Question about Audi TT

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How do I check if an Audi tt 1.8 coolant sensor is faulty?

My engine temperature reading is in the red almost straight after starting but the radiator water is not too hot. You can open the expansion tank tank cap and touch the water with your finger. I am having to replace the rocker box expansion pipe because it has perished. Is the water sensor below and could it be effected or damaged by oil and dirt from above. I have cleaned around that area with Jiser and did not notice any problem with the temperature before cleaning. The Jiser was washed of with water, could this cause the problem with the sensor and cause it to give high readings.

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  • Master
  • 813 Answers

Hi have a look on utube there is a good vidio that will make things easy to do yourself,hope this helps all the best.

Posted on Apr 21, 2017

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dennymulford
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SOURCE: 96 Deville Overheating....TroubleShooting

did you run a compression check? if so and its good then you have a blockage in the water jacket
if not then you have a head gasket leaking

Posted on Feb 26, 2009

  • 2 Answers

SOURCE: Dash Temp Gauge reading extremely hot

I had an issue with my 95 taurus and we ended up having to replace the thermometer

Posted on Mar 05, 2009

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SOURCE: coolant leak from left side of engine block running down oil pan.

when you say left side are we talking passanger side or drivers side if drivers side which is my guess most likely your waterpump seal is leaking

Posted on Mar 22, 2009

  • 23 Answers

SOURCE: engine check light read p0171 and p0420, noticed a leak of engine oil on cylinder 2 area of head gasket when checking the sparks plug, is that the cause?

may be oil feed to cylinder head replace gasket

Posted on Apr 20, 2009

  • 9 Answers

SOURCE: I have an Audi TT Coupe - 2002 - and the gas gauge

Rick, Unfortunately, you aren't alone. This is a fairly common problem on the Audi. Price of the panel replacement is in line. Just get a warranty on the panel, in case its a sending unit problem instead of the panel.

Posted on Jul 03, 2009

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2000 daewoo leganza is overheating, leaking anti freeze, and water. what is wrong?


sound like thermostat sticking close.replace thermostat and radiator pressure cap.if already done.you could have faulty water pump.if engine overheating at long slow traffic line or setting at a stand still.the engine cooling fans should be running, check and see if cooling fans running if not,check cooling fans fuses and relays.if all is good,hot wire make sure coolings fans okay.if all is good,code scan vechicle for faulty engine coolant temperature sensor and ecm problems.you need a code scanner where you can check live data check see if coolant temperature sensor reading correctly if engine coolant temperature is 190 degrees the coolant sensor. the scanner suppose to show 190 degrees in temperature if not it reads 80 or 90 degrees the engine coolant temperature sensor is faulty need replacing.if all is good check engine oil if look like milk shake blow head gasket will cause over heating.to be on the safe side i would replace thermostat and radiator pressure cap first.to make sure engine coolant circulating through radiator and engine block.

Nov 15, 2011 | 2000 Daewoo Leganza

1 Answer

Overheating


OVERHEATING CAN BE CAUSE BY MANY THINGS LIKE FAULTY THERMOSTAT AND FAULTY RADIATOR PRESSURE CAP,TOO MUCH WATER IN COOLANT SYSTEM NEED 50 / 50 WATER AND ANTIFREEZE.LOOK FOR WATER PUMP WEEP HOLE LEAK, IF COOLANT LEAKING OUT WEEP HOLE WATER PUMP BAD NEED REPLACING.CHECK FOR LOW COOLANT LEVEL, YOUR RADIATOR OVERFLOW JUG SHOULD HAVE COOLANT AT THE FULL COLD MARK IF NOT KEEP ADDING COOLANT INTO COOLANT OVERFLOW JUG UNTIL COOLANT STOP DROPPING AND FULL COLD MARK, IF OVERFLOW COOLANT JUG WAS EMPTY RADIATOR IS LOW ON COOLANT.WHICH CAUSE AIR IN COOLANT SYSTEM KEEPING THE ENGINE COOLANT TEMPERATURE SENSOR FROM BEING SUBMERGE IN HOT COOLANT WHICH TURN ON THE COOLANT FANS.WHEN ENGINE COOLANT TEMPERATURE GET CERTAIN SET TEMPERATURE LIKE 190 DEGREES THE PCM AND COOLANT SENSOR WILL TURN ON COOLANT FANS, IF VECHICLE OVERHEATING COOLANT FANS NOT WORKING EITHER YOU HAVE FAULTY ENGINE COOLANT TEMPERATURE SENSOR CHECK COOLANT FANS FUSE AND RELAYS. YOU CAN CODE SCAN CAR TO SEE IF YOU HAVE FAULTY PCM, FAULTY ENGINE COOLANT TEMPERATURE SENSOR OR FAULTY COOLANT FAN RELAY.IF COOLANT FAN AND ENGINE COOLANT TEMPERATURE SENSOR OKAY,YOU HAVE CORRECT COOLANT LEVEL IN COOLANT SYSTEM, THERMOSTAT AND RADIATOR PRESSURE CAP BEEN REPLACED, YOU COULD HAVE BLOWN HEAD GASKET CHECK ENGINE OIL LOOKS LIKE MILK SHAKE HEAD GASKET BLOWED ALSO WHEN HEAD GASKET BLOWED YOU CAN DRIVE CAR SHORT DISTANCE START OVERHEATING AND YOU LOOSE ENGINE POWER SUSPECT BLOWED HEAD GASKET.

