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Old May 17th, 2010, 07:03   #7
dieselfuel
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Join Date: Dec 2008
Location: ohio
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Check thermostat first, it's the easiest thing to check.

Drive the car til the engine reaches max. op temp. (20-30 min.) Park the car and turn of engine. Remove the coolant tank cap SLOWLY to remove any built up pressure (usually there isn't much built up pressure, but be careful non the less).

Take a temp reading by placing a stainless steel meat thermometer into the coolant. You should get a temp reading of at least 180F. Anything less, and you need a new thermostat. I'd pay the big bucks ($35-50) for a genuine VW part. Aftermarket thermos for these TDI's have been known not to work well. Also, you may want to spring for a new thermostat housing since they are plastic and may get damaged when removed. THEY ARE USUALLY LESS THAN $10.

If your thermo checks out o.k., then I'd look at the fuel filter next. But, I bet you have a faulty thermostat.

Please keep us informed.

Good luck!
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2003 Jetta TDI 200,000 mi. Horrible fuel milage? Check your thermostat: http://forums.tdiclub.com/showpost.p...49&postcount=7
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