Blooming Clicking Noise

Any help gratefully received.

Freelander starts first time no issues, however I suddenly get a clicking noise and turning the fan up makes the clicking go faster - oh and takes radio out of action as well.

Turn off and on again (worked in IT too long) and starts no problem then half mile down road does it again.

Any ideas peps

Do you have air con?

Could be low on gas causing the TXV to "chatter"

could be a crack in one of the belts