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Volvo: 98 Volvo s70, vacuum hoses, volvo s70


Question
when i start my car everything is regular and even if i idle for a minute or two it's fine.  but when i start to drive, a louder humming or buzzing sound starts up under the hood.  it sounds like something is pumping or getting activated.  what is it?  
also, my cruise control is very sketchy-working only once in awhile.  what can i do about that?
what things should i be watchful for around 100,000 miles?
What should a professional window tinting job run on my model?
thanks for your expertise!


Answer
the noise could be a solenoid or transmission, who knows, i'm not familiar with the emission systems on 98's.  it's a great idea to check vacuum hoses with lot's of miles, maybe thats the problem with the cruise control.  but so i don't have to do a lot of typing, everything is listed in the owners manual for the 100k checks and 10k 15, 20k interval etc.