Symptom-based workshop manual

Service
119/25 ENU

8745

8

Lack of Cooling Power or Failure of Air-Conditioning System - Warning Message “High-Voltage Battery
Cooling Malfunctioning” in Instrument Cluster (SY 119/25)
Vehicle Type:

911 GTS (992)
911 4 GTS (992)

Model Year:

As of 2025 up to 2026

Concerns:

Refrigerant line

Symptom:

The customer complains about a lack of cooling power or the failure of the air-conditioning system.
In addition, the warning message “High-voltage battery cooling malfunctioning” can light up in the
instrument cluster.
The following fault memory entries are stored in the fault memory of the thermal management control unit
(J1024):
•
•

B16A284 - Refrigerant circuit, interior cooling, pressure too low (00EA61)
P053400 - Refrigerant circuit, pressure too low (00EA6A)

In the course of the diagnosis, an insufficient refrigerant quantity is also detected in the refrigerant circuit.
Cause:

A damaged round seal at the engine compartment connection point of the refrigerant line from the
air-conditioning compressor - evaporator (section from air-conditioning compressor to engine compartment
connection point) and/or the refrigerant line from the air-conditioning compressor - condenser (section
from air-conditioning compressor to engine compartment connection point) can cause a leak in the
air-conditioning system.

Remedial
Action:

Check the air-conditioning system in accordance with the Workshop Manual using a leak detector in the area
of the refrigerant line connection points in the engine compartment for leaks.
If a leak is detected in the area of the connection points, replace the affected round seal.
Information
Due to the reduced accessibility of the engine compartment connection point, a test with nitrogen or forming
gas and a corresponding leak detector is recommended.

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8

Service
8745

Symptom-based workshop manual

ENU 119/25

Installation
Position:

Refrigerant line connection point in engine compartment

Required parts and materials as needed
Parts Info:

Part No.

Designation
– Location of use

Quantity

95557374901

⇒ Round seal 11 x 2.5
Refrigerant line between air-conditioning compressor and
condenser

1 piece

⇒ Round seal, 13.7 x 2.5
– Refrigerant line between air-conditioning compressor and
evaporator

1 piece

and/or
95557374902

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Symptom-based workshop manual
Material:

Service
119/25 ENU

8745

8

Required materials (usually already available in the Porsche Center)
Part No.

Designation
– Location of use

Quantity

....

⇒ Refrigerant compressor oil 1234yf
– Air-conditioning system

As required

....

⇒ Refrigerant 1234yf
– Air-conditioning system

As required

Required Tools
Tools:

•
•

•
•
•

P90999 - Porsche Tester 4
Battery charger with a current rating of at least 90 A and a current and voltage-controlled charge map
for lithium starter batteries, e.g., VAS 5908 - battery charger 90 A. For further information about the
battery chargers to be used, see the corresponding Workshop Manual. ⇒ Workshop Manual '270689
Charge battery and vehicle electrical system'
Air-conditioning service device recommended by Porsche for refrigerant R1234yf, e.g. VAS 581 001A
- Air-conditioning service device R1234yf
Nitrogen or forming gas
Leak detector, commercially available

Checking air-conditioning system in the area of the refrigerant line connection points in the engine compartment
for leaks
Work Procedure: 1
2
3

Remove air cleaner housing (upper part).

⇒ Workshop Manual '242519A2 Removing and installing air cleaner housing (upper part)'
Remove DME control unit.

⇒ Workshop Manual '247019A5 Removing and installing DME control unit'
Þ Test areas for
Check both refrigerant line connection points in the engine compartment for leaks ⇒
refrigerant line connection points in engine compartment -1- in accordance with the Workshop Manual.
⇒ Workshop Manual '870101A2 Checking air-conditioning system'

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8

Service

Symptom-based workshop manual

ENU 119/25

8745

Test areas for refrigerant line connection points in engine compartment
Assessment
( )

Both refrigerant line connection points in
the engine compartment have no leaks.

Action
Round seals on the refrigerant lines are OK.
Continue troubleshooting in some other way.
Continue with Step ⇒ 5.

✗)
(✗

4

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Page 4 of 5

One or both refrigerant line connection
points in the engine compartment have
leaks.

The round seal on one or both refrigerant lines is
not OK.
Continue with Step ⇒ 4.

Replace round seal of the affected refrigerant line at the refrigerant line connection point in the engine
compartment.
It is not necessary to remove the affected refrigerant line for this purpose.
For work procedure, see:
⇒ Workshop Manual '874319A1 Removing and installing refrigerant line from air-conditioning
compressor to condenser (section from air-conditioning compressor to engine compartment
connection point)'
and/or
⇒ Workshop Manual '874519A2 Removing and installing refrigerant line from air-conditioning
compressor to evaporator (section from air-conditioning compressor to engine compartment
connection point)'

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Service

Symptom-based workshop manual
5
6

119/25 ENU

8745

8

Install DME control unit.

⇒ Workshop Manual '247019A5 Removing and installing DME control unit'
Install air cleaner housing (upper part).

⇒ Workshop Manual '242519A2 Removing and installing air cleaner housing (upper part)'

Labor position and PCSS encryption
Labor position:
APOS

Labor operation

I No.

87450140

Check compressor/evaporator line (without aero
package)

87450141

Check compressor/evaporator line (with aero
package)

87454940

Rework compressor/evaporator line (without aero
package, 1 O-ring defective)

87454941

Rework compressor/evaporator line (with aero
package, 1 O-ring defective)

87454942

Rework compressor/evaporator line (without aero
package, 2 O-rings defective)

87454943

Rework compressor/evaporator line (with aero
package, 2 O-rings defective)
PCSS encryption:

Location (FES5)

87450

Compressor/evaporator line

Damage type (SA4)

5000

Leaks

Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training courses. They are
written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special tools may be necessary in
order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the safe operation of your vehicle, and
may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and safely. Part numbers listed in these bulletins
are for reference only. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a discrepancy, the work procedures in the PIWIS Tester
are the ones that must be followed.

© 2026 Porsche Cars North America, Inc.

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Feb 10, 2026
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