[20v] '91 Coupe Overhaul - Question #1

too many quattros thequattroking at yahoo.com
Fri Dec 14 21:38:55 PST 2007

hey all-

i have a friend that has a cq. i have a cq.  his is a 1990 so is mine.  he
has owned his for about 5 years.  right after he bought it, he converted it
to pink pentosin coolant.  i bought mine 7 years ago and did the same.  I
have NEVER had a leak.  he has had too many to count.  recently, he took it
into 2Bennett for service.  One of the brothers told him they discovered the
blue stuff is a higher viscosity then the pink...hence the probs with the
leaks (on most rights 1990 and older).  i don't think he has converted back
yet.  anyone know if there is truth to this?


PARTING:  1972 Mercedes Benz 280 SE 4.5
PARTING:  1986 Audi 4000 CS quattro

> Got a pretty good coolant leak at the water temp sender; more
> specifically, through the water temp sender.  It will need to be
> replaced.  I notice that all the new senders (at least the Vemo ones)
> have 3 terminal plugs whereas the old sender has a 4 terminal
> plug.  Looking at a picture of the new sender, it appears to be
> missing the lower left terminal (with the alignment key
> downward).  Looking in the manual, that would appear to be the "+
> from terminal 15a".
> Can the 3 terminal sender be used effectively?  Is any functionality
> lost (over-temp alert or A/C cutoff)?
> Thanks in advance.

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