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2003 vw jetta tdi 1.9lt, temp light flashes on cold days

When starting the car for the first time of the day if its cool out side 50 degrees or less sometimes warmer. The engine temp light comes on. the MIL light does not and no codes are given. If you run the engine or a few minutes and then restart the light will not come back on all day. The coolant level is ok and there has never been any leaks. The engine coolant temp works fine and so do the cooling fans. The engine never over heats either. This only happens on cold morning starts.

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  • jeff_vw_tdi Sep 04, 2009

    Thank you for the extra info. that really helps alot. I kinda figured it was a sensor but had no clue which one. Again thanks you for the help.

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  • 13 Answers

Hi it sounds like you have a temp sender playing up I think there are 3 on your engine,

Posted on Sep 03, 2009

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I just got an oil change in my 2003 vw jetta. The next day my oil light started flashing and beeping and won't stop. Should I be worried??


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My 2000 Jetta TDI blows cold air while driving. No fun this winter! I would expect a bad thermostat; but I understand if the thermostat is bad a warning light would be lit on the dash. Is that the case?


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First time you might check the thermostat operating.
Heed of antifreeze coolant temperature!!!

The thermostat location for 2000 VW Jetta 1.9 TDI, is on back of the alternator at the bottom side of the bracket.
IMPORTANT: It is NOT necessary to replace the alternator if you want to change the thermostat !!!
Thermostat checking:
1. Cold engine. Start up the engine and watch of the water temp indicator. After first value 60 Celsius Degree you still warm up the engine until the lifter (pointer) reach 80 C deg. (second mark after 60 C deg.). At this time you let engine running at idle speed and check with your hand the thermostat plastic housing and hose temperature in bottom left side of the engine. Heed of alternator driving belt and ventilator fan !!!
2. If the thermostat is good the hose must be cold until the water temp indicator reach almost 90 C deg.
3. The thermostat opening temperature is 87 C deg.
4. If the hose is already warm the thermostat is out of order.

Thermostat location, Part number: 044121113, in german - "Kuehlregle" (Price around $25):


tdisline_250.jpg
Important note: Always replace the thermostat round seal, position 7 in the above picture.

Please do rate my response. Thanks!

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