Question about 2003 Volkswagen Passat

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Heating problem hi i was vondering can a defective coolant temp.sensor cause no heating in the car.it blows only cold air the car doesnt over heat it and its running normally.

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  • passat 130 Jan 10, 2013

    thanks stephen finally it was heater core that was not circulating well

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2 Answers

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  • Volkswagen Master
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I doubt it.
The sensor is for the computer and the temp gauge on the dash.
If the heater hoses are getting hot, and the radiator is full of coolant, you may have a blend door problem.
The blend doors direct air thru the heater core and the vents.

Posted on Jan 08, 2013

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  • Contributor
  • 43 Answers

Change cap on top of water overflow bottle, usually blue, and empty coolant and top up with 4 litres vw antifreeze and fill up rest with filtered rainwater .

Posted on May 15, 2014

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Posted on Jan 02, 2017

  • 784 Answers

SOURCE: my heat not workini but blow cold air where is

Has the car been changed coolant since it was bought? If it is time to change, let do a flush through a heater core. There are 2 coolant hoses going thru a fire wall. One for coolant in and one for coolant out. Heater only works if coolant is flowing through the heater core. Therefore, there are one or both following cases contributes to the problem: 1-If the valve control coolant flow gets stuck, then it always closes  so there is no heat. 2-If the valve is working, but the heater core gets clogged up, then there is no heat.

Posted on Oct 11, 2009

  • 599 Answers

SOURCE: coolant temperature sensor?????

um...strange ...engine temp reaches 210 before thermostat opens and lets water circulate ..fans go on before that normally..180 or so..hot air from heater going to cold air? strange...could you elaborate for me /us?

Posted on Nov 10, 2008

  • 131 Answers

SOURCE: Seat Leon 1.6 - Heater blows cold air & occasional engine o/heat

first check the coolant level and for contamination always check cool or cold fill the resivoir and if it has a rad cap check it too if all looks good then maybe t- stat

Posted on Feb 25, 2010

dj_relly999
  • 4070 Answers

SOURCE: Fan is blowing cold air only

good day, you may have some heating core issues, anti freeze leakage, have it checked. hope this helps, have a nice day

Posted on Feb 09, 2010

the terrier
  • 94 Answers

SOURCE: volkswagen jetta over heating

hi tammy
it could be an air lock stopping the water from circulating properly i seem to recall this problem on the older VW Derby and audi 50 (same engine) there is a small bleed screw at the highest point on the cooling system that allows you to bleed this air out youll find its location in the manual

another thing to try is put a flushing agent through the system incase there are any blockages in the radiator itself

hope this helps

Posted on Oct 28, 2008

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Your temp sensor has nothing to do with your heater. The temp sensor needs coolant in order to work properly. So first check the coolant level because if it is low your heater will act the way you describe. Once the coolant gets low enough the heater will blow cold. Another possibility is the radiator cap. After the engine has warmed up it expands when it cools down it contracts. As it is contracting if the cap is weak air can be drawn into the system and cause air pockets to form and will cause the same problem

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