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Ventilation dead

I have a theory, I suspect the 12V battery. Over the last 3 days, I hardly used the car. Normally it gets a good workout every day without exception. This morning the battery showed 12.4V but after a few more kilometers it went to 12.6V and the blowers were working fine again. Before it always showed 12.9V. Tonight I'll hook it up to my Tecmate Optimate 4 so it can recondition it and recharge to max level. The battery is 13 months old but also has 70000km of experience.

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