Question about 1999 Volkswagen Passat

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MY 2000 VW Passat Temperature Gauge rises to 90 but doesn't go above when the car overheats. What could be the problem?

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Faulty temperature sensor locate it going into the block and replace its located on the block itself usually drivers side or in the front has 1 wire coming out from it ...as far as overheating is concerned does the fan relay kick in and possibly you need the thermostat changed or is there enough radiator coolant in the radiator .

Posted on Sep 08, 2009

Testimonial: "The overheating was due to a crack in the radiator which has now been fixed, the fan kicks in at the correct temperature. It must be a sensor problem."

  • Duane Morse
    Duane Morse Sep 08, 2009

    thank you for the reply back John Birch

  • Duane Morse
    Duane Morse Sep 10, 2009

    glad you found it i knew it had to fall upon one of them points of starting points

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1 Answer

2004 vw passat check engine light .


This car has 2 separate temp sensors, 1 for the computer and 1for the gauge, you need to be sure the engine is not overheating first, but most likely it's a bad coolant temp sensor causing a false reading..

Jun 10, 2012 | 2004 Volkswagen Passat

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My serpentine belt broke on a 2000, 90 hp Passat TDI. Would you have a diagram (6 pulleys). Thanks


The serpentine belt routing diagram on a 2000 VW Passat 1.9 TDI - 90 HP

tdisline_479.jpg
CS = Crankshaft
F = Fan pulley
Gen = Alternator
T = Tensioner
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PAS = Power Assisted Steering

WP = Water Pump

Apr 28, 2011 | 2004 Volkswagen Passat

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MY TEMP GAUGE ON 2005 TDI 130 PASSAT IS RISING NEARER 100oC WHEN CRUISING AT HIGHER SPEEDS, IT COMES BACK DOWN TO 90 WHEN SPEED REDUCED, COOLANT LEVELS FINE AND WATER LEVELS OK, ANY IDEAS PLEASE?


100 degrees is the normal operating temperature for the motor. If it goes higher than that, the thermostate needs to be replaced. The temperature will be higher on the highway because the engine is producing more heat energy due to the higher load on the motor. Diesels idle cooler and the engine will cool down at idle or lower speeds. That is why it is best not to idle your car for long periods of time because this will cause deposits in the engine and glaze the cylinders. The engine is working normal from what you described and there is no reason to worry. I hope this helped.

Mar 29, 2011 | 2005 Volkswagen Passat

1 Answer

WHERE IS THERMOSTAT LOCATED ON 2000 VW PASSAT AJM ENGINE


Heed of antifreeze coolant temperature!!!
First time you might check the thermostat operating.
The thermostat location for VW Passat 4Motion 1.9 TDI - AJM engine, is on back of the alternator at the bottom side of the bracket.
IMPORTANT: It is NOT necessary to replace the alternator if you want to change the thermostat !!!
Thermostat checking:
1. Cold engine. Start up the engine and watch of the water temp indicator. After first value 60 Celsius Degree you still warm up the engine until the lifter (pointer) reach 80 C deg. (second mark after 60 C deg.). At this time you let engine running at idle speed and check with your hand the thermostat plastic housing and hose temperature in bottom left side of the engine. Heed of alternator driving belt and ventilator fan !!!
2. If the thermostat is good the hose must be cold until the water temp indicator reach almost 90 C deg.
3. The thermostat opening temperature is 87 C deg.
4. If the hose is already warm the thermostat is out of order.

Thermostat location, Part number: 044121113, in german - "Kuehlregle" (Price around $25):

tdisline_142.jpg
Important note: Always replace the thermostat seal, position 7 in the above picture.

Please do rate my response. Thanks!

Jan 05, 2011 | 2000 Volkswagen Passat 4Motion

2 Answers

Car is running hot (temp gauge rises above normal)


Try the overflow tank cap. The seal will go bad and not hold the psi causing the water to flow out this is something you will not always see which will cause the engine to overheat or temp gauge to rise. Also the thermostat could be sticking and cause the temp gauge to rise. Are the fans turning on when the temp gets high? If so then I would resort to the above first. If the fans are not coming on, the relay or fan/s could be the problem.

