1993 Holden Commodore heater controls

Hi there,

This is usually a vacuum leak in the bi level controls, this is in behind the lower dash and is a real pain to get to, what you will have to be very careful of is that if you are not very careful you may disconnect other vacuum hoses and then it is a real pain to sort them out, best get your local mechanic to check this out for you.

Mark (mhpautos)