[W126 Coupe] Overheating

[Jonathan Hodgman]

When was coolant flushed last?  How old is the radiator?  Is the system 
holding pressure?

What shape is your fan clutch in?  Does the car over heat on the highway 
or @ traffic lights?

If rad is old, replace it, new t-stat (whalers are best, I like to drill 
an extra hole to help bleed mine) flush out All the old coolant..  if 
you see much scale in there you'll want to citric acid flush the entire 
cooling system.

Re-fill w/ a 40/60 coolant/water mix.  Add 2 bottles of Redline Water 
Wetter as well as a 1.1kohm resistor across the two pole aux fan temp 
sensor.

Jonathan



On 7/5/2011 6:13 PM, Camran Nassiri wrote:

> My 1991 420SEL with 147,000 miles is overheating at about 89 degree 

> outside temp.  I checked the auxiliary fan and it is working.  Would a 

> new radiator solve the problem?  If not, any other ideas?  The 

> synthetic oil has been changed every 5,000 miles and recently replaced 

> ant-freeze and flushed the radiator.

>

> Thanks,

> Camran

> 91 420SEL, 80 240D

>

>

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