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When i start my car up and leave running for 5 mins, i turn the heater on and it comes out warm for a few mins then it turns cold. What could this be? i need to get it sorted as its getting colder now!!
Leave it to stand over night and before u start it in the morning check the level of the expansion bottle, if it is low then you have possibly had air in the system,in this case just simply fill the bottle to the correct level and it shud be fine.
Check it for a few mornings to make sure its not going down ,if it is then u mite have a leak and this cud be drawing air in causing your heaters not to work very well