AC VACUUM LEAK

1998 Mercedes Benz S420

Tiny

barnieguest

July, 1, 2010 AT 9:12 AM

Air Conditioning problem
1998 Mercedes Benz S420 V8 Two Wheel Drive Automatic 175000 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

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1 Answer

Tiny

2CarPros Ken

July, 12, 2010 AT 1:32 PM

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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