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Old 07-10-2018, 11:43 PM
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Join Date: Jan 2003
Location: Gastonia, NC
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Vacuum Pod Good. Vacuum Block Bad?

1995 E300. Everything works except the footwell flaps. When direct vacuum is applied to the pod for those flaps it works just fine. When connected to the vacuum block the pod doesnít work. Iíve hooked up my MityVac to the port for the footwell pod thereís a brief moment of vacuum (2 seconds) once the temperature dial is maxed out on heat, but it drops out. All other pods test fine with the MityVac and function fine connected to the vacuum block. All vacuum lines are hooked up correctly. The dash is currently removed from the vehicle.
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Old 07-11-2018, 07:38 AM
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Join Date: Aug 2006
Posts: 711
Open up the solenoid block and re-solder all connections to the solenoids as well as the connector socket. I have opened 5 and all had cracks causing intermittent problems. Good news is that the '95 is held together with screws so it is easy to disassemble.
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Old 07-12-2018, 05:14 PM
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Location: Gastonia, NC
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I managed to find one in the scrap yard. Works great!!!
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Old 07-13-2018, 05:33 AM
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Join Date: Aug 2006
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Even though you found a working one, it should be opened and re-soldered. Cracked solder connections are very common in this valve assembly.
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Old 07-13-2018, 10:17 PM
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Join Date: Dec 2008
Location: NE Oklahoma
Posts: 190
Interesting. Believe it or not after all my years of working on MB's I think this is the first time I have heard of resoldiering the valve block. What years/models does this apply to?
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Old 07-13-2018, 10:32 PM
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Join Date: May 2016
Location: Texas Hill Country
Posts: 4,131
I just repaired mine today. Both of the recirculate solenoids had cracks preventing continuity. The common pin had a bulls-eye around the solder pad. It was still making connection, but not for long. Repairing the solder connections had a profound impact on how well the A/C works now that the recirc flaps work properly.
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