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Heater blowing cold air only

I have a Ford KA and the heater is only blowing out hot air.

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  • David36 Feb 22, 2008

    Tried moving to cool but it makes no different. Have checked levels and all appear OK.

  • David36 Feb 22, 2008

    The problem is that no matter what setting it is on only hot air is blowing out.



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It's almost certainly the heater control valve, which is mounted between the engine compartment and the plenum chamber (i.e. the area under the black plastic at the base of the windscreen). The valve is controlled by the temperature knob on the dash and has two rubber pipes going into each side of it (hot and cold) The part costs about £30 and all you need to fit it is a crosspoint screwdriver, a 10mm spanner and a pair of pliers, but access is difficult because you have to remove -- in this order -- both windscreen wipers, six rubber plugs and screws securing the black plastic trim, radiator header tank (just enough to tilt it forwards out of the way), three screws securing windscreen plastic to plenum chamber plastic, single screw securing both halves of windscreen plastic, three screws securing plenum chamber plastic to the body.

With all this out of the way, disconnect the wiring plug on the heater control valve, use pliers to remove the spring clips, pull out the two rubber hoses on each side and then remove the old part. Reassembly is the reverse of removal but DON'T forger to plug in the electrical connector. There's no need to drain the radiator because only a cupful of water wil be lost. Use an old towel to stop it getting everywhere.

Posted on Apr 18, 2009


Hey, David,

have you solved this problem yet?

Did you try moving the vent adjustment to cool position?

Please explain what you have done so far.

Posted on Feb 22, 2008

  • Anonymous Feb 22, 2008

    What is the real problem here? Is it cold air only or hot aair only? Look at your problem label and your reported problem.

    Generic problem for all System Cooling
    Heater blowing cold air only

  • Anonymous Feb 22, 2008


    My expertice is computer science, but I bet your cold air main cold air hose is blocked somewhere near the mixing point; that is where the vents seperate air before it reaches the fan. That is really a mechanics job now to open there and check. It's gotta be blocked by something.

    Good luch



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Posted on Jan 02, 2017

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your heater hose may have a leak or a blockage, preventing the hot water circulating. Pull off the heater hose and flush it out. Heater hose generally goes from your radiator T junction to the firewall of the vehicle.
Hope this helps

Posted on Dec 05, 2007

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