[W126 Coupe] heat problem

[PONDERSOA at aol.com]

hi all 
 i seem to be having a heat problem  the temp gauge  seems  to creep up to 
the line before actually a little past the third mark ) this  is when i stop 
driving as i swear this is the critical meltdown  point  '
 i have replaced  the clutch  and last year changed the  thermodore 
 it was the end of air cond season so i was not able tell   if it was  fixed 
or not 
 now  it  it is creeping up to the warmer side
 
 my question is  because  i an not loosing any coolant 
 i am looking to  replace the radiator next . i see that a  company called 
nissans has a replacement unit that does not have a reinforced  neck but is made 
of fiberglass and plastic and is supposed to be 30 % stronger  than stock 
 my question is...... am i safe using the nissans unit or should i use  the 
behr unit .... because both are sold by  Rusty so i know i am dealing  with 
good stuff
 what should i do 
 
 mike collins
 1985 500 sec
phila pa  
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