1995 s420 overheating
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Newbie
Joined: May 2015
Posts: 3
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From: Puerto Plata, Dominican Republic
1995 s420
1995 s420 overheating
hi, help please, my 1995 s420 is overheating, electric and mechanic fans working properly fan clutch is good, I replaced water pump, thermostat, duo valve, flushed and cleaned radiator, still overheats.
when air condition is off there is no problem, also mid vents don't put out air, and no hot air when running heater... is there an auxiliary water pump and if so where is located?
thanks
when air condition is off there is no problem, also mid vents don't put out air, and no hot air when running heater... is there an auxiliary water pump and if so where is located?
thanks
Senior Member
Joined: Mar 2015
Posts: 390
Likes: 26
From: USA
Mercedes-Benz 2007 S550, 2012 S550 4-Matic, 2014 S550 (Traded), 2015 GL450
Did you make sure that you got all the air to escape out of the radiator and the entire coolant lines? When my mechanic replaced the coolant, he ran the engine with the cap off the coolant expansion tank to make sure all the air went out. Check that first.
Senior Member
Joined: Mar 2015
Posts: 390
Likes: 26
From: USA
Mercedes-Benz 2007 S550, 2012 S550 4-Matic, 2014 S550 (Traded), 2015 GL450
You have...
1) New water pump
2) New thermostat
3) New duo valve
4) New radiator coolant fluid
5) No air pockets in system
Interesting that you have no hot air even though duo valve was replaced. Are you sure the twin auxiliary electrical fans on the radiator is working? Sometimes people mistake the radiator fan operation with the engine fan. Could be the relay for the electrical coolant fans.
Otherwise check the engine coolant temp sensor. It is a cheap enough replacement.
1) New water pump
2) New thermostat
3) New duo valve
4) New radiator coolant fluid
5) No air pockets in system
Interesting that you have no hot air even though duo valve was replaced. Are you sure the twin auxiliary electrical fans on the radiator is working? Sometimes people mistake the radiator fan operation with the engine fan. Could be the relay for the electrical coolant fans.
Otherwise check the engine coolant temp sensor. It is a cheap enough replacement.
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