NHTSA ID Number: 11022997
Manufacturer Communication Number: No. 173-21
TSB/Document Date: 2025-09-09
Summary
Technical information for a warning message "coolant temperature too high" checking coolant pump and change over valve
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TSB/Document ID: No. 173-21
Replacement Service Bulletin Number:
MFR Communication Date: 2025-08-28
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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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:
Model Line:
Release
Date
Change
0
12/19/2022
•
First publication
1
03/12/2024
•
Addition of V8 order types
2
07/26/2024
•
Update of parts information for V8 Biturbo
3
01/07/2025
•
Addition of PAB121237 for V8 Biturbo
4
8/27/2025
•
Update to phrasing of step 3 under Checking change-over
valve for coolant pump and replacing it if necessary (V6 Turbo)
Macan S (95B) / Macan GTS (95B) / Macan Turbo (95B)
Cayenne (9YA / 9YB)
Model Year:
As of 2018 up to 2023
Equipment:
V6 Turbo engine
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.
Model Line:
Cayenne (9YA / 9YB)
Equipment:
4.0-liter V8 Biturbo engine
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 in the coolant pump.
AfterSales
Aug 27, 2025
Page 1 of 12
1
Service
Technical Information
ENU 173/21
1950
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)
Tools:
•
•
•
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
and/or
9A712101304
⇒ Coolant pump
1 piece
Additional parts required for replacing the coolant
pump:
Materials:
9A712111903
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
Aug 27, 2025
Page 2 of 12
Designation
– Location
⇒ Grease
– O-rings
⇒ Coolant additive
AfterSales
Quantity
5 grams/ 0.176 oz
0.5 liter/ 16.9 oz
Service
Technical Information
173/21 ENU
1950
1
Required parts and materials (V8 Biturbo)
Parts Info:
Part No.
Designation
– Location
Number
9A7906283
⇒ Change-over valve
– Change-over valve coolant pump
1 piece
⇒ Coolant pump
1 piece
and/or
PAB121014C
Additional parts required for replacing the coolant pump:
9A712122801
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
PAB121237
⇒ Connecting tube
– Coolant distributor housing
1 piece
95510742700
⇒ Round seal (12 x 2)
– Guide tube for oil dipstick
1 piece
N 90774002
⇒ Hexagon-head bolt (combination)
(M16 x 1.5 x 75)
– Crankshaft vibration damper
1 piece
9A726093806
⇒ Deflection roller with screw
– V-ribbed belt for air-conditioning compressor
1 piece
PAC906054A
⇒ Oil pressure sensor
– >> - 30/04/2023
1 piece
⇒ Oil pressure sensor
– 01/05/2023 >>
1 piece
or
PAB906060
AfterSales
Aug 27, 2025
Page 3 of 12
1
Service
1950
Technical Information
ENU 173/21
Valid for vehicles with Porsche Dynamic Chassis Control (PDCC) (M-No. 1P7) and without engine underprotection (M-No. 1SF)
PAF00072900
⇒ Hexagon socket head bolt
– Front section of front underbody cover
3 pieces
or
Valid for vehicles with engine underprotection (M-No. 1SF)
N 10082912
⇒ Hexagon flange bolt (combination), M6 x 16
– Front engine protection on holder
3 pieces
Additional parts required for adjusting the chassis:
Materials:
PAF91237901
⇒ Hexagon flange bolt (combination)
(M14 x 1.5 x 100)
– Front axle carrier on body rear
4 pieces
PAF91184301
⇒ Hexagon-head bolt (M12 x 1.5 x 90)
– Front axle carrier on body front
4 pieces
PAF005372
⇒ Cheese head bolt with multiple-tooth head
(M12 x 1.5 x 51)
– Front axle support to front axle carrier
2 pieces
PAF911511
⇒ Hexagon-head bolt (combination)
(M12 x 1.5 x 42)
– Front axle support to front axle carrier
4 pieces
WHT002305
⇒ Square nut (M12 x 1.5)
– Front axle support to front axle carrier
4 pieces
Required materials (usually already available in the Porsche Center):
Part No.
00004330501
00004330516
Aug 27, 2025
Page 4 of 12
Designation
– Location
⇒ Grease
– O-rings
⇒ Coolant additive
AfterSales
Quantity
5 grams/ 0.176 oz
0.5 liter/ 16.9 fl oz
Service
Technical Information
173/21 ENU
1950
1
Required tools (V8 Biturbo)
Tool:
•
•
•
•
•
•
•
•
•
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
3094 - Hose clamp
•
VAS 6096/2 - Vacuum pump
Additionally required tools for measuring and adjusting the assist systems:
•
•
•
•
•
•
•
•
•
•
•
9229/1 - Puller hook
T40183 - Insertion tool
VAS 6826 - Steering wheel balance
VAS 6918 - Quick-clamping unit
VAS 6430/1A - Adjustment device with reflector
VAS 6430/3 - Mirror for adjustment device
VAS 6350A - Calibration unit
VAS 6430/6 - Night View Assist calibration unit
VAS 6430/4 - Lane Keep Assist calibration board
VAS 6350/2A - Spacing laser
VAS 721 001 - Calibration System
Additionally required Tools for adjusting the main headlights:
•
•
•
LED headlights: VAS 5209B - Headlight aiming device
Setting LED headlights or Matrix LED headlights: VAS 5208A - Headlight aiming device
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