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Discussion Starter #1
Heater not putting out any heat, fan works fine on all speeds, hoses goi g to matrix are both hot, any ideas / advice.
 

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Either a blocked matrix, an airlock or the heat distribution flap is not moving.
 

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You dont say what model or year but I know the astra g has a bypass valve fitted and if this fails it can allow the coolant to run in and out of both hoses without going through the matrix.
 
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