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Heater/AC Question



On my 1988 535i, the AC does not seem to be working.  The blowing air is not cool.

With the A/C switch off, and the heater/vent blower on 1, the fan will randomly
(could be many minutes apart) surge to a high air flow for just an instant and then
slow back down.  Does anyone know what would cause this?    Appreciate any
respones.  Thanks.

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