Question about Volkswagen Jetta

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2003 vw 18.t temp lights goes on but temp gauges read normal

2003 VW Jetta 1.8t is over heating. The coolant is topped off and the temp gauge reads 150f when the temp light comes on. I do notice the coolant tank having a bubbling sound and after the car sits all the coolant is gone. Now when I start the car the temp gauge is low until the car warms up and than it sits at 150 and never goes higher when this temp light starts blinking.

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If your coolant overflow is bubbling then regardless of what your gauge says you are having overheating issues. If your coolant is missing with no aparent leaks then you need to check your oil for a milky consistency and apearance which would most likely point to a blown head gasket. This would also explain overheating. Hope this helps

Posted on Dec 27, 2013

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Posted on Jan 02, 2017

greg_margo
  • 1959 Answers

SOURCE: coolant problem

Very possible the thermostat is bad, especially if you used a sealant before fixing the radiator. A blocked thermostat would prevent coolant from going to and from the reservoir, causing it to back up.

Posted on Sep 06, 2009

  • 1 Answer

SOURCE: 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.

Posted on Nov 05, 2008

  • 271 Answers

SOURCE: My 95 jetta 2.0 temp light blinks even though I

There is two sensors-blue for fuel mixture preparation & black with 4 pins for a gauge and overheating control.You told me that you has been change all sensors.Did you put new ones? Also check for engine coolant level sensor on a white plastic tank. there is not another reason for LED to blinking.

Posted on Dec 07, 2009

miket756
  • 2702 Answers

SOURCE: 2003 VW Jetta 1.8T Temp Guage/False Overheating Issue

your car is cooking!!!! if your heater starts to blow cold air its got an air lock in the system and need to be blead out to get this air out of the water jaket in the engine sounds like your gauge is working fine to me, its screeming at you to stop! as its over heating the engine, look under your hood for the water hoses you should find a hose with a kind of nut or screw in it at the higest point on a water hose, this is the bleed point, fill the rad up with water and turn on the heater to hot only do this when the engine is COLD undo this screw or nut start the engine up and watch the water flow out this bleed point till there is no more air coming out with the water, keep the rad full of water and you dont need to put the rad cap back on till the air has been bled out but keep the rad full of water all the time after all the air is out refill the rad or top it up put the cap back on and run the motor it should not show as hot as it was and the heater should work just fine

Posted on Jan 15, 2010

  • 271 Answers

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

Bleed the coolant system.

Posted on May 16, 2010

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Very possible the thermostat is bad, especially if you used a sealant before fixing the radiator. A blocked thermostat would prevent coolant from going to and from the reservoir, causing it to back up.

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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.

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