I have a Vouxhall Omega M reg 2.5 V6 cdx.
I have a dual heating controls which blow luke warm air even when it is on hot. I also hear a hissing (vacume controls air leaking) inside the dashboard behind the heater controls.
I have checked all vacume pipes and they are connected.
I have flushed the water system and checked the heater matrix...its not blocked.
Has anyone had this problem???? please help
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