It's now three weeks since I flushed the entire system, replace the filter, installed the Wurth (Super A/C Leak stop with U/V Dy, Article No. 1892764322)
and the centre vent Temperature is still on 5-7 deg Celsius. Looking good so far
will keep you posted.

Website to find the product, log on & go to catalog.
www.wurth.com.au