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Larry, funny you mention the high side pressure. Just had the 300SD in the shop yesterday and Donnie mentioned that the high side pressure was slightly elevated. Said it could indicate a bad expansion valve or failing compressor.
I have no idea about these things and I don't understand how an elevated high side pressure would mean that the fan needs to come on. I thought that anytime the A/C was on PERIOD the aux fan came on.
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Chris
1985 300SD - 'Grace' (198K mi.)
2018 Honda Civic Sport
2018 Honda CRV LX
2010 Honda Fit Sport (RIP)
2013 Honda Accord Sport (Sold)
1996 Lexus LS400 (Retired)
1995 Ford Contour SE (Retired)
1976 Porsche 914 (Sold)
1972 Datsun 240Z (RIP)
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