https://mbworld.org/forums/ 1982-1993: 190E 2.3, 190E 2.6, 190E 2.3-16, 190E 2.5-16, 190 D 2.2, 190 D 2.5, 190 D 2.5 TURBO, 190E 2.5-16 Evolution I, 190E 2.5-16 Evolution II en Tue, 19 May 2026 06:41:24 GMT vBulletin 60 https://mbworld.org/forums/images/misc/rss.jpg https://mbworld.org/forums/ https://mbworld.org/forums/190e-w201/927335-man.html Sat, 09 May 2026 23:25:41 GMT Hello. I am experiencing the dreaded heater always blowing through the side vent problem. Clearly, I have a vacuum leak somewhere in the system. After researching past threads, I read that I... Hello.

I am experiencing the dreaded heater always blowing through the side vent problem. Clearly, I have a vacuum leak somewhere in the system.
After researching past threads, I read that I could manually close the heater valve to alleviate myself of this issue. I did exactly that by engaging the vacuum plunger so that the valve closed and then capped the vacuum to seal it in the closed position.
The heat still blows
Am I fundamentally misunderstanding how the system works, or is there a better way to accomplish this?
Thanks in advance. I appreciate the assistance.

Bart


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