Re. the compressor problem, 'been trying to remember name of relay that
caused same problem on my '87 300D - a relay behind the battery. Somebody
help me remember its name. Is it overvoltage relay? Again, behind battery
on '87 300D.
'Had same prob with compressor that Dan is having with '90 350SDL. I
replaced that relay behind battery to cure prob.
Overvoltage relay on 350SDL is at rear of engine comp. inward from fuse
box. Small rectangular unit w/clear, plastic top, I think.
Wilton
----- Original Message -----
From: "Dan Penoff via Mercedes" <mercedes@okiebenz.com>
To: "Mercedes List" <mercedes@okiebenz.com>
Cc: "Dan Penoff" <dpen...@verizon.net>
Sent: Tuesday, March 08, 2016 5:12 PM
Subject: [MBZ] Type III ACC Questions
As I get the 350SDL sorted out, I'm starting to turn towards the ACC
system. It works, sort of, but has some quirks that I know are not right.
I'll be doing some research in the next couple of days to learn what I can
but I figured I would toss things out here in the hope that maybe someone
might recognize some of these and have some input. So here's what's going
on:
The good:
Fan speeds seem to be good and somewhat temperature dependent. If the temp
is set low and it's hot, you get high fan speed until things cool down,
which is what it should be doing. Same in reverse with heat.
The various modes sort of work correctly for the most part (more on this
later.). Heat comes out the floor, defrost out the top of the dash.
AC is charged and has proper pressures. Definitely gets cold.
The not so good:
Center vents are weird. They do work, but rarely. They only seem to come
on during transitions when the system is close to the desired temperature.
For example, when you want full cold, you get defroster vents, not center
vents. When the system has almost reached the desired temperature, the
center vents kick in. I think this is important to note since I realize
that the system default is defrost - the center vents do work, just not
for a lot of the time.
The aspirator fan wasn't working and the thermistor in the ceiling grille
was filthy. It has been cleaned and I have the aspirator fan working.
When the AC is run, it comes on and makes plenty of cold. But - once the
compressor cycles off the first time, it doesn't come back on until the
car is shut off. So you get cold until it cools down, then you get ambient
air - the compressor never comes back on.
The PO threw an evaporator temperature switch at the car, which they claim
fixed the problem. It doesn't appear that's the case.
So, to summarize:
Center vents are wonky
AC compressor won't cycle back on
I'm all ears, folks. I know the Gen 1 ACC system, but the later system is
a bit more complex and not something I'm familiar with.
Thanks,
Dan
Sent from my iPad
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