Aug 04, 2011 | 1999 Oldsmobile Alero

1 Answer

I was told that the actuator motor was faulty and causing my audi TT to overheat. what is this actuator motor and what does it do for my car???


I presume it is the A/C Fan controller they are referring too.

This is an electronic relay controller that runs the coolant fans at different speeds and is also responsible for denying a/c operation when the Engine ECU detects an emission fault.

If the 'Check Engine' lamp is illuminated or the 'Throttle Body Adaption' has not run, a/c will not come on....but fans for cooling the engine should run when needed .

One way to check is to turn on the ignition to RUN but without engine running, activate the a/c and see if the cooling fans are running. If they are running, the Controller is generally not the problem.

If they are not running, the above applies to a certain extent in the course of diagnosis.. These controllers fail often and yours may have done so.

To further check, use a test lamp or DVOM to check for Battery voltage at the fat RED wire going to the Fan Controller.

The controller have two relays inside with a logic board, two plugs from the main loom, to the fan and a/c system...... plugs are socket keyed so only fit on one position in the controller..

Radiator Fan is activated by the engine ECU sending a signal to Fan Controller when the Coolant Temperature Sensor reports coolant exceeding normal temperature .

These Controllers live under the front chassis member below the battery and are held in place with two bolts, accessible after removing the battery and tray......IIRC.

Audi TT : Electronic Fan Controller part # 1J0 906 381 B. Your Audi parts deptment will tell you if this part have been updated with a C, D, or F designation. You can also find them at PartsGeek.com

Jan 19, 2011 | 2003 Audi TT

2 Answers

2004 audi a4 temperature is going on high when driving and then temperature goes to normal when i stop


SOUND LIKE FAULTY CLUTCH FAN OR THE AUXILIARY ELECTRIC COOLANT FAN NOT RUNNING. CHECK AUXILIARY FAN FUSE AND RELAY. IF LOOK GOOD HOT WIRE TO SEE IF FAN TURNS ON IF NOT FAN FAULTY. IF FAN RUNS YOU HAVE FAULTY THERMO SWITCH. WHICH LOCATED AT THE BOTTOM OF RADIATOR ON THE LEFT HAND SIDE OR ON THE LOWER RADIATOR HOSE ON THE RIGHT HAND SIDE OF THE ENGINE COMPARTMENT.IF FANS OKAY COOLANT LEVEL CORRECT.REPLACE THERMOSTAT.HAVE RADIATOR AND ENGINE FLUSHED.CHECK IN FRONT OF GRILLE MAKE SURE NO DEBRIS BLOCKING OFF AIR FLOW THROUGH RADIATOR CORES AND AC CONDENSOR CORES.

Dec 26, 2010 | 2004 Audi A4

2 Answers

Where to find the coolant temperature sensor on an audi tt


The Engine Coolant Temperature (ECT) sensor on an Audi TT 1.8 Turbo:

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Nov 08, 2010 | Audi TT Cars & Trucks

1 Answer

Radiator fan will not run unless straight wired to battery.