Jun 29, 2010 | 1996 Mercedes-Benz C-Class

2 Answers

Fans do not stay on long enough to cool engine adequately. they only run for about fifteen seconds and then turn off


I'm not sure if you got my first posting so I'm gonna send it again.
Coolant type should be the pink one , make sure its the correct mixture. Get shop manual and make sure thermostat is the correct one for your vehicle and is correctly installed. Don't forget to check the condition of the water pump/ and its belt. If A-ok at this point here's how it works. thermostat controls engine temperature, coolant temperature sensor (CTS) tells ECU to turn on/off the fan/fans via a relay, relay does the deed.Your gonna need some type of temperature measuring gauge a electronic device is prefered and a digital volt meter (DVM). Some DVM have a temperature probe feature. Use the temperature measuring gauge to see if the thermostat is operating within the specified range. Then use your DVM and shop manual to see if the CTS is telling the ECU to turn on the fan/fans via the rely and if the rely is responding accordingly. I've done two of these vehicles with milage above say 88k and both of them I;ve replaced the relay on. Good luck and keep me posted.

Mar 02, 2010 | 2000 Toyota Camry

3 Answers

Where is the temperature sending unit on a 1999 VW Passat located.


VW Passat & Audi A4 1990-2000

Motronic System
The Engine Coolant Temperature (ECT) sensor is mounted in the water outlet on the back side of the head. If you vehicle still has a original VW part it will be black in color with a four terminal connector. This device signals the engine management system with the current coolant temperature, the ECU takes this information and uses it to control other such circuits as the idle speed, knock control system, oxygen sensor circuit, exhaust gas recalculation, and fuel tank venting. It is also important to note that if at any time ECU does not receive a signal from the ECT it will substitute a value of 176°F (80°C).

VR6
The Engine Coolant Temperature sensor is mounted in the thermostat housing. The body of the sensor will be blue and the sensor will be blue and have two terminals if it is an original factory VW part.


The engine coolant temperature gauge uses a heat sensitive sending unit to transmit an electrical signal to the gauge. The sending unit is a heat sensitive variable resistor that is located on or near to the cylinder head and threads into an engine coolant passage. The sensors are a Negative Temperature Coefficient (NTC) type. As the temperature increases, the electrical resistance of the sensor decreases. As the coolant temperature changes, so does the resistance of the sensor. The gauge is calibrated within the operating range of the sensor and interprets the resistance value to display the coolant temperature.On models produced prior to 1994, the engine coolant gauge temperature sensor is a single wire terminal sensor.

Beginning with model year 1994, the engine coolant gauge and the Engine Control Module (ECM) temperature sensors were combined into one sensor with 4 terminals. The basic operation remains the same in that their resistance decreases as the coolant temperature increases, however the actual resistance values of the 2 sensor circuits are different. The electrical connector of the 4-wire terminal sensor (1 and 2) is keyed to prevent improper connection of the sensor's electrical circuit.

WARNING When trouble shooting electrical components, always consult a wiring diagram for the particular year, make and model to ensure proper test equipment connection and diagnosis. Failure to use suitable test equipment and testing methods could permanently damage the electrical component(s).

225902c.jpg

Fig. Beginning with model year 1994, the Engine Coolant Temperature Sensors combined the sensors for the ECM and the gauge into one sensor-1997 2.8L V6 sensor shown


2ae243e.jpg

Fig. The electrical connector for the combined temperature sensors is keyed to avoid improperly connecting the sensor's wiring-1997 2.8L V6 connector shown

I hope help you with this, good luck (remember rated this help).

Oct 13, 2009 | 1999 Volkswagen Passat

1 Answer

VW thermostat


Hi
my engine (VW 1.9 TDI 115 BHP)doesn t warm up.Can you help?
Thanks
Costello

Aug 04, 2008 | 2000 Volkswagen Passat 4Motion

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