Mercedes Benz repair: 1992 400E no water pressure, number search results, mercedes benz 400e

Question
my 400e was running hot when sitting still in the summer, just thought it was normal, now it is not get hot the gauge is down below the 80 near the 60 or 70. When i check the level all is fine no leaks, but i can take the cap  off and there is no pressure at any temp.

Answer
Answer:
If you are not adding coolant, there is no leak.
A cooling system pressure test will locate most common leaks.

From your description I would replace the thermostat and Expansion Tank Cap, before any further testing/diagnosis.



Vehicle: 1992 Mercedes Benz 400E
Part: Thermostat Kit
Select one of the products from below  
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   Thermostat Kit
80 degree
  Engine: -12-020771
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   Thermostat Kit
80 degree
  Engine: 12-020772-

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=merc...


PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1992 Mercedes Benz 400E
Part: Expansion Tank Cap
 Note:  1.4 Bar
G1040-30351 Expansion Tank Cap Germany IN STOCK $7.56  

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=merc...