as the weather has taken a turn for the worst just happened to noticed today heaters werent getting anywhere near as hot as they should.

i have a GSi with the dual zone climate control, all fan speeds are working correctly so its not the resistor pack, just the temperature, the cooling system is all bled ok and both matrix pipes are getting red hot under the bonnet but just not hot enough inside,

any ideas? or is it possibly just all in my mind?