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This is probably due to low coolant in the header tank for the radiator.

While the engine is cold remove top on bottle this is the one that is connected to rad by hoses bottle is the small one right hand side of engine looking from the front .

Top up until mark on bottle if water goes down replenish .

Heater should then blow hot air.

DO NOT REMOVE TOP UNTILL ENGINE COOLANT GOES COOL OTHERWISE PRESSURE MAY SCOLD YOU.

Good Luck

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12y ago
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Q: How do you fix heater on vauxhall corsa its blowing cold air out is it just a matter of a fuse or is it a big job?
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