AIR-CON, CONTROL UNIT FINE, RE-CHARGED SYSTEM BUT...

Hi Folks, probably a familiar topic to some...
Climate control unit began faultering, although when it worked, air-con worked fine. eventually, climate control packed up entirely although one of the pipes under bonnet near bulk-head was still freezing over sometimes... but system not blowing through. Just had climate control unit repaired, so while that was out I had the expected full-on hot air.
Control unit all seems to work plus had air-con system recharged, everything sounds and feels like it's all working except for most crucial aspect... no chilled air at all now.
Any ideas anyone?
Climate control unit began faultering, although when it worked, air-con worked fine. eventually, climate control packed up entirely although one of the pipes under bonnet near bulk-head was still freezing over sometimes... but system not blowing through. Just had climate control unit repaired, so while that was out I had the expected full-on hot air.
Control unit all seems to work plus had air-con system recharged, everything sounds and feels like it's all working except for most crucial aspect... no chilled air at all now.
Any ideas anyone?