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car heaters blowing cold air even when on no 4?

when driving car motorway heaters are cold and will not blow hot air out, when driving small journeys it heats up
ruthlaugharne, February 2010
It could well be a faulty thermostat
Or
Blocked cooling system
What does engine water temperature gauge read - if there is one?
Would help to know Make model of vehicle

Maurice, February 2010