This spring the AC on son's 850 decided to act up. 2 years ago I had installed a rebuilt compressor and receiver dryer and all was well. This year the system acted as if it was overcharged, but would not cool. Finally we jumped or bypassed the low pressostat and the system took a charge and cooled perfectly. Purchased a new pressostat (give away item of $56 with discount) and all is well.
Have not heard much in these little guys going bad, but this may help someone on the diagnostics. BTW, parts man said low and high pressostat's are the same.
Volvo # 9171700 May be the same on S70's too.
dick
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