Silicone in reservoir
Thread Starter
Super Member
Joined: Nov 2018
Posts: 604
Likes: 16
From: Atlanta, GA
2001 S500 (W220) / 2007 GL450 (X164)
Silicone in reservoir
So my heat hasn’t been working on my 01 S500 and I took it to Tires Plus to get it checked out and they tell me I have silicone in the reservoir and there is some tech bulletin that says I have to replace the ENTIRE cooling system ($4,500)
somebody PLEASE say it ain’t so!!!
somebody PLEASE say it ain’t so!!!
Thread Starter
Super Member
Joined: Nov 2018
Posts: 604
Likes: 16
From: Atlanta, GA
2001 S500 (W220) / 2007 GL450 (X164)
Thread Starter
Super Member
Joined: Nov 2018
Posts: 604
Likes: 16
From: Atlanta, GA
2001 S500 (W220) / 2007 GL450 (X164)
I recently had the car checked out at an indy benz shop and while they said they didn't see any silicone in the fluid the fluid was dirty. They also said they didn't bleed or drain the entire system.
they said what they found is that the heater control value is sticking and that is why I am not getting heat.
They said they don't know why its sticking but they recommend that I replace it and flush the system and add a VPS additive to the system.
they said what they found is that the heater control value is sticking and that is why I am not getting heat.
They said they don't know why its sticking but they recommend that I replace it and flush the system and add a VPS additive to the system.
Thread Starter
Super Member
Joined: Nov 2018
Posts: 604
Likes: 16
From: Atlanta, GA
2001 S500 (W220) / 2007 GL450 (X164)
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MBWorld Fanatic!
Joined: Dec 2012
Posts: 2,473
Likes: 439
From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
This is a guess...
There is a "duovalve", which controls the flow of coolant to the left and right heat exchangers (heater cores), and also pumps coolant for the "residual heat" function. The duovalve is located between the two rear bulkheads in the engine compartment, under the wiper system. It is pretty common for the duovalve to get stuck. Often, you can solve duovalve problems by removing, cleaning and replacing the duovalve.
This might help.
https://www.benzworld.org/threads/so.../#post-5094753
There is a "duovalve", which controls the flow of coolant to the left and right heat exchangers (heater cores), and also pumps coolant for the "residual heat" function. The duovalve is located between the two rear bulkheads in the engine compartment, under the wiper system. It is pretty common for the duovalve to get stuck. Often, you can solve duovalve problems by removing, cleaning and replacing the duovalve.
This might help.
https://www.benzworld.org/threads/so.../#post-5094753
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