Question about 2002 Volkswagen Jetta TDI

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Overheating The car is over heating, I have changed the Thermostat, Washed the radiator, serviced the break systems, still it continued. It heats up every seconds

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  • responsiveru May 19, 2009

    The radiator fan is running when it overheats. I will also check the fins of the van to know if it is bent.

    As at yesterday the oil sign was showing on the dash board so I thought there is shortage of oil and added some oil but after sometime I gauged the oil and found out there is enough oil but the sign has stopped as at today.

  • responsiveru May 19, 2009

    I would try the solutions offered and give you feed back later.

  • marionbagget May 11, 2010

    Is the radiator fan running when it overheats ?

    If you wash the radiator, use very low or no pressure. The fins are very easy to bend on the radiator. you can straighten them out however.

  • Anonymous Mar 14, 2014

    I changed my theromastat but my car still over heats can it be the radiator



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I hate to say it but you have a major leak. Either your head gasket is leaking water into the oil, or there is a crack in your engine, possibly in the head or there still is a leak in a hose. Draining the oil to see if there is any water in it will help to eliminate that possibility. Of course you must pour the drainings out slowly because the water will be on the bottom. The other way is to take it for a drive and then pull the dip stick out to see if the oil has that milky look. Also look to see if anything is dripping after you have driven it. I think It may just be a bad hose or clamp. good luck.

Posted on May 19, 2009

  • maltmt2 May 20, 2009

    I saw your comment and the fan should be on when the car gets hot, thats its purpose. I hope you have found out the problem. If not the bottom line is that there is a leak. Sometimes it cant be found untill the system is presurized. It short the car is hot. When the car has cooled down so that you can check the water in the radiator. Do so, if it needs water add some and then drive awhile to see if it gets hot. Once again check the radiator when it has cooled down. If the water is lower thats your proof you have a leak. The possiblities are, hose leak, head or gasket leak, thermastat not installed and the biggy a crack in the engine. good luck


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Volkswagen 2002 Jetta TDI

Here is an alternate view.
When you checked the thermostat I am assuming you noted that its housing was good and you refilled the radiator and bottle.
After the car cools down check the radiator to see if you are losing fluid. While the car is running, can you smell antifreeze at the exhaust pipe ? If yes you have a blown head gasket.
Is anything leaking on the ground ?

I take it you have the radiator full and the drive belts properly tensioned.
Here is the ordered check list;
1) Get the error code read-outs. Many chain auto part stores will loan a meter to get this for free. Call. They may be mis-leading because of other problems, but may still be useful.
2) Correct fuel
3) If the radiator fan is running while the car is hot you may need to check the water pump for water circulation.

Posted on May 19, 2009


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When your temperature gauge reaches "H' it may too late to prevent a major breakdown. Knowing the symptoms of an overheated car and how they occur may be the difference between being inconvenienced and incapacitated.
Identification:---Other than a low oil level or low oil pressure light, there is not a more significant part of a car's instrumentation than a rising temperature gauge or a glowing "Hot" light. These lights are really the only confirmation a driver has that his car is really overheating. It is the identification of the symptoms of an overheating car that enable the motorist to avert a badly damaged engine. Overheating is always a traumatic event for a car's engine, which makes the early identification of the symptom an important addition to the informed motorist's tool kit.
Stuck Thermostat:--The car's thermostat is a valve that controls coolant flow from the engine block to the radiator. When the engine is cold the thermostat remains closed so that the coolant can reach operating temperature quicker and also provide heat to the passenger's compartment. The thermostat has a spring on it that moves depending on coolant temperature causing the thermostat to open. Sometimes the thermostat fails to open thus restricting coolant flow to the radiator where it would be cooled down. This condition is often the cause of overheating. The symptoms of this cause would be a rising temperature gauge and possibly the loss of heat inside the car.
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No Heat and Overheating in 1999 Chevy Silverado

After replacing the thermostat, you must bleed the air from the cooling system.

To bleed air from the 2.2L and 2.5L engines, remove the plug or sensor on the top of the thermostat housing. Fill the radiator with coolant until the coolant comes out the hole. Since the plug is made out of steel and the thermostat housing is aluminum, it is a good idea to apply an anti-seizing compound or Teflon® tape on the plug threads prior to installation. Install the plug and continue to fill the radiator. This will vent all trapped air from the engine.

Any trapped air in the heating system will have to be displaced by coolant. Once the cooling system is filled, with the radiator cap off, turn of the heater at it's highest setting. Start the engine and allow it to reach operating temp. You should see a drop in the coolant level as the air in the heating system is displaced by coolant. Add coolant to the proper level and replace the radiator cap.

Keep a close eye on the coolant level for at least the next couple of weeks. The cooling system is a "closed" system. Any significant decrease in coolant level indicates a problem.

If you have any questions, let me know.

Please take the time to rate this solution.

Drive safe and be warm.


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