Hi, this is my first post, I purchased my CX5 2.2lt sport nav manual 2013 in May this year with 96,000 on clock, have now done 6000 mls with car I use it mainly to tow my caravan 1500kg. My problem is now the weather is a tad cooler the heater does not seem to get very hot, have flushed system twice and have a slight improvement. Is there some special flush Mazda use to clean system. Any help would be grateful. At my age (75) I do not look forward to removing heater matrix but if needs must will do. I am a retired and tired mechanic but there may be new things on the market I have not heard of. Mike Pearce.