Like the post title states.. my lil micra is cold .. not all the time only when driving.. and out here in wales it does get quite cold at night. the problem is this. when stationary it takes around 5-10 minutes to get hot... nice n cosy but soon as i pull away within 30 seconds the heater is blowing cold and the water in the radiator is ... COLD! i drive my car pretty much all the time so im gobsmacked as to what could be going wrong.. first i thought it was the water pump.. but wouldnt my engine go bang after 10 minutes of driving? if any of you has any suggestions id appreciate the reponses im stuck on what next to do.. shes a lovely car bit high on miles just topped 100k but still drives like a dream even if its a bit noisy on a bearing...