[W126 Coupe] Overheating

[Camran Nassiri]

Hi Jonathan- the radiator was flushed about a 1,000 miles ago in April when it was still cool.  The fan clutch appears to be working, and yes the car heats up to the line between 80 and 120 on the highway at 85 degree outside temp and goes half way up above the line between 80 and 120 when sitting at traffic light.
The radiator is the original one from the factory (1991).  What is the cost of a new radiator getting it from you and also can I get one of your1.1kohm resistors?  If you don't sell the radiator can you recommend a supplier?

Thanks,
Camran
1991 420SEL, 80 240D
 



Date: Tue, 5 Jul 2011 20:25:03 -0400
From: jhodgman at gmail.com
To: mbcoupes at mbcoupes.com
Subject: Re: [W126 Coupe] Overheating


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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