HELP HEATER/CLIMATE CONTROL UNIT

mike-turbo

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Hi i have a 03 s3 8l and the heater unit display is not working i've checked the fuse and thats ok when i switch the headlights on the unit lights up but the screen not coming on any ideas the aircon high pressure switch went and i've now replaced i just need to have it regassed.but i can't get my heater or rear screen heater to come on .
 
ive just put a new climate control unit in and still the same problem?no display any relays?that control it?