on a 1994 E320 wagon, i get see THIS [huge pict]at the end of everyday. car isnt overheating, or otherwise acting up. whats going on? it cant be normal.

also, what are those electrical connections on the waterpump? my 94 E420 dosent have them.

If so, it has lost a lot of its resiliency and there are probably pockets of air or vapor that condense when cooling creating a vacuum and causing the hose to collapse.

I think the connections are for various temperature sensors (probably the dash gauge and A/C switches) but have you tried (when the system is -COMPLETELY COOL-, of course!!!), removing the expansion tank cap? The cap is supposed to allow "vacuum" in as well as pressure out. Maybe it's not working.

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86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm

Your coolant cap is not allowing air back into the cooling system and probably needs to be replaced.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

Sensors:
Single wire -temp gauge sender
Blue 2 wire - aux fan high speed
Lower sensor - HFM/SFI coolant temp sensor
One on the side of block- cam position sensor

thanks for the quick replies. the reservoir cap was my first thought as well. lets hope its that simple.

Mine does that to a more minor degree on my '95 diesel. Mechanic told me it was normal.

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- Brian


1989 500SEL Euro
1966 250SE Cabriolet
1958 BMW Isetta 600

As stated previous to my post, your expansion tank cap is bad.

From personal experience, I've learned this is one item to buy from an MB dealer. I've had all sort of problems with the ones sold anywhere else.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"