CHECK COOLANT FANS FUSE AND RELAYS IF BOTH OKAY.THE ENGINE COOLANT TEMPERATURE SENSOR FAULTY OR PCM FAULTY HAVE VECHICLE SCANNED AND CHECKED.

Nov 01, 2010 | 1995 Buick Century

1 Answer

Over heating


CHECK COOLANT LEVEL IN RADIATOR. BUT WAIT UNTIL THE ENGINE COOL DOWN. CHECK WATER PUMP.IF YOU SEE COOLANT LEAKING FROM WEEP HOLE REPLACE WATER PUMP. REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP WHEN CAR OVERHEATING IF CAR AT A STANDSTILL IN LONG TRAFFIC LINE OR MOVING SLOWLY.COOLANT TEMPERATURE SENSOR FAULTY.NOT TURNING ON COOLANT FAN.CHECK COOLANT FAN FUSE AND RELAY.IF ALL IS GOOD.HOTWIRE COOLANT FAN.IF COOLANT FAN DONT COME ON FAN MOTOR FAULTY.IF FAN COMES ON CHECK ELECTRICAL WIRE CONNECTOR FOR DAMAGE WIRES.

Sep 17, 2010 | 1994 Audi Cabriolet

1 Answer

My radiator fan is not working on my 2006 Dodge Charger


Hi, If you have truble code check/service engine soon light on,then go to your local Autozone part store for a free scan. If not,i'm going to start with haveing you check the cooling fan relay,this can be found in the power distribution box,this can be found in the engine compartment.I would change places with another relay with the same number on it. If this takes care of it,buy a new relay and it was an easy fix. If not here's tests you will have to do as long as you have a digital volt meter.

Operation printpage_icon.gif

The Engine Coolant Temperature (ECT) sensor is used to sense engine coolant temperature. The sensor protrudes into an engine water jacket.
The ECT sensor is a two-wire Negative Thermal Coefficient (NTC) sensor. Meaning, as engine coolant temperature increases, resistance (voltage) in the sensor decreases. As temperature decreases, resistance (voltage) in the sensor increases.
The PCM compares the ECT, Intake Air Temperature (IAT), and Ambient Air Temperature (AAT) under cold start conditions. Following a start to run delay time, the sensor values are compared. If the one sensor value is not within a specified range of the other two sensors, the value is determined to be irrational





2.7L, 3.5L & 5.7L Engines


  1. Turn the ignition off.
  2. Disconnect the Engine Coolant Temperature Sensor (ECT) harness connector.
  3. Turn the ignition on.
  4. With a scan tool, read the ECT sensor voltage.
  5. The sensor voltage should be approximately 5.0 volts (plus or minus .1 volt) with the connector disconnected.
  6. Turn the ignition off.
  7. Connect a jumper wire between the (K2) Engine Coolant Temperature Sensor (ECT) signal circuit and the (K900) sensor ground circuit in the ECT harness connector.
  8. Turn the ignition on.
  9. With a scan tool, read the voltage.
  10. The sensor voltage should be approximately 0.0 volts (plus or minus .1 volt) with the jumper wire in place.
  11. If voltage is present as stated suspect faulty ECT sensor.

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I hope this helps,Thank You for using fixya, iluv2fish..... Ray.......

Jun 30, 2010 | 2006 Dodge Charger

1 Answer

The orange engine warning light is lit and the engine surges between 4,000 and 5,000 rpm


The first step is to delete the fault code:
Disconnect + wire on the battery for one hour. Turn ignition ON but do not start the engine. Leave it on so the throttle resets automatically. Turn ignition OFF and then start the engine as you normally do. Go for a 15 minutes drive, Audi reccomends to not let the engine idle, go for a normal drive so the ECU reads the values from all sensors again and remaps the ignition and fuel timing. If after all this the Engine Service light stays ON the engine needs to be diagnosed by an Audi workshop as it could be a lot of things, from a faulty coil pack, to an oxygen sensor or maybe a coolant/air temp sensor...

Jan 30, 2010 | 2001 Audi TT

2 Answers

Cooling fans not kicking in at high temperature.


problam could be with your coling temperatuer sensor .make sure fuse for you raditor fan is good.and you have coolant in you raditor.

May 20, 2009 | 2003 Audi TT

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