Has anybody else had any problems with their astra starting when the weather is hot or cold? My car struggles to start when its very hot or very cold and something seems to be draining the battery life as I need to replace the battery every year. I have taken it to the garage a couple of times including the vauxhall dealer garage to have checked over and they cannot find anything wrong even when I have had a diaganosis test done. Once I replace the battery I have no problems at all for about 5 months then the starting problem starts again. Apart from changing the car I dont know what else to do. Any suggestions?