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I suppose your car i fittet with the ECC-system. Does the two yellow lights at the AC & REC buttons blink, when you turn on igniction. If they blink, they indicate, that there is a fault in the system, eg. fault sensor and you can read out the codes from the system. If you look op at -maintenance -850 Service Light From Bay 13, there is a picture, that shows the "A" and "B" diagnostic connectors. One of them can give you the needed information. But if the two light dosen't blink, no fault will be recorded.
Neal/94 850 turbo sports wagon.
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