This is a a major headache, I to have the problem with the instrumentation bulbs having blown for the heaters. Having looked in the Haynes manual, it would appear that the only way of changing the bulbs is to strip the interior consell down. If you can live with them not working then leave it as is, however I think for an MOT you will need to rectify the main beam indication light.
Poor design by Vauxhall, in my opinion.
Mike
October 2004
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