooling fan through the switch side of the high speed fan relay. The left cooling fan obtains voltage through the low speed fan relay and ground through the Series/Parallel relay.
When the ECM is commanding a fan relay ON, the voltage of the control circuit should be low, near 0 volts. When the ECM is commanding a fan relay OFF, the voltage of the control circuit should be high, near battery voltage.
One of the relays could be stuck on ! An for the gauge you have to have it removed an fixed , there is a stepper motor behind the gauge needle an they go bad ! Or replace the instrument cluster !

May 14, 2015 | Cars & Trucks

1 Answer

My 2002 impala headlights don't work at night or in dark places like a tunnel or under a bridge, they only work in the day time. I have day time runner lights and they automatically turn on when I start my...


You can't turn them on manually with the switch . You have the switch set on auto ?
Headlamps
You can use the headlamps in two different ways.
• Place the headlamp switch in the ON position for normal operation.
• Place the headlamp switch in the OFF position for automatic lamp control (ALC). During ALC the high beam headlamps are On at reduced intensity for daytime running lamp (DRL) operation in daylight conditions, or low beam headlamps On in low light conditions.
The DRL/EXT LTS fuse and the EXT lamps fuse in the underhood junction block supply battery positive voltage at all times to both of low beam lamps and to the right high beam lamp. The low beam circuit continues to the high/low beam switch, then, depending on the position of the dimmer switch, connects to the normally-open headlamp relay switch contacts. Placing the headlamp switch in the HEAD position provides a ground path for the headlamp switch input of the Body Control Module (BCM). After receiving this input, the BCM energizes the headlamp relay. When the headlamp relay is energized, the low beam circuit is connected to ground G201. The high beam circuit is divided into a left and a right side circuit.
The DRL/EXT LTS fuse in the underhood ignition block supplies battery positive voltage to both the coil and to the normally-closed contact of the DRL relay switch circuit. During high beam operation, the left side current flow is through the closed contacts of the DRL relay, and to the left high beam lamp.
The EXT Lamps fuse in the top of the engine fuse block supplies battery positive voltage to the right high beam lamp. Both high beam circuits are then connected together, and continue to the dimmer switch. When the driver closes the high beam contacts of the dimmer switch, the circuit is grounded at G201.
Both the headlight switch and the BCM provide a ground, or control circuit, to the headlight relay coil circuit for manual or automatic headlamp operation. When you place the headlamp switch in the OFF position, and the ambient light sensor indicates low light conditions, the BCM energizes the headlamp relay for low beam operation. You may switch the headlights to high beam by pulling the dimmer switch handle toward you until the dimmer switch is activated. When the dimmer switch is placed in the HIGH position, the indicator lamp input to the BCM is pulled low. The BCM then sends a class 2 message to the instrument cluster in order to illuminate the high beam indicator lamp.
If the headlamp switch is left in the head position, the inadvertent power control feature will turn off the headlights 10 minutes after you turn the ignition switch to the OFF position. If you place the headlamp switch in the head position after the ignition switch has been turned OFF, or if the ignition switch is in the ACCY position, the headlights will remain ON until you turn them OFF or until the battery runs dead.

Dec 07, 2017 | Chevrolet Impala Cars & Trucks

2 Answers

Air conditioning


please follow this steps and fix it.
A fan failure, or a failure of the fan relay or control circuit is bad news because it can allow the engine to overheat.
Five things may prevent an electric cooling fan from coming on:
  • Defective temperature switch or coolant sensor
  • Engine thermostat is stuck OPEN (engine never gets hot enough to turn on the fan)
  • Failed fan relay
  • A wiring problem (blown fuse, loose or corroded connector, shorts, opens, etc.)
  • Bad fan motor
ELECTRIC COOLING FAN QUICK CHECKS.
One way to quick check the fan circuit is to start the engine and turn on the A/C to max. If the fan runs, the fan motor, relay, fuse and wiring are all okay. But this test doesn't show if the temperature switch or temperature sensor and PCM are energizing the fan when coolant temperatures are high.
To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until it reaches normal operating temperature. Most fans should come on when the coolant reaches about 200 to 230 degrees. If the fan does not come on, something in the control circuit is defective. Resistance checks should then be made on the temperature sensor or switch, and a voltage check on both sides of the relay (you will probably need a wiring diagram of the fan cooling circuit on your vehicle to identify the relay terminals and wiring connections).
The fan motor itself can be checked by using jumper wires. Unplug the wiring connector on the fan, and use the jumper wires from the battery to route power directly to the fan. If the fan motor is good, the fan should spin at normal speed when supplied with 12 volts. Noisy bearings or a slower than normal speed would indicate a worn motor.

Jun 11, 2013 | Cars & Trucks

1 Answer

Radiator fan will not shut off


In some vehicles, the radiator cooling fan is controlled independently by a thermostatic switch. What you perceive as a problem actually is normal operation. When the temperature reaches a certain point, the fan turns on. When you stop and turn off the ignition, the fan continues to run until the temperature decreases to a point where the fan turns off

May 11, 2013 | Pontiac Grand Am Cars & Trucks

2 Answers

Overheats unless ac is running


The thermostat may be stuck. If it dosent open then the engine will overheat. If you turn the ac on then the air rushing around the engine will help cool it down. Replace the thermostat and it should fix it

Dec 30, 2012 | 2008 Pontiac Grand Prix

2 Answers

I have a 01' New Beetle my cooling fans come on high speed when the ignition is turned on and stay on while the motor is running. Have already changed out the coolant temp sensor, control module, radiator...


I finally fixed the problem. It wasn't the Water pump, or the Fan switch or the Green Temp Switch or the Fan Control Module but the "BLACK" NOT White, 2 Pin Thermal Switch 112c" It does sit in between 3 collant hoses where the upper radiator hose comes together with 2 smaller hoses. Kinda looks like a peace sign and in the center sits the 2 Pin Thermal Switch. It's not a AC Cut off switch which even the dealer tried to sell me and which I actually ordered from ECS tuning. The AC Cut out switch is "White" and even thou looks the same in size and form will not fix the issue. I was able to read the part number off the old switch which is 357919369F which when I looked it up on the ECS tuning web site did bring me to the right switch. Black with a green stripe on the top rim. I ordered that baby and it came in yesterday. Took the White switch out and put the Black switch in and guess what the fans no longer turn on when the ignition is in position 2 and now the fans come on when they are suppose to and don't sound like a jet engines afterburner. Simple 20 dollar part solved the problem. I think a lot of people are getting the wrong part from the dealer since this part is very hard to find. Everyone I asked wanted to give me that white sensor AC cut out switch but that isn't it. Here is the link to the correct switch hopefully it will help someone avoid a bit of frustration. http://www.ecstuning.com/Search/357919369F/ES248948/

May 15, 2010 | 2001 Volkswagen Beetle

1 Answer

Heater fan continues to run when heating system turned off.


Your Heater Power control module is bad I just had the same problem you can find it right behind the glove box it is mounted in the heater duct very easy to fix 2 screws and it is out and cost is about 150.00 at the dealer it is a dealer only part.

Dec 29, 2008 | 1996 Chrysler Town & Country

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

25 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

78267 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

14405 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...