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Message: <blockquote data-quote="JasonLawrance" data-source="post: 2652092" data-attributes="member: 897552"><p>I have a old type Nissan Micra, and when i put the heaters on they just blow cold air out, even after 45 minutes of driving the car the air vents are letting cold/ sort of warm air, im 100% sure it should be letting out more heat than it is,  does anyone know what the problem could be?  (My car engine/ radiator ect is all working, there no cracks or leaks)</p></blockquote><p></p>