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Engine Warning / Emissions control light remains on

Car over heating. Fan not working. Relays O.K. Disconnected switch so fan remains on to avoid over heating. Now Engine warning light (amber) stays on. Car still over heating & fan working. Any solutions..............

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  • 13 Answers

Thermostat

Posted on Jan 18, 2013

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SOURCE: ford focus ignition warning light

hi with the engine running at idle .get a multimeter and check for a voltage of between 13.5 volts and 14.7 at the battery terminals lower than 13.5 or higher than 14.7 replace alternator.

Posted on Oct 31, 2008

MNfisherman
  • 11896 Answers

SOURCE: Emissions warning light came on. Car runs great

It may be the computer itself. If the light keeps returning, either the computer is faulty or the fans are really failing. I do not recommend dealers but actual mechanic shops.

Posted on Jun 30, 2009

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SOURCE: dashboard warning brake light stays on continuosly nissan altima

Try this, Since you are applying the hand brake. Manually pull up on the emergency pedal and see if the light goes out. If this does work then you could have one of several problems. but, I am thinking that you might be able to adjust the brake tensioner if this car has one.

Posted on Jul 05, 2009

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SOURCE: Handbrake and Traction control warning lights illuminated amber

Had DTC warning light come on on my 120i (2005 reg). Without prompting dealer contacted BMW who agreed to pay for part and half the labour as it seems to be a common problem for 04-06 models.

Posted on Sep 17, 2009

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SOURCE: "emissions garage" warning light

this could be due to a large variety of possible different faults, the only way to tell is to take to a garage for it to be plugged in to a diagnostic code reader. Not always serious, somtimes as simple as an engine coolant temperature sensor fault, cheap to buy and quick to replace.

Posted on Nov 09, 2009

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I have a 1999 cadillac deville. My cooling fan is not turning on. My car is over heating. Is there a connection?


There is nothing really in the water-related part of the system that has anything to do with the fan. The hoses, thermostat, heater core, etc. are simply a conduit to move the water through the engine to provide cooling. The fan is the crucial element to avoiding overheating. While the car is in motion, air flows through the radiator, cooling the coolant down and removing the excess heat. Once you stop, however, or get in a stop-and-go environment, there is limited airflow through the radiator to provide this heat reduction. That is where the fan comes into play. What makes the fan work depends upon what you are asking the vehicle to do. Testing the fan circuitry is rather simple if you understand a few things. The fan only needs to run to cool the engine if the engine coolant gets above a certain temperature (usually about 220F). The fan will be ordered on and run until the coolant drops to about 180-190 (thermostat temp). The confusion is that the thermostat has something to do with turning the fan on. The thermostat only controls the flow of water through the system. It stays closed until the water temp reaches it setpoint (usually 180-190F), then open to allow water to flow through the engine. There is a coolant temperature sensor, usually installed near the point where the thermostat is, and it sends coolant temperature information to the ECM. The ECM uses this information to control fuel-air mixture and to control the cooling fan to operate when needed. The fan and the fan relay can be tested very easily by simply turning on the car's A/C. Even if your A/C unit isn't working, simply putting the dash controls to an A/C position, will automatically power up the cooling fans, since the A/C requires CONSTANT airflow thru the font of the engine to maintain cooling. If the fans don't work in the A/C position, then the problem is not likely to be the coolant temperature sensor. It is more likely to be a fan relay or the fan itself.

Oct 21, 2016 | 1999 Cadillac DeVille

1 Answer

97 toyota camry both fans continue to run


2 fans behind RAD
is 1MZ engine, the 5s is different. 1fan

1mz engine has 2 switches.
the twin fan engine is 1MZ (bingo)
the 1mz has 2 switches. a real pain when know one posts engine.
FSM data: ECT switches.
sw1--opens >208f closes < 190f
sw2.-opens >199f closes < 181f

i see the PCM has CF cooling fan control too.
my online source has 30+ pages of schematics
and covers it all but skips the fan wiring.
on the right fender fues box is the 4 or more fan /AC relays.
if you unplug the ECT sw1 or 2, or the relays im sure
you will find how is missing up and work from there.

it looks to me , (A/C drawings) that the PCM and A/C amp can both
control all fans but has 2 ways to do that.
PCM can see engine heat (ECT EFI) and activate fans when engine overheats, (normal at long idle times as stop sigs)
and the 2 , SW 1,'2 temperature switches are a backup i think too
all this and is staged, first 1 fan then next,
too bad the fan relay schematic is missing..

