[W126 Coupe] Blower motor issues

[Josh Allen]

btb management wrote:

> My 1985 SEC has had a clicking noise when I run the A/C.  Just

> installed a new blower motor but the problem persists.  Also hear

> a gurgling sound which is boiling anti-freeze in the overflow tank.

> Changed out the thermastate and temp gauge but still persists.

> Any thoughts guys?

> _________________________________________________________________

>   


If your coolant is boiling, have you checked that the pressure cap on 
the coolant reservoir is sealing and holding pressure?
If you haven't had the system sniffed for exhaust gasses yet, you can 
probably get the same shop to pressure test the cap.  If you don't have 
a shop that can test it, they are reasonably cheap to replace as 
preventative maintenance.

If the cap is not holding pressure, your cooling system will be much 
less effective at transferring heat.  I'm not sure of the exact ratio, 
but for each pound of pressure above ambient, the boiling temperature of 
the coolant goes up by around 5 degrees Fahrenheit

-Josh.