heating query on vs climate control

[Statey777]

I turned the heat up on the climate control the other night and it didnt get hot until i turned it to H(hot)
then it was hot enough.i turned it down to 30 then 28 thinking i would still be getting sufficient heat but it didnt seem so. as i figuered it that would be equivelant of having the dial style on at least 3/4 which gives hot on a normal commodore.
so wondering if there is an issue with my control module maybe or maybe thats just how it is.................
i have replaced thermostat,all hoses and heater tap as they were worn or leaking.
any light on this subject would be appreciated cheers

[The1]

there's a vacuum box behind where the radio sits in the dash, the box may need replacing or there might just be a hose loose, only fully engages with full vacuum being at H position.

[petroz calais]

mine dosent even work at all cant get heat at all

[BlackVXGTS]

Check the heater water valve to make sure it's not blocked and working properly.

[Statey777]

yeh i replaced the heater tap i will have to look into this box situation thing and check the hoses.