Service

Technical Information

173/21 ENU

1950

1

Warning Message “Coolant Temperature Too High”: Checking Coolant Pump and Change-Over Valve
(173/21)
Change overview:
Release

Date

Change

0

12/19/2022

•

First publication

1

03/12/2024

•

Test sequence adjusted

2

01/07/2025

•

Addition of PAB121237 for V8 Biturbo

Model Line:

Panamera (971)

Model Year:

As of 2017 up to 2024

Concerns:

Change-over valve for coolant pump

Cause:

The customer complains about a warning message “Coolant temperature too high”. A faulty coolant pump is
detected as the cause. Internal tests have shown that in some cases, the cause of a defective coolant pump
is a faulty change-over valve for the coolant pump.

Action required: If the coolant pump is faulty or leaking, also check the change-over valve for the coolant pump and replace it
if necessary.

Required tools, parts and material (V6 Turbo)
Tool:

•
•
•

P90999 - PIWIS Tester 4
Hand vacuum pump, e.g. VAS 6213 - Hand vacuum pump
Battery charger with a current rating of at least 90 A and - if required - also with a current and voltage
controlled charge map for lithium starter batteries, e.g. VAS 5908 90 A battery charger

For further information about the battery chargers to be used, see the corresponding Workshop Manual. ⇒
Workshop Manual '270689 Charging vehicle electrical system battery'
Parts Info:

Required parts:
Part No.

Designation
– Location

Number

PAB906283

⇒ Change-over valve
– Coolant pump

1 piece

⇒ Coolant pump

1 piece

and/or
9A712101304

AfterSales

Jan 7, 2025
Page 1 of 9

1

Service
1950

ENU

Technical Information

173/21

Additional parts required for replacing the coolant pump:

Materials:

9A712111903

⇒ Seal
– Coolant pump

1 piece

9A712117100

⇒ Sealing ring
– Coolant pipe above coolant pump

1 piece

9A700565200

⇒ O-ring (17 x 3)
– Coolant pipe above coolant pump

1 piece

9A712143713

⇒ Sealing ring (41.8 x 1.85)
Disconnect coolant pipe for coolant pump

1 piece

9A700792000

⇒ O-ring (31.34 x 3.53-N)
Disconnect coolant pipe for coolant pump

1 piece

Required materials (usually already available in the Porsche Center):
Part No.
00004330501
00004330516

Designation
– Location
⇒ Grease
– O-rings
⇒ Coolant additive

Quantity
5 grams/ 0.176 oz
0.5 liter/ 16.9 fl oz

Required parts and materials (V8 Biturbo)
Parts Info:

Part No.

Designation
– Location

Number

06H906283B

⇒ Solenoid valve
– Change-over valve coolant pump

1 piece

⇒ Coolant pump

1 piece

and/or
PAB121014C

Additional parts required for replacing the coolant pump:

Jan 7, 2025
Page 2 of 9

9A712122801

⇒ Seal
– Coolant pump

1 piece

9A700781400

⇒ O-ring (55 x 5.33)
– Coolant distributor housing on coolant pump

1 piece

9A712113900

⇒ Seal
– Coolant distributor housing outer

2 pieces

9A700780900

⇒ O-ring (80 x 4)
– Coolant distributor housing center

1 piece

AfterSales

Service

Technical Information

Materials:

173/21 ENU

1950

PAB121237

⇒ Connecting tube
– Coolant distributor housing

1 piece

95510742700

⇒ Round seal (12 x 2)
– Guide tube for oil dipstick

1 piece

N 90344501

⇒ O-ring (45 x 3)
– Pressure pipe

2 pieces

9A700872900

⇒ O-ring (14 x 3)
– Suction jet pump valve

2 pieces

N 90774002

⇒ Hexagon-head bolt (combination) (M16 x 1.5 x 75)
– Crankshaft vibration damper

1 piece

N 90666003

⇒ O-ring (11.5 x 3)
- ATF lines (front section) to transmission oil cooler

2 pieces

9A700819800

⇒ O-ring (15 x 3.6)
- ATF lines (front section) at connection point

2 pieces

1

Required materials (usually already available in the Porsche Center):
Part No.
00004330501
00004330516

Designation
– Location
⇒ Grease
– O-rings
⇒ Coolant additive

Quantity
5 grams/ 0.176 oz
0.5 liter/ 16.9 fl oz

Required tools (V8 Biturbo)
Tools:

•
•
•
•
•
•
•
•
•

Torque wrench, 2-10 Nm (1.5-7.5 ftlb.), e.g., V.A.G 1783 - torque wrench, 2-10 Nm (1.5-7.5 ftlb.)
Torque wrench, 20-100 Nm (15-74 ftlb.), e.g., VAS 5820 - torque wrench, 20-100 Nm (15-74 ftlb.)
Torque wrench, 40-200 Nm (30-148 ftlb.), e.g., V.A.G 1332A - torque wrench, 40-200 Nm
(30-148 ftlb.)
Hand vacuum pump for checking the changeover valve of the coolant pump, e.g. VAS 6213 - Hand
vacuum pump
VAS 6890 - Spring band clamp pliers
T40330 - Counter-hold tool
T40363 - Socket wrench a/f 24
P90999 - PIWIS Tester 4
Battery charger with a current rating of at least 90 A, e.g., VAS 5908 - battery charger 90 A

Additionally required tools for draining and refilling coolant:
•
•
•
•

9696 - Filling device
VAS 6562 - Porsche adapter set for cooling system tester
V.A.G 1274B - Cooling system testing unit
VAS 6096/2 - Vacuum pump

AfterSales

Jan 7, 2025
Page 3 of 9

1

Service
1950

ENU

Technical Information

173/21

Preparatory work (V6 Turbo)
Work Procedure: 1

Remove air guide. ⇒ Workshop Manual '243619 Removing and installing air guide (V6 turbo)'

2

Remove belt pulley. ⇒ Workshop Manual '195319 Removing and installing pulley (V6 turbo)'

3

Connect a suitable battery charger with a current rating of at least 90 A, e.g. battery charger 90 A, to
the jump-start terminals in the luggage compartment and switch it on. ⇒ Workshop Manual '270689
Charging vehicle electrical system battery'

4

Place driver’s key in emergency start tray.

5

Connect P90999 - PIWIS Tester 4 to the vehicle
communication module (VCI) via the USB cable,
connect communication module to the vehicle and
switch on PIWIS Tester.

6

Switch on ignition.

7

On the PIWIS Tester start screen, call up the “Diagnostics” application.
The vehicle type is then read out, the diagnostic application is started and the control unit selection screen is
populated.

Emergency start tray