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Fiesta mk 5 heater problem

I have a fiesta mk5 zetec s and the heater keeps going cold.
i have had the car at a garage and they thought it was air lock.
they flushed the water out and it worked a bit better but has now gone cold again.
also the temprature gague keeps going onto the red (really high) and then slowly goes down again.
any ideas?

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  • stanleykarl Feb 10, 2009

    i have the same problem even after changing the heater control panel. were is the thermostate located is it under the alternator.

  • stanleykarl Feb 10, 2009

    head gasket happened to mine needs replacing


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The heater control valve on the fiesta mk5 are common to fail ...ebay £15 find two thin hoses going from the engine to the scuttle panel and youll see it .easy changeover

Posted on Dec 30, 2008

  • lummyno1 Dec 30, 2008

    sorry ignore my post didnt read the part about your temp gauge..most likely the thermostat


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Hi can anyone help w ive got a mk4 fiesta zetec s 1.2 .16v the temp is in the monal seting when the engine is up to temp but when i put my foot dwn its gose back to the very start on the temp like when u just start up anyone help would it be water pump goining

Posted on Oct 14, 2012

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Its the heater control valve that need replacing..
Kevin Ford Tec Hertfordshire...

Posted on Mar 09, 2010

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Yeh ive had the same problem wat u do is lift ur bonnet and in the middle of the dashboard compartment you;ll see two slim pipes connected to a cylinder shaped heater control valve and disconnect the switch and plug it back in and tap that cylinder lightly if it does not work then obviously a replacement would be required but it has worked with me and ive only had to do this twice in 18 months

its nothing to do with flushing the system as long as u have anti freeze in the system its that heater control valve thats a pain

good luck

Posted on Feb 09, 2009

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Sounds like a stuck thermostat or at least a faulty or backwards one, if it was put in upside down your temp would shoot up then slowly fall. Or else your radiator is close to being blocked. As for your blowing cold air I would bet that your heater core is blocked and needs to be replaced.

Posted on Dec 12, 2008

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