Question about 2003 Volkswagen Passat

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Over heats until I turn the heating on full but the heating not working properly

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Sounds like an airlock in the radiator,which will require the system to be bled out. The old school way was to undo the rad cap to relieve pressure,put the heater on full,slacken the bottom rad hose so that it leaks and then stick a hose into the expansion tank. Turn the hose on slowly until a steady stream with no bubbles comes out of the bottom hose. Now nip the bottom hose up,and turn off the tap. The only problem with this method is that it will flush out a lot of your antifreeze so it may be best to get a garage to do it for you. You could also have a faulty expansion tank cap. These need to be air tight to raise the pressure and allow heat to be generated a bit like a kettle. Could just be a few pounds. I'd try the expansion tank cap loose first with nothing else, leave the car like this,running for an hour,with the heater on max. You may get lucky. There is a slim possibility your rad fan could be gone too, listen out for it kicking in.

Posted on Jan 02, 2011


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