SERVICE BULLETIN
SB2276
ADDRESSEES

: Owners and operators of coaches listed under “Application”
ABC Customer Care and Parts Source

VEHICLE MODEL

: CX45 MY 2023

MANUAL SECTION

: 8.14 Climate control – refrigerant system

BULLETIN TYPE

: Field change campaign

DATE

: April 24th, 2023

SUBJECT

: Incorrect position of high-pressure switch and test
connection on refrigerant compressor discharge
service valve

TERMS & CONDITIONS

: Refer to the warranty section further in this Bulletin.

APPLICATION:
Model
CX45 MY2023

VIN
81819→81820, 81976 , 84001→84050

DESCRIPTION:
• Van Hool has determined that the position of the high-pressure switch and the test connection
on the refrigerant compressor discharge service valve has been incorrectly placed during the
assembly process. The result is that the high-pressure protection system of the refrigerant
circuit is not working when the discharge valve is in its normal running position (refer to figure 3
for service valve positions).
• To address this issue, Van Hool is conducting a field change program, the terms and conditions
of which are explained further on under “Warranty”.
• Owners and operators of the affected units should first check the position of the high-pressure
switch and, if necessary, modify the placement.
Test
connection

High-pressure
switch

Correct position of
test connection

Correct position of
test connection

Protection cap of
service valve stem

Figure 1: Incorrect position of high-pressure
switch and test connection on refrigerant
compressor discharge service valve

Figure 2: Correct position of high-pressure
switch and test connection on refrigerant
compressor discharge service valve

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SERVICE VALVE POSITIONS:
A service valve has three positions.
Number in
figure 3
1

2
3

Position

Result

Valve stem rotated anti-clockwise as
far as possible. This is the normal
running position.
Valve stem in the mid-position. This is
the test position.
Valve stem rotated clockwise as far as
possible.

The valve is open, but the service port
is isolated from the refrigerant circuit.

MATERIAL:

The valve is open, and the service
port to the refrigerant circuit is open.
The valve is closed.

Figure 3: Service valve positions

JOB QUALIFICATION:
This job should be executed by an experienced automotive HVAC technician. For more information
on HVAC procedures refer to the maintenance manual of the vehicle.
NOTE: If you do not have the expertise to perform this procedure, do not hesitate to go to your
nearest ABC Service & parts Source dealership.

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SPECIAL TOOLS, EQUIPMENT OR SERVICES:
All-in one A/C station

PREPARATIONS:
•
•
•
•
•
•

Park the coach on a level surface with the front wheels straight.
Apply the parking brake and shut down the engine.
Switch off all systems and turn off the battery master switch.
Open the engine compartment doors
Put a “DO NOT OPERATE” tag on the steering wheel.
Read the entire procedure before beginning to work.

WARNING!
When working in the engine compartment, check the starter motor inhibitor
system before starting the steps, which do not require engine operation. Observe safe
shop practices at all times.

PROCEDURE:
Step
1

Action
Check the location of the high-pressure switch on the refrigerant compressor
discharge valve.
Is the high-pressure switch mounted into the port closest to the protective cap of
the valve stem?

2
3
4
5
6

• If yes, go further with step 2.
• If not, go immediately to step 5.
Evacuate the refrigerant compressor as explained in “STEP 2 IN DETAIL”.
Change the location of the high-pressure switch as explained in “STEP 3 IN
DETAIL”
Finalize the repair as explained in “STEP 4 IN DETAIL”.
Notify ABC Companies by mail. Write the text “SB2276 executed for VIN…..” in the
mail and send the mail to [email protected].
For ABC Companies only: register through the registration button located behind
Service bulletin SB2276 on the Van Hool customer portal. Write the text "SB2276
executed" in the field "Remark". Labor allowance will only be awarded after Van
Hool has received the registration.

End of procedure

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STEP 2 IN DETAIL: To evacuate refrigerant compressor
Step
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8

2.9

Action
Connect the manifold gauge set to the refrigerant compressor service valves.
Front seat the compressor suction service valve.
Start the engine and operate the compressor.
Continue to operate the compressor, observing the pressure gauge, until the low
pressure switch disengages (31.9 psig) the compressor clutch.
Shut-down the engine.
Front seat the compressor discharge service valve.
Connect the center hose of the manifold gauge set to a recovery station or an
evacuating cylinder.
Turn the high pressure cock of the manifold gauge set counterclockwise. The
refrigerant in the line between the compressor and the check valve is now
evacuated to the recovery station or evacuating cylinder.
Turn the high pressure cock of the manifold gauge set clockwise to the fully closed
position when the indicator on the high pressure gauge drops to 0.
High pressure switch and test connection can now be safely removed.

STEP 3 IN DETAIL: To change the location of the high-pressure switch
Step
3.1
3.2
3.3

3.4

Action
Screw the fitting adapter holding the test connection assembly out of the
refrigerant compressor.
Screw the elbow fitting holding the high-pressure switch assembly out of the
refrigerant compressor.
Apply sealant tape VH11640236 or similar to the threads of the elbow fitting
holding the high-pressure switch assembly. Screw the elbow fitting into the tapped
hole located furthest away from the protection cap of the valve stem.
Apply sealant tape VH11640236 or similar to the threads of the fitting adapter
holding the test connection assembly. Screw the fitting adapter into the tapped
hole located the closest to the protection cap of the valve stem.

STEP 4 IN DETAIL: To finalize repair
Step
4.1
4.2
4.3
4.4
4.5

Action
Evacuate the A/C compressor discharge hose.
Back seat the compressor suction and discharge service valves.
Check the refrigerant charge and add if necessary as indicated in the maintenance
manual.
Run the system and check operation.
Check connections for refrigerant leaks. Correct as required.

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WARRANTY:
1. Terms and conditions
Van Hool accepts claims for this modification as follows:
• Parts: • Labor allowance: 1 hour per vehicle
• Campaign expiration date: Service Bulletin issue date + 1 year
2. Claim references:
•
•
•

Job code: O62276N
Claim submission: Contact ABC Customer Care Warranty Department for guidance.
Monitoring and performance: The claim records pertaining to this Bulletin will be used to
determine that the remedy has been executed in accordance with the manufacturer’s
instructions and to evaluate the status of this Field Change Program.

INFORMATION HANDLING:
Important supplements and modifications of technical information not yet included
in the manual are communicated by means of Service Bulletins.

VAN HOOL CUSTOMER PORTAL:
Consult the Van Hool customer portal for the latest service documentation. Beside the
maintenance manual, you will also find the operating manual and the spare parts catalogue of your
vehicle on the customer portal. The customer portal is accessible through www.vanhool.be, and
only with a code (password) from Van Hool. If you do not have a password yet, request it by using
the link on the Van Hool website.

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