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    Vacuum on vacuum

    Holden Holden Advice Holden Calais Holden Calais Advice Holden Calais 1998
    I HAVE a 1998 VT Calais Commodore with climate control. When I use the airconditioning with the air to my face, I find that under load, like going uphill or while towing, the air is redirected to the screen until the load is removed. I think the vacuum is not sufficient to keep the air direction on to my face and when the load is removed the vacuum is restored. I have rung GMH and the local dealer without satisfaction. Is this an idiosyncrasy of climate control or do you think I have a genuine fault?
    Answered by CarsGuide
    31 March 2005
    Graham Smith

    OUR aircon expert, Mark Lynch of Carcool Airconditioning, says your problem is caused by a faulty vacuum switching module, which is a common failure for a VT. Unfortunately, Mark says you will have trouble finding a new module and that fitting a module from a VX or later model requires lots of work because its a six-switch module that requires a modified vacuum loom, whereas the original was a five-switch module that is no longer available from GM. Mark says the best option is a second-hand one.

    Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.
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