Have 2000 VW Polo Gti and had radiator replaced 10 days ago and only driven twice since. Now when egnition first on the climatron aircon displays all symbols and flashes 'diagnose'. when i turn off and on again display clears but with temp set at 18 it's blowing warm air not cold. Is it something simple? any connection to radiator replacement? I am a single female, unemployed.