2007 GL 450 sound in hood, car shut off
Every 10 seconds.
Like something is engaging and stops.
Need help.
Assuming will drain battery.
Last edited by abtabor6; Oct 11, 2017 at 09:21 PM.




What are the relays?
Thanks for jumping in.




the valve air block or VAB wants to engage about every 10 seconds when car is turned off.
thus draining my battery and killed it.
is it possible to unplug the VAB when car is not running?
I see there is a power cord that plugs in but i want to know if I can safely unplug when car is off.
oterwise. I have to disconnect battery every time I stop. To the left of the light with red cable is the plug to VAB.
Indy Mercedes wants $600, dealership almost $1k.
i found valve air block new for $250 with lifetime warranty and a local mechanic will install for $180.
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found it! Fuse box in tail gate right tail light fuse 32. This will be much easier than disconnecting off my negative cable of battery that is under passenger seat.
I will get the thisfixed, I found the part by Miessler, lifetime warranty, for $200.00.



