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1999 E320 (140k), 1995 SL500 (72k)
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51 Posts
Discussion Starter #1
At times with closed throttle and AC on, the idle goes up to maybe 1000 for one or two seconds as compressor cycles. This can be a concern when comming up to a stop. I also notice the economy gauge (vacuum gauge) shows max vac on Heat and Econ but 1/8 on Defrost and AC. Disconnected Y7 and no change. I also get a low flow of cool air from center vent in Defrost and Heat. Are these connected? Thanks.
 

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W124 Moderator
86 190E 2.3L 16V, 2 95 320TE's, 02 S500
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12,746 Posts
You have a vacuum leak someplace in the system. Start checking every line and every rubber connection. Don't overlook the vacuum line cluster just behind your power brake booster.

Good Luck,

Jayare
 
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