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Old 02-05-2009, 08:44 PM
kerry kerry is offline
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Join Date: Jan 2002
Posts: 18,350
I believe the vacuum control switch on the the blower is strictly on/off. Not enough vacuum and blower won't work. I don't think it could cause less than full blow.
I'd have to carry out a test to be sure, but my recollection is that the HI setting is not as high as defrost. (I may be wrong).
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1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
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