Hello in the round together….I hope you can continue to help me or give me useful infos? I ran my 986 s warm and during that because of various phone calls it completely forgot that I let the box run. When I then noticed, I immediately got out to make this out,at the same time I noticed that the temperature went up and down and the heating remained cold / ran and the engine,so high and down went,shit!!!!! I then got the car from gemac ht ….then after about 20 min. I wanted to turn it on again,at the same time I noticed that all function lights became darker during the turn on and also the car didn’t really start – as if the battaria was defective?!! Then I bridged and then he went on, then I drove a round however during the 15km drive the heating was not warm and the temperature rose up to the last high so that I put the boxter off. he then went no more on-as if the battery was empty???! Well, I then charged the battery and used the week, he then went on but the engine then went in the stand gas always high un lightly down, as also the function lights were slightly brighter and darker?Heating of course remain cold in the min? Does anyone have any idea what it could be? Please ask for meaningful infos….Thank you so much to all helping!! PS:Can it be the cylinder head/seat,or the battery-to-be ndkerzen? What is doing from me? Help Bittte!!! Thank you