Question about 2003 Volkswagen Jetta TDI

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2003 Jetta temp guage not working - 2003 Volkswagen Jetta TDI

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Possible the Thermo sensor faulty.
Need more info...Any dash lights on...Is interior heater working correctly...Is coolant level ok...Is Temp gauge moving at all

John

Posted on Dec 08, 2009

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Posted on Jan 02, 2017

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SOURCE: temp. light on, looses antifreeze, temp guage up and down

When it's getting low on those fluids you have to add more. Don't run it low on anything you'll ruin engine. Get it into a shop as soon as possible and have it checked out, to see where the coolent is going. You should be checking your fluid levels when you put gas in the car, especially on an older car. Engines tend to use more oil as the miles get higher on the vehicle. Oil and anti-freeze are cheap engines are not.

Posted on Jan 02, 2010

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SOURCE: 2003 VW JETTA TDI TEMP GAUGE WAS GOING UP TO

Bleed the coolant system.

Posted on May 16, 2010

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Glowplug light comes on and goes off quikly, engine hard to start. Changed all 4 glow plugs and coolant sensor. Light stays on for a good 10 seconds when water temp. sensor is unpluged.


The glow plugs work in direct relation to the engine block temp. The relay for the glow plugs is obviously reading the wrong temp, that's why they turn back off. It's most likely that the temp sensor is bad, but trace the wires back and make sure there are no breaks in the insulation and they are well connected at the plug-ins. I have seen a lot of wires at the connector look good but fall off as soon as you touch them.

If the temp sensor is the same on for your your dash, then borrow a heat sensing gun and double check it against the guage. I have seen them read wrong by as much as up to 20 degrees. If the sensor reads rught and feeds both the guage and the glow plugs, then the problem would be either the wire harness or the glow plug relay. Hope this helps.

Oct 26, 2011 | 2003 Volkswagen Jetta TDI

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Temperature guage goes back and forth during normal operation


If it is in the center, once warmed up, then suddenly drops to cold then it needs a coolant temp sensor. They're very easy to replace, located in a black plstic coolant flange in the drivers side end of the cylinder head. It will either be black or green, with a connector with four wires coming out of it. It is secured by a whin black plastic clip.

If the temp does not go all the way down, it probably needs a thermostat.

Jan 30, 2011 | 2003 Volkswagen Jetta TDI

1 Answer

The temp guage bearly moves.


you are driving a cold engine or the gauge is disconected or mabe is the termostat stuk in the open what is good but it need to be change

Feb 08, 2010 | 1999 Volkswagen Jetta

1 Answer

Heater not producing enough heat. How do I determine the difference between poor exchange from the heater core and a faulty thermostat without throwing my money in the wrong direction. At idle the engine...


temp should stay about half while driving sounds like you have a bad thermostat if guage is half way at idle do you have heat feel both heater hoses should be about same temp if one is cooler not flow coolant

Jan 19, 2010 | 1988 Volkswagen Jetta

1 Answer

Jetta 2003 temperature gauge not working...


Replace it First as Overheating Can Damage it and cause Fauls reading or NO reading

Mar 14, 2009 | 2003 Volkswagen Jetta TDI

1 Answer

Jetta 2003 TDI


My mechanic in our town did a quick computer check. Car computer indicated a low level of antifreeze, he topped it up, cleared all messages off the car computer and said to watch the the heat guage for any further irregularities. I'll keep an eye on it, love the car, great mileage fun to drive.

Nov 05, 2008 | 2002 Volkswagen Jetta TDI

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