Question about 2005 Volkswagen Jetta
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Posted on Jan 02, 2017
Check for a switch at lower part of rad. Should see a wire harness & plug on a sensor at bottom of rad. This sensor/switch also operates fan on/off according to coolant temperature. You may need to disconnect battery to get at it safely.
Posted on Jan 16, 2009
Hi, Carson. Have you check your radiator for blockage? Or the car's cylinderhead gasket has blown, which will put pressure in your water system which in turn overheats the engine.
Posted on May 18, 2009
SOURCE: 2005 vw jetta gli turbo
The problem more than likely is the water pump. Like many VW's the water pump is plastic and it starts to fall apart after 50,000 miles. Coincidentally when you warranty ends.
Posted on Jun 16, 2009
There are two coolant temp sensors. One by the oil filler tube and one near the bottom radiator hose near the radiator.
When you flushed the coolant did you replace with VW rated G12 coloant? Very Important! - You can't use over the counter coolant - it'll cause sludge in your system. You have to use G12...
Hope this helps!
Please rate/vote! Thanx!
Posted on Jul 18, 2009
considering the remedies/replacements you have carried out have you checked that the cooling fan is operating ? also as for heater cold? this may be also the possibility that your engine has a cyl head gasket failure ie hot compression fro cylinder is blowing via gasket into cooling system resulting in this gas finding its way into heater pipes and air locks preventing coolant flow thro heater best advice is to have cooant pressure test or what is known as a sniffter test at the head tank this will determine if gasses are present from engine do you see any slight oil film in head tank? as this is another sign of gasket in early stages of failure a garage doing these tests will be able to confirm or not ? if h/gasket problem hope this helps ?
Posted on Dec 11, 2009
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