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Discussion Starter · #1 ·
Hey everyone,
I have a 86' 560 sel and recently the radiator hose flew off and the car started to overheat, now when i reconnected the hose and put in coolant the car heats up to 110 degree. There is a sizzling noise coming from the radiator. I am replacing all hoses, radiator, thermastat, and monovalve for good measure. is there anything else i should know about? any input would be great! thanks again!



Vinny
 

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1991 300 SE
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Although you replaced some coolant lost when the hose broke you may still have air in the system. In addition to replacing the parts you mentioned make sure you replace the coolant with the proper coolant to water ratio and that the cooling system is free of air.
 

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CH4S Admin , Outstanding Contributor
1985 500SEC, 1991 190E 2.6.
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45,354 Posts
The 'sizzling noise'. To start, make sure your hose clamps are in good shape and tight. With warm engine running, check for a radiator leak, plus hoses can have small leaks(not small for long). By touching the hoses you should be able to tell if the thermostat is opening. Now I would consider venting, were it my car. But I recently learned that the 560 has a vent opening through the thermostat which has to be aligned if you install a new one. There are several good diagrams in MBL87560SEC recent postings. Make sure that the coolant you add is either MB or Zerex and don't add cold coolant to a hot engine, or you might cause damage. But If you decide to first change all hoses etc. you probably want to do a cooling system flush to get the gunk and grime out. An old time mechanic used to tell that a water and baking soda mix works great, any opinions? The 'search this forum' box should have lots of info as well. Good luck, Horst K
 
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