I saw that and the OE tstat I put in is made in Germany so we clearly did not 
put in junk. The cathey trick is definitely worth trying though. 

Sent from my iPhone

> On Feb 21, 2015, at 8:18 AM, Curt Raymond via Mercedes 
> <mercedes@okiebenz.com> wrote:
> 
> The thermostat I put in was marked "Made in France"
> -Curt
> 
>      From: Curly McLain via Mercedes <mercedes@okiebenz.com>
> To: Mercedes Discussion List <mercedes@okiebenz.com> 
> Sent: Friday, February 20, 2015 7:22 PM
> Subject: Re: [MBZ] Overheating 240D more info
> 
>> I think the key point is that the coolant doesn't seem to be circulating.
>> If you don't have hot water in the top of the radiator when the engine is
>> hot, you don't have circulation.  Without circulation, you will overheat.
>> So either (1) there is an obstruction, (2) the water pump isn't working, (3)
>> the thermostat isn't working, or (4) there is enough air in the system
>> (doesn't take much) that the water pump can't overcome the head pressure.
>> In terms of simple, I'd start with a thermostat that's jammed in the full
>> open position to rule out that possibility.
> 
> 
> Both Curt and Dimitri have avoided that simple test (blocked open 
> thermo) like the plague, insisting that 3 thermostats can't all be 
> bad, but experience shows  3 bad thermostats in a row is indeed a 
> possibility.
> 10-12 years ago 4 bad out of 5 was not unusual.  Common, in fact. 
> Then they got some better, but in the past few years, all production 
> is in 3rd world countries, so buying MB or Bosch is no longer a sign 
> of quality.
>   It makes no sense to me to avoid a simple test that will yield a 
> definitive answer.
> 
> 
> 
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