Dave,
The Bentley wiring diagrams for a 2003 show the following devices:
G2 (sensor for temp. gauge) and G62 (sensor for ECU) combined in a
4-pin device and mounted in the thermostat housing. This is the
upgraded green D-shaped device (originally black).
F163 (A/C cutout thermal switch) and F165 (3rd speed coolant fan
control thermal switch) combined in a 4-pin device and mounted in the
thermostat housing. This is the green square device.
F95 (after-run coolant pump thermal switch). The Bentley doesn't show
a location for this device.
On models WITH Climatronic (i.e., GLS and non-Weekender MV's), F95 is
shown combined with G110 (A/C engine coolant temperature sensor) into
a 4-pin device. G110 is shown in a location "behind intake manifold,
center, in coolant hose above exhaust manifold heat shield". But
maybe this device is really mounted in the thermostat housing? And
maybe the 4-pin device is installed in vehicles which aren't outfitted
Climatronic, even though one half of the device isn't actually used?
The Bentley CD isn't very helpful here.
And finally, there's FC (coolant fan control), which is a 3-pin device
shown mounted near or in the radiator and not really part of this
listing of devices in the thermostat housing, but I thought I'd list
it since it is related to coolant temperatures.
I have a 2003 Weekender. Next time I pull the belly pan, I'll have a
look at the thermostat housing to see what's there. I did replace the
black with a green D-shaped device several years ago as a preventative
measure.
Carl
--- In ev_update@..., "dave_king_ev" <dave_king_ev@...> wrote:
There is something wrong with this "good info" because it describes
all 3 sensors as 4-pin sensors, which would mean 12 pins total, and
that would mean 6 devices.
But, as far as I can tell (I have a '99 12 valve, and a paper Bentley,
but there has been a discussion on vortex -- complete with wiring
diagrams posted for the 24 valve motor -- and what I've seen is
consistent with mine) there are just 5 devices:
ECU
gage
fan
afterrun pump
AC cutout
Various models -- the 5 cylinder, the 12 valve, the 24 valve -- have
various locations and combinations for all the sensors involved (for
example on some models the ECU and gage sensors are combined in a
4-pin device while on other models the ECU sensor is a 2-pin
device) but all models use only those 5 devices, which would mean only
10 total pins.
But, Dave's information shows 3 devices with 4 pins each which is 12
pins which means 6 devices.
Something is not adding up. Does the 24 valve motor have a 6th
device? If so, what is it?
--- In ev_update@..., Sea2river@ wrote:
Good info.
And when replacing the sensor, if you replace the cap on the coolant
reservoir (after relieving any residual pressure), the amount of
coolant loss will
be less that a cup.
Bob W.
In a message dated 5/25/2008 12:33:43 P.M. Eastern Daylight Time,
davebo1896@ writes:
And the new green d-shaped (oval) sensor did the trick.
The dash gauge is now working.
Another note, I think the AC was not working while this sensor was
malfunctioning. It seems to be working now. I'm not sure if this is
related.
So to sum up ...
There are two sensors under the engine in the thermostat housing.
You'll have to drop the belly pan to get to these, they are on the
driver's side.
The 4-pin d-shaped (oval) is for the dash gauge and the fuel
injection. The new sensor is green, the original one was black. the
black ones are a known problem.
The 4-pin square sensor next to the d-shaped sensor is for the fans.
There is a 4-pin blue sensor in a hose near the top of the block that
is for the after-run pumps.
Each sensor is held in with a c-clip. Each sensor has a rubber
o-ring.
It is possible to swap out the sensors without draining the coolant
system, but you need to be quick with the lower ones (make sure the
coolant is cold, safety goggles and a closed mouth are advised)
The o-ring does not always come out when you pull the sensor. Make
sure it is accounted for before replacing the c-clip. Also be sure
the sensor is under the c-clip not over it, or it will pop out and
drain all your coolant.
Sensors and o-rings are available from Steve at
_ ()
Thanks All !!
Dave
****Get trade secrets for amazing burgers. Watch "Cooking
with
Tyler Florence" on AOL Food.
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