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Heater issues


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Good afternoon all,


I have an old W reg fiesta Zetec S 1.25 LX.

My heating system is stuck on cold air.

I have replaced the control valve under the bonnet and swapped out the control unit for one that definitely works and it still isn't working.

From what I can see the Coolant isn't leaking, the level definitely hasn't dropped.

I have looked through the internet / Google and every post relates to the parts mentioned above.

Is there something else in the car that could cause the problem. How common are heater matrix blockages and how can I test for this.

Any help genuinely appreciated.

Apologies if this is not the correct place for this post.





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