Question about 2004 Volkswagen Polo 1.4

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2002 vw polo 1.4 only blows cold air (fan works fine on all speeds)

Is there an electric valve? If so is it buried in the dash? Difficult job or not? I am reasonably skilled

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  • rocketlll
    rocketlll Nov 04, 2012

    IThankyou for your replies so far, I know that there is a known fault with the resister located on the side of the heater box but when faulty this stops the blower working on all speeds bar full. This works fine, the problem is that I am only getting cold air from the blower in the cab, there appears to be hot water supply from the engine going to one of the pipes that goes through the bulkhead from the engine compartment but it remains cold on the exit pipe from the heater matrix. I have been told that there is an electric valve that opens to allow the water through and that it may be in the cab under the dash somewhere, before I reduce my car to a box of bits and a mornings worth of cussing I just wondered if someone could confirm? Thanks in anticipation. T



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In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Posted on Nov 04, 2012

  • rocketlll
    rocketlll Nov 06, 2012

    Is it confirmed by a diagnostics plug in?



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SOURCE: Faulty AC swith vw polo 2005

Hi Bronkhhl ? Sounds like your heater motor resistor ir wiring is faulty . Regarsd VW Audi tech

Posted on Jan 20, 2009

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SOURCE: VW Polo Dash Instrument's

buy a repair manuel from a parts store. Check to see that it has the wiring diagram in the manuel.

Posted on Nov 22, 2008

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SOURCE: running fine then wont'nt start

You will have to pull a spark plug out to check that you have spark when cranking the engine,while you have the plug/s out do a compression test to determine health of engine and wether it is in fact giving compression,eliminates other potential faults if compression is good.If you have compression(around 140 ish)and introduced fuel and it wont fire up it only leaves electrics as the fault.3 major engine requirements to run Fuel,Compression,ignition.When checking spark at night is best as you can easily see wether you have the correct type of spark,Blue and if its quite you will hear the spark as well.Your fault is consistant with ignition module,coil or lack of power to ignition.Faulty modules will give a spark but its too weak to ignite fuel and the spark will be yellow in color.Let me know how it goes.Good luck

Posted on Nov 17, 2008

  • 119 Answers


I have changed a few cylinder heads under warranty for this type of problem. The exhaust valve guides wear, this causes the exhaust valve to seat badly, giving low compression. if one cylinder compresion reading is more than about 50 psi below the others, then this warrants head removal. It is quite a job, due to the fact that the camshft id chain driven. If you are up for it then once the head is removed, poor liquid into the exhaust ports and see if it leaks out through any of the exhaust valves.

Posted on Jul 23, 2009

  • 1 Answer

SOURCE: vw polo heater blowing only cold air

Daughter's R reg VW Polo has heater probs, only just started, fan working fine and temp gauge works normally but only blows cold air. What do you think could be the prob ?

Posted on Dec 15, 2009

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