Feb 18, 2014 | 1997 Toyota Camry

1 Answer

2000 acura tl coolant fan after fluid change


New thermostat, installed, saw, new coolant made a little mess filling reservoir, (normal) checked fan fuse for some reason, and condenser fan fuse (xxx ?:), and temp guage, is slightly lower on gauge (than normal?) (disconnected xxxx? quit? a bit? to get to thermosta?.t no dash warning lights have a feeling I popped a relay.

Answer:

ok, you did a coolant service with STAT,

and it failed.

tell us what works right and wrong, symptoms only.

over heating? parked, (fan never comes on)? as it hits 225F?

under heating? ( fan stuck on , up North can cause huge cold engine)

dash gauge stuck low. (thermostat wrong heat range 180f is best. see FSM for spec. on this temp. spec..

Dash guage varies.? oddly (air in system)?

Dash gauge too high.? (Stat put in upside-down or bleed hole (jiggle) not UP side. higher side of mount , trapping air.)

Does something wrong happen only driving?

leaks?

does cap on rad hold 12-14psi pressure, hot.?

if car has fan belts, are they tight? (for sure water pump does)

Nov 19, 2013 | 1994 Honda Civic

1 Answer

Engine light came on and car is over heating. Took it to auto zone and was told it's the fan relay. Its a 2003 PT Cruiser, Turbo. I opened the fuse box under hood. There are 3 spots for relays in there...


Turbo Radiator Fan

The radiator cooling fan is a variable speed electric motor driven fan. The radiator fan assembly includes an electric motor, fan blade, and a support shroud that is attached to the radiator. The radiator fan is serviced as an assembly (fan motor/fan/shroud).

The variable speed radiator fan is controlled by the Powertrain Control Module (PCM) by way of a Pulse Width Modulated (PWM) signal. The duty cycle ranges from 30% for low speed operation then ramps-up to 100% for high-speed operation. This fan control system provides infinitely variable fan speeds, allowing for improved fan noise, A/C performance, better engine cooling, and additional vehicle power.

To control radiator fan operation, the PCM looks at inputs from:

Engine coolant temperature
A/C pressure transducer
Ambient temperature
Vehicle speed
Transmission oil temperature (automatic transmission only

HENCE CHECK THE PCM

Jun 26, 2011 | 2003 Chrysler PT Cruiser

1 Answer

Both coolant fans stopped working Checked both fuses the 40a and 50a both good


Hi, here are some things to check:

If you have a 12 volt test light, connect the test light to battery positive and probe the black wire with a brown stripe at the fan connector. The light should light, or you need to repair the ground connection.

Start the car and let it heat up. Then, assuming your horn works, borrow the horn relay to check the fan relays. Mark it so you know which one is good. Put the horn relay in each of the 3 fan relay sockets, one at a time, leaving the other relays in place. If putting the horn realy in any of the fan relay sockets works to turn the fans on, leave it there and buy a new relay for the horn.

If this does not work, pull out the fan high relay, start the car again (engine still hot) and probe the relay socket with your test light. Terminal 85 should light the test light.

If still no-go, you will need a voltmeter for the next test. Leave the sensor connected and use the voltmeter to probe the back of the coolant temperature sensor. Check the voltage on the sensor wires with the engine running. The reading should be between 1-5 volts DC. If not, replace the sensor.

If none of this works, consider replacing the front control module (in the same box as the fuses and relays).

Please let me know if you have questions, and thanks for using FixYa.

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coolant temp sensor location:
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Jun 05, 2011 | 2005 Chrysler 300

2 Answers

Is there some type of sensor that tells the thermostat to open or a sensor to tell the fan to come on if so whats the name of the sensor for 1995 acura legend my car just start doing this after i noticed a...


The thermostat on the radiator opens by heat automatically. The fan switch is run by the Engine temp Sensor and the ECM. If your fan is not running it is most likely a problem with the fan or the Temp sensor, I would look at the fan first.

Jun 23, 2010 | Cars & Trucks

3 Answers

Why does the heater blower stay on when the car is turned off and the keys removed its a bmw


are you talking about the fan blower inside the car or the fans under the bonnet..? the fans under the bonnet may stay on for a while after the engine is switched off to prevent heatsoak. This is when the engine actually heats up more after switch off due to latent heat within the engine. The fans will remain on until the coolant temperature has fallen and stabilised, then the fans will stop. If the blower fan inside the car keeps running, this may be a feature on the car to assist with heat soak but I would think this is more like a faulty power relay or fan controller if the car has climate control..In this case, my advice would be to consult a qualified autoelectrician.

