Question about 1997 Volkswagen Jetta

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I have a 1999 jetta the engine sometimes starts to race out of nowhere can you tell me what the problem might be someone said it might be the coolant air sensor

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It may the "MAF" Mass airflow sensor

Posted on Jul 08, 2009

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Volkswagen troubleshooting


Use a coolant pressure tester. I had no luck at autozone (loaner), but the kit that harbor freight sells has the right adapter for vw. This will tell you where any leaks might be that are opening up when engine is running under pressure, but close with no pressure and just sitting in your garage.

Jul 02, 2014 | 1999 Volkswagen Jetta

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2004 mazda mpv engine racing and cooling fan not working


coolant temp sensor tells the computer how hot or cold the engine is so it can regulate the idle and fuel mixture, when it fails there usually is no cooling fan and you will have trouble starting the engine and keeping it running.

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The MK3 VW's are prone to failure of the "coolant flange", which is located to the right of the valve cover, and will have 4-5 hoses and or sensors sprouting from it.

I'd be willing to bet that this is the source of your leak, not the cam pulley.

The part is inexpensive.

Jan 18, 2010 | 1999 Volkswagen Jetta

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2000 Jetta VR6 temperature gauge sometimes dips down to zero or fluctuates while driving. I've checked the coolant levels and for leaks on the driveway/engine compartment and I can't see any signs of a...


remove radiator cap on resevoir and remove hose on the side hold hose over bottle have someone start the car hold rpm at 3000 if coolant isnr rushing out of the hose the water pump is bad if coolant flows the temp sensor is bad

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1 Answer

VW Jetta 1998 Coolant Temperature Sensor V6 2.8L


haynes is the best manule on the market
go to local book store and spend 30 bucks you will be glad you did they v[come with pics and every thing
indigo books is allways a good start

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1 Answer

1999 Volkswagen Jetta overheating


If it was the water pump you should know very quickly. It would be very loose and woobly. It should be leeking out of the front of the block. Trying bringing it to a jiffy lube that does a high pressure antifreeze treatment. They will be able to free up any flow obsrtuctions or tell you if you need a new thermostat.

Jun 24, 2009 | 1999 Volkswagen New Jetta

1 Answer

2001 Jetta 1.8T, 100K miles. Smokes when hot.


Ouch! you've got engine coolant in the exhaust from a leak somewhere...DO NOT run this engine until you get someone (dealer is best in this instance) to diagnose ($50-125)

Jun 14, 2009 | 2002 Volkswagen Jetta TDI

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1999 VW New Beetle Coolant Temp Sensor


at the back of the cylinder head gearbox end it sits in the water pipe

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