Question about 1995 Volkswagen Jetta

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Excessive fuel consumption & Assumed overheating

Hi, My Jetta3 cli guage is showing that the car is overheating. The electronic console unit reports correct temperatue 94 degrees. The car is using in excess of 14L/100km. This is attributed to the car thinking it is over heating and therefore supplying more fuel. The four pin temp/fuel which was causing the car not to start properly (but displaying correct temperatue). I've changed the four pin temperature switch (with the same yellow colour code), the car now starts properly but is using excess fuel and reports overheating. Any idea?

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Is the car an automatic, if so quickly check the transmission fluid levels and make sure they are where they should be. Is the car actually overheating or is it that it is just reporting overheating. I confess I never heard of a system that would respond to overheating by burning yet more fuel.....seems all wrong. If the car is overheating it could be because the car is actually burning more fuel. The fuel air mix is always enriched when the engine is cold at time of starting. Very quickly as the engine and the catalytic converter warm up the fuel is leaned out to normal running mix. Two further sensors to check are the air intake temperature sensor on the air intake pipe and the lambda sensor on the exhaust manifold. Either of these if faulty could allow the car to keep the fuel mix rich as the system still considers the car to be in cold start mode.

Posted on Apr 29, 2010


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Hi, My Jetta3 cli guage is showing that the car is overheating. The electronic console unit reports correct temperatue 94 degrees. The car is using in excess of 14L/100km. This is attributed to the car...

May be oxygen sensor which also regulates fuel. That plus temp sensor is main inputs to fuel control. As 02 sensor fails computer can send wrong amount fo fuel and this will eventually burn up your cataylic convertor which will cause more problems. scanners are hard to come by on bosch systems but you need to get some info on voltages coming from 02 sensors and look for cross counts which is an indication of reaction times for the sensor. It should show movement from high to low voltage as the computer adjusts fuel. If the signal is staying in one range the computer will keep adding fuel thinking it is running lean. Hope this helps a little. If so please reply as this helps me continue to answer questions here and good luck

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