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Heater fan swith

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Got an issue with the heater I have replaced the unit under the dashboard and it still won't work it only works on number 4 switch 123 don't work any ideas at all 


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Hi J.B.2.2, I had this problem on my astra when I first got it. It turned out to be the heat control sensor on the heater. I replaced it and all the controls on the heater now work. It was a fiddly job, as on the astra, the glove box had to be removed for the less limited access that is needed. 

Hope this helps. 

Regards Andy. 

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