1998 Mercedes Benz S420 AC Vacuum leak

Tiny
BARNIEGUEST
  • MEMBER
  • 1998 MERCEDES BENZ S420
  • V8
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
My blower on the climate control stops when I accellerate quickly. Once I reach a constant speed it returns. I am sure I have a vacuum leak and I think it is in the ac control block. I need to know how to get to it. Help. I sent a message yesterday but could not get back in to see if I had a reply. I gave yesterday
Thursday, July 1st, 2010 AT 9:12 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,149 POSTS
Hello, it sounds like the vacuum check valve has failed and needs replacing. This valve is located at inline or at the base of the vacuum source at the engine or firewall. Note: some models feature the valve under the dash on the passenger's side foot well.
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Monday, July 12th, 2010 AT 1:32 PM

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