I wondered about the fluid as well.  I’ll have it tested tomorrow. It is the 
right color but I don’t remember if I have ever changed it in this car.  The 
odd thing is that I did not see this build up 2 weeks earlier when I had the 
part out to check for holes in the diaphragm.    

Michael E. Esh


> On Feb 1, 2018, at 10:33 PM, Curley McLain via Mercedes 
> <mercedes@okiebenz.com> wrote:
> 
> Cooper sulfate.  Corrosion from copper or brass.  Do you have good Go5 in the 
> radiator at the proper ratio?
> 
>> Michael Esh via Mercedes <mailto:mercedes@okiebenz.com>
>> February 1, 2018 at 5:04 PM
>> I just replaced the damaged mono valve on the car. The one I just took out 
>> has a blue/green crusty substance all over the screen and any metal part. 
>> This is new in the last week. This stuff was not there a week ago. What 
>> would cause this? The only change was putting a valve in with poorly 
>> soldered solenoid. I pulled it apart last week and ruined the connections.
>> The latest symptoms are good heat at below 2000 RPM’s but then heat would 
>> cut out completely at any thing over 2000. Fan would stay on just heat out 
>> the vents.
>> I’ll test out the new monovave assembly I received from Andrew tomorrow 
>> morning.
>> 
>> Mike
>> 
>> 
>> Michael E. Esh
> 
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