AC
Evaporator Removal &Replacement (Range Rover P38/4.0/4.6)

Introduction
Diagnosis
Parts Needed
Strategy for Accessing the Evaporator
Dismantling Tips
Re-Assembly
More Information & Related Operations
Introduction
The climate control system in the 4.0/4.6 models is a considerable
improvement over that in the Classic, but like any A/C system it will
eventually get worn out and develop leaks. Scott Kirn had this happen
to his 1995 4.0SE, and the leak appeared to be coming from the
evaporator area. Scott kindly submitted the following report on the
process of removing and replacing the evaporator, to help others with
the same problem.
Photo: Bad
evaporator after removal from vehicle
Diagnosis
Scott's AC system was not holding a charge. The last time he had it
recharged, his local shop put a leak detector in the refrigerant, that
when viewed with a special light, allowed them
to see
where the refrigerant was leaking. When it ran out again (after two
days), the special light was used to find the leak. If you put the
light up behind the glove compartment, you could see the leak detector
glowing there, right where the evap sensor is mounted in the heater
unit. Since there is no reason for Freon to be swirling within the
housing on its own, this meant that most likely the evaporator itself
was
leaking within the housing.
Parts Needed
Scott purchased a used evaporator from Roverland Parts (www.roverlandparts.com) for
$150. At
the time of this writing, a new evaporator is about $600.
Preferably, you should also replace the 20 wheel liner clips (part#
ANR2224) as these plastic items are weakened by removal. I have removed
and replaced my wheel liners during other operations and re-used the
old clips, but found that the sagging of the old clips caused some
rubbing on the wheel liners.
Overall Strategy for Accessing the
Evaporator
Unfortunately, the AC evaporator is
located within the
heater unit, which is located behind the middle of the dash, which can
only be
accessed by removing the entire dash (or fascia) assembly (see photo
below). Some of this process is also outlined on the fascia panel removal page, which describes
replacement of the fascia trim panel when it is warped. However,
replacing the evaporator requires considerably more dismantling, ending
up with everything removed from the front of the interior (see photo
below). Scott found the entire operation took him about 12 hours for
removal and 10 for reassembly. With the help of Scott's tips and
instructions below, your time should be less!
To
remove the entire dash, the manual has you backtrack four or five steps
before you
even get to
the evaporator removal. Scott has kindly summarized those steps and put
them in
their
correct order to facilitate searching through the manual. The following
major
components need to be removed, and in this order:
- Electric window switch pack
- Center console
- Steering column intermediate shaft
- Steering column
- Windscreen side and lower finishers
- Plenum Air Intake Panels
- Wiper motor and linkage (only a couple
of parts, not the motor itself.)
- Fascia assembly
- Heater unit
- Evaporator
In removing these components, you
have the option
to take
advantage of access previously hard to reach components, and
preemptively
replacing them now to ensure many years of trouble-free service. The
access you
have to these components is nothing short of amazing. Here is a list of
components that you may consider replacing during this project:
- Heater temperature sensor
- Heater o-rings (highly recommended)
- Blend and Distribution motors
- Evaporator sensor
- Ambient Temperature sensor
- Approximately 20 wheel well liner
clips - Part# ANR2224 (mandatory)
Dismantling Tips
Scott offers the following illustrations and
hints to ease the dismantling process. The descriptions assume a RHD
NAS model Range Rover with 2 point SRS; however most of the procedures
apply to other models.
Electric Window Switch Pack
This is pretty straightforward
and detailed well
in the
manual.
Center Console
I found it easier to remove the side
panels by
applying a
sudden, strong downward force to disengage the sprag clips. This part
is pretty
durable, so I wouldn’t be concerned breaking anything. The only other
note I
have here is that on my ’95, I only had one screw securing the selector
lever.
Steering
Column Intermediate Shaft
First, make sure your wheels are
pointed straight
ahead.
This will allow the bolts to be accessed much easier. Also, I found
that
removing the wheel well liners here make access much easier. I used a
crowbar
to remove the wheel well liner clips. You will need to replace these.
Soak the
lower
universal joint and splines with penetrating oil of some sort to ease
in
removal. I could not slide the universal joint up the splines as the
manual
suggested, mostly because I could not get enough leverage to apply the
force
needed. I ended up moving on to the next step of removing the steering
column,
which then allowed the intermediate shaft to be removed. If you do move
on, I
would recommend tying up the intermediate shaft so it doesn’t fall once
you
remove the steering column.
Steering Column
You will need a small Torx wrench to
remove the
wiper
components. Other than that, this part was pretty straightforward. Make
sure
you pull the steering column straight out and do not turn the steering
wheel.
If you haven’t already removed your intermediate shaft, you should hear
it drop
at this point.
Windscreen Side and Lower Finishers
Again, this part was
straightforward. The scariest
part was
removing the lower windscreen finisher, since it is held in by plastic
clips
and takes some force to disengage. Get your fingers right next to each
clip before
pulling upwards and you should be fine (see photo below).