Oct 31, 2009 | 2000 BMW 3 Series

1 Answer

1999 discovery is overheating, cooling fans are not coming


This is because of the improper circulation of the coolant, if the AC turned on then the engine load will be considerably increase and spoil the thermal switch (which initiate the cooling fan to run). So you better clean the radiator and check the radiator pump, then replace the thermal switch to get the things done.

Jul 23, 2009 | 1999 Land Rover Discovery

1 Answer

2000 Lincoln LS overheatjng with ac on. My coolin fan is not speeding up when i turn on my ac it runs the same


HI, there are three devices that control fan operation and speed as well. i recommend inspecting these three components for there operational value. test thoroughly and check the wires as well. if you detect any faults within these three devices, replace immediately. I will list the parts to inspect and there respective definitions as well.

Problem spots to inspect--

1.Inspect the Cooling fan switch-- The cooling fan switch on electric fans monitors coolant temperature signals from the engine control computer. When the engine is cool, the switch opens to keep the fan from spinning. When engine is warm, the switch closes to turn fan on for cooling.

2. Inspect the Cooling Fan Control-- This module Reads the temperature of the coolant and passes the information to the engine control computer (ECC). The ECC receives analog information and signals the cooling fan switch to cycle the cooling fan on or off, as required.(controls actual speed as well)

3. Inspect the Temperature switch-- A bi-metal, heat activated, switching device that controls an electrical circuit based on engine metal/coolant temperature. It controls the cooling fan(s), temperature light or gauge, fuel mixture, emissions controls and electronic-control unit functions. It's usually made of brass or stainless steel and uses a tapered pipe thread (NPT) for dependable sealing. replace if faulty.

You will find the problem in one or all of the above discussed areas.

Please rate and god bless:)

May 04, 2009 | 2000 Lincoln LS

2 Answers

99corvette overheating


Hi, I put together a guide that will help you diagnose this issue. it will help you troubleshoot all problem areas and lead you to the problem at hand.


Step1
Check for broken wires or loose connectors around the fan circuit. Inspect connectors at the fan motor, relay, sensor or heat sensitive switch, and the Electronic Control Module (ECM)--your car’s computer control system. Also, make sure to check for a possible blown fan fuse. These are common and overlooked troublesome spots that may cause a fan to fail.
Step2
Run and bring the engine to warm temperature. With the engine running, use a voltage test light to check for power to the motor fan. Be extra careful and make sure to Keep your hands and tools away from the belt, fan or any other engine moving parts. If voltage is reaching the fan motor, the test light should glow.
Step3
Turn off the engine after you see the light glow. Apply direct voltage to the fan motor from your car battery using a pair of spare wires. If the fan fails to operate, replace the fan motor. If the motor operates, your problem is in the motor connector.
Step4
Locate the heat-sensitive switch or heating sensor if the fan motor operates with direct voltage and the test light did not glow. You should find the sensor in the radiator, engine block, or thermostat housing.
Step5
Measure the resistance across the heating sensor with the multimeter. With the engine at cool temperature (engine off), it should register infinite resistance; with the engine at warm temperature (engine off), you should read low resistance. If both readings state infinite resistance install a new heating sensor, that’s the cause of your failing fan.
Step6
Check the action of the fan relay if the heating sensor is registering variable resistance. Your service manual should specify the power and ground wires according to color codes and the proper way to test it. If the fan relay fails the test replace it with a new one.
Step7
Check the connections going to the ECM after you determine the fan relay is working properly. If you find broken wires or loose connectors, make the necessary repairs. If you suspect a defective ECM take your vehicle to a service shop for a computer analysis. In most cases, the ECM is rare to be the cause of a failing fan. The above steps should take you to the root cause of your problem and help you fix the cooler fan.



  • Most automotive service manuals will show the wiring diagrams for the different electrical and electronic system components. Having the service manual for your car handy to locate components and look up specifications will make your troubleshooting task much easier.
  • A service manual can be purchased at most auto part stores. Also, most public libraries maintain an updated section of automotive service manuals that you can consult free of charge.
  • Keep your hands away from the fan, belts, or any other moving parts while working on your engine, they can easily catch and rip through your fingers, hands and arms.
  • Always wear short sleeve shirts and avoid wearing jewelry or watches while working on your car engine, especially while the engine is running. Clothes and jewelry can get trapped in moving engine parts and cause severe injury.
Please rate and have a great day:)

Apr 28, 2009 | 1999 Chevrolet Corvette

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