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Air pump running after warm up, perhaps

I will vouch for KC on this one - my 1998 also does a cray loud noise from the SAS/PAIR pump when hot from time to time. I cannot replicate it on demand and have been unable to discern any kind of pattern.

Not sure why it happens sometimes but it definitely does. I have been unable to link it to any other symptom / behaviuor either. Very strange.
--
1998 V70 AWD->FWD->AWD Turbo 215k+






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