i presume this is because the header is ‘trying’ to do something with the disc but is unable to, thus, using more power and creating more heat. the radio/phone etc is ok, but after a longish run the system is overheating and comes up with various messages such as ‘volume reduced due to overheat/system will shut down/telephone stopped working’ etc. Hello there, i’m hoping you can help….i have a 53 plate 2004 307 sw with the rt3 head, 5 disc changer and full colour screen….the changer accepts discs but won’t play anything, the head unit works fine apart from it won’t pull a disc in so won’t play a disc.