Plenum
Air Intake
Panels
The only discrepancy I found here
is that my
driver’s side
panel had a ground wire going through the grommet, which prevented me
from
removing the panel altogether. But I found that these panels do not
need to be
removed, and instead can just be moved aside.
Wiper Motor and
Linkage
I listed this as a step, but found I
didn’t need
to remove
the motor or linkage at all! Just removing the scuttle side panels gave
me the
access I needed for the following steps.
Fascia
Assembly
Here is the fun part. None of the steps are
particularly difficult;
there are just a lot of them! Step 22 mentions removing some BeCM
multiplugs.
You may find the rear multiplug difficult to access. If so, use a Torx
wrench
to remove or at least tilt the passenger seat. (Hint: you will probably
find
yourself doing the same for the driver’s seat later on, so you might as
well do
it now.) You then pull these wiring harnesses out from under the trim
molding.
Step 27 mentions removing the SRS multiplugs. This is located directly
under
where the cubby box would be, probably hidden by the carpet (see photo
below). There is a weird part
on the red connecter that you slide out, which
allows the
multiplug to be removed from the box.

The SRS crash sensors are located under the air
dryer unit
and the battery box respectively. Follow the yellow wiring harness to
locate
them. You then pull these sensors back through the wheel wells and into
the
cabin. This was not hard at all.
Finally, step 40 mentions removing the 4 tube
bolts. I
actually had 5 tube bolts, with the 5th being located
directly
behind the steering column. I removed it only to find that it wasn’t
attached
to the fascia at all. I do not know what it attached to.
Step 44 mentions removing the rubber seals from
the air
intake ducts. This is where the pollen filters were. Just reach inside
and
unseat the lip of the seals from the fascia, then they pull right out.
After removing the last couple of bolts, the
fascia is ready
to be removed from the vehicle. I would recommend moving the gearshift
lever as
far back as it can go to give you room to maneuver the fascia. However,
since
you have no power to the vehicle, the solenoid interlock will not allow
the
gearshift to move. You will need to push the interlock mechanism
manually with
a screwdriver. Check out “Selector Lever Assembly” in the manual on how
to do
this, but basically you just push aside the piece of metal locking the
gearshift in place. I would also recommend removing the bolts securing
the
drivers seat and tilting it all the way back.
Removing the Fascia
The manual
recommends a second person helping you
remove the
fascia, and I would agree. It is somewhat heavy, but generally very
awkward.
Pull the fascia away from the windshield so that the 4 bolts clear the
holes in
body. Then just maneuver the fascia out of the driver’s side door the
best you
can. Rest it on a table right side up, just as it is in the truck. You
should
be able to rest it directly on the 4 metal supports. The hard part is
over now (see photo below, which is a view of the back of the entire
dash once it is remoced from the vehicle).

Heater Unit
I found that removing the nuts securing
the
passenger and
driver’s side blower motor allows you to disengage the ductwork much
easier.
You don’t need to remove the motors, just the nuts so you can move the
motors
aside. Have someone hold the fascia when you pull the heater unit out.
The
heater unit is not heavy (see photo below).

Evaporator
The manual tells you how to remove the evaporator
housing,
but not how to access the evaporator itself. To access the evaporator,
you need
to remove 2 screws securing the two housing halves together. Then use a
screwdriver to pry off the many, many gold clips. Pull the two housing
halves
apart, and you are staring at the evaporator.
In my case, I could see a lot of
leak detector
residue on
one corner of the evaporator, which must have been the problem (see
photo below).
I also noticed that my
passenger side
drain tube was clogged, even though I clear them out regularly from
underneath
vehicle. My theory is that this caused the water to back up slightly in
one
corner of the housing, resulting in the evaporator essentially sitting
in water
more often than it should. This may have caused it to fail prematurely.

Re-Assembly
Just as the manual says, reassembly
consists of
reversing
your steps. However, I took this opportunity to do a do a few things
which may
help re-assembly. The first step recommends taping the rubber seals to
the
blower ducts. I used some weather-stripping adhesive to hold the rubber
seals
to the lip of the ducts, and then folded the rubber seals inside the
duct,
using tape to hold it in place (see photo below). I also taped
the wiring harness and SRS wiring
together and then taped it down on top of the dash to keep it out of
the way.

Moving the fascia back inside the
vehicle is
awkward, but
not impossible. A third person would really help in aligning the heater
and
evaporator pipes through the firewall while the other two people do the
lifting. I found that the metal bracing by the steering column kept
getting
caught when trying to fit the fascia in place, so this is a place to
keep an
eye on. Once you fit the bolts through the fascia, you are home free.
When replacing the lower windscreen finisher, I
found it
easiest to snap in one clip, then use a screwdriver or something
similar to
align all the other plastic clips with their holes before seating the
rest of
the finisher. This minimizes the amount of bending you need to do to
see under
the finisher (see photo below).
When refitting the steering column intermediate
shaft, I
would recommend cleaning the splines which will help in reassembly.
Also, I found
that I had much better access to the intermediate shaft and the
universal joint
that connects the shaft to the steering column by accessing it from
under the
vehicle.
The rest of the reassembly process is pretty
straightforward, if not a bit tedious. The manual does help, as long as
you
follow the steps closely and in order.
More Information and Related Operations
See also the page on Fascia Top Panel Removal and Replacement.
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