the GP light is an indication that you have GPs. They are not related
to mileage. Beru have the reputation to last longer, but that is no
guarantee.
Dan Penoff via Mercedes <mailto:mercedes@okiebenz.com>
March 21, 2017 at 4:55 PM
The 350SDL started acting weird this morning….
No glow plug light when I went to start it up, or if it did come on it
was only for a few seconds and I missed it. Ambient was maybe 50F,
possibly a little warmer. About 5-10 minutes later as I’m driving down
the street, the glow plug light comes on and stays on for a short
time, then goes off.
Weird.
At lunch I went out and the light lit for maybe 5-10 seconds and went
out. Again, it came on while I was driving a few minutes later for a
short time and then went out.
Same thing on the drive home today.
As I look at the service manual, it says that one of the fault
indicators is no preglow lamp at startup, then the light can light up
for approximately one minute while driving. Fault: One or more glow
plugs defective.
So I’m wondering if I’ve got a bad glow plug. I just swapped them all
out less than 10k ago, probably even less than that.
But - there’s more…
The AC started acting up. Hot air, literally HOT air coming out of the
vents. I checked the monovalve, it’s good. Checked the AC system,
everything is good there as far as pressures and charge, but the low
pressure line is not cold. High pressure is.
I put a clamp on the coolant line to the cabin to isolate the heater
and drove the car. I can get duct temps down to about 70F and that’s
it. Pressures are correct for the ambient temperature and humidity.
It’s almost like I was getting heat during cooling, but I’m not
getting decent output from the system to begin with.
Both of these issues started at the same time. I can’t see how they’re
related.
???
-D
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