Question about 1999 Volkswagen Jetta

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2003 Volkswagen Jetta overheating in a few minutes of driving. The fans are working and it has a new thermostat and is not losing any coolant.

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  • Anonymous May 19, 2009

    Same problem, and I just changed the thermostat to no avail. The upper hose is really hot, the lower hose is cooL.

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  • Master
  • 490 Answers

Sounds like the radiator has blockage feel the lower hose and see if it is the same temp or close to the same as the upper hose

Posted on Apr 15, 2009

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Jetta 1.9 TDI 2006 the cooling fan comes on five minutes after starting


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2004 Jetta 1.8T is only overheating when driving, and I can't drive more than a few minutes before overheating. At idle, it stays at 190. I have replaced all hoses, water pump, and thermostat. Any...


check the oil if it has a milky color to it then its a head gasket the engines were aluminum so if they over heat they usually warped the head

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I bought a 2004 VW Jetta GLS 1.8L Turbo earlier today. It has a clean carfax and recent (within a week) negative dealer diagnostics...it overheated. Well...it overheated within 2 minutes of hard...


Hold the dealer accountable, for starters! It could be the thermostat, a coolant leak, a severe engine problem, who knows? You shouldn't have to concern yourself with diagnosing and fixing a car you bought yesterday, unless you bought it as-is.

Feb 18, 2011 | 2004 Volkswagen Jetta

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I may have added too much coolant. After adding it, I drove for about 15 minutes. A few hours later, the tempurature gauge light came on. I check the coolant level again and there was nothing in the...


No, you can't add too much coolant. Rather, it does not hurt anything if you do. Did you add it to the radiator, or to the overflow tank?

Let it cool, then remove the radiator cap, and if needed, add coolant to the radiator. Put the cap back on, and fill the overflow tank to the "full - cold" line. Start it and run it a few minutes and look for leaks. If you find no leaks, drive it for a day or two, then let it cool and check it again. If it is down a lot (without overheating), you have a leak somewhere. If you lose enough coolant, that will make it overheat. However, if it overheats, that can cause loss of coolant, when you stop the car, you will see steam and smell coolant, and often hear it boiling.

If it overheats again, make note of when it happens: driving on the highway, or stop-and-go around town. Overheating on the highway usually indicates a clogged radiator, while in-town overheating usually indicates a bad cooling fan (you don't need the fan above about 30 MPH). A bad fan is usually the fan relay, but it can be the fan thermostat (different from the engine thermostat), or a bad fan motor.

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Sounds like you have coolant leak if you are loosing coolant or a bad thermostat. I would replace the thermostat, they run about $10. The other fan is an aux fan and will only run when the a/c unit is on.

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I have a 2003 VW Jetta 1.8t that is overheating. Replaced the thermostat, temp sensor, water pump. Fan will run when AC is on, but haven't had it running in hot enough weather to see if the cooling fan...


Assuming engine tune / mechanical condition is not the cause of the overheating:-
Ensure cooling fan is cutting in at the appropriate engine temperature - check operation of the fan controlling relay,
Ensure fan switching control temperature sensor is serviceable,
Ensure cooling system is filled properly, taking care to bleed out air where necessary,
Ensure coolant pressure cap is of correct rating and in serviceable condition,
Check coolant hose on suction side of waterpump is not softened and collapsing at engine revs above idle,
Ensure radiator core is not blocked or cooling airflow inhibited by insects etc.

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Coolant light on


You say it's overheating, more info needed such as:
Is the engine temp gauge showing that it's overheating?
Is it actually 'boiling over' and losing coolant?
If it's running hot, but not losing coolant, check to see it the cooling fan is operating when the engine temp rises. You may have a bad cooling fan switch that is not signaling the fan to go on to lower the engine temp.
It could be a stuck (closed) thermostat that is preventing proper circulation of coolant after the car reaches operating temp.

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