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how can i improve cooling for m119 in middle east

motor gear head

E420
Member
hi i own a W124 E420 japan spec 1995 Amg . it tends to over heat alot even sometimes in winter.To solve this issue and to enjoy the car. i need a seprate oil cooler and water cooler and trans oil cooler.i want to know with a diagram how can i separate it from the big radiator in the respected lines.one more think i want to know which to use thank you.
 
What temperature do you consider "overheating"?

Normal operating temps are 80°-100°C. In cool winter temps it might stay below 90°C. In extreme summer temps you might see up to 105°C, if the cooling system is working normally. Hotter than that, something is wrong (most likely culprits are fan clutch, thermostat, or radiator).

A separate engine oil cooler and/or transmission oil cooler should not be necessary to keep a 4.2L engine under ~105°C.
 
in my place its get its up to 50c in middle east really hot. about fan clutch its good. the radiator im pretty sure its good. i just need more cooling
 
120C is WAY too hot. Something is wrong and you'll need to fix it. Some basics:

  • Pressure-test cooling system to at least 1.2 bar, verify there are no leaks
  • Verify the fan clutch is engaged and fan is roaring when engine temp is 105C or above (easier to test in summer)
  • Verify the catalytic converter is not plugged, this will cause rapid overheating
  • Verify coolant level is normal (when cold, should be at the seam on the plastic tank)
  • Make sure both the radiator fins AND condenser fins are clean (remove radiator, blow out both with compressed air)
  • Install a new OE thermostat (if not already new OE)
  • Install a new radiator if it is old or original
  • Check coolant for exhaust gasses which could indicate a failing head gasket
  • View live data to verify fuel mixture is normal (MAF readings, O2 readings, duty cycle, etc)
  • After all the above with no improvement, maybe replace the water pump as a gamble (OE only)

Also read through this thread:

 
You need a complete SDS setup with computer, multiplexer, and 38-pin cable which has all 38 wires inside. Typical cost in USA is about $750 USD... not cheap. More info here:

 

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