No. 173-21-2

Service
Technical Information
173/21 ENU
1950
1
Warning Message “Coolant Temperature Too High”: Checking Coolant Pump and
Change-Over Valve (173/21)
Revision:
This bulletin replaces bulletin Group 1 173/21, dated December 19, 2022.
Model Year:
As of 2018 up to 2023
Model Line:
Macan S (95B) / Macan GTS (95B) / Macan Turbo (95B)
Cayenne (9YA / 9YB)
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.
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
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Service
1950
Technical Information
ENU 173/21
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
 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
9A7906283
 Change-over valve
– Change-over valve coolant pump
1 piece
and/or
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Service
Technical Information
PAB121014C
173/21 ENU
 Coolant pump
1950
1
1 piece
Additional parts required for replacing the coolant pump:
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
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
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:
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
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Service
Materials:
Technical Information
ENU 173/21
1950
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
Designation
– Location
 Grease
– O-rings
 Coolant additive
Quantity
5 grams/ 0.176 oz
0.5 liter/ 16.9 fl oz
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:
•
•
•
•
•
•
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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
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Service
Technical Information
•
•
•
•
•
173/21 ENU
1950
1
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
MATRIX LED headlights: VAS 621 001 - Headlight adjusting unit
Preparatory work (V6 Turbo)
Work Procedure: 1
Remove belt pulley.  Workshop Manual '195319 Removing and installing pulley (V6 turbo)'
2
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'
3
Place driver’s key in emergency start tray.
4
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.
5
Switch on ignition.
6
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
Preparatory work (V8 Biturbo)
Work Procedure: 1
2
Remove moulded hose.  Workshop Manual '213919 Removing and installing moulded hose (V8
Biturbo)'
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'
AfterSales
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Service
Technical Information
ENU 173/21
1950
3
Place driver’s key in emergency start tray.
4
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.
5
Switch on ignition.
6
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
Checking change-over valve for coolant pump and replacing it if necessary (V6 Turbo)
Work
Procedure:
Position of change-over valve and coolant pump
1
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Pull vacuum hose  Position of change-over valve and coolant pump -1- off the coolant pump 
Position of change-over valve and coolant pump -2-.
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Service
Technical Information
173/21 ENU
1950
1
2
Pull off vacuum hose  Position of change-over valve and coolant pump -4- from the control valve
 Position of change-over valve and coolant pump -3-.
3
VAS 6213 - Hand vacuum pump must be  Position of change-over valve and coolant pump -3connected to the change-over valve  Position of change-over valve and coolant pump -4- on the
vacuum hose connection. Then build up vacuum.
Information
Stop the test procedure if a vacuum cannot be built up. In this case, the change-over valve is faulty
and must be replaced. Continue with Step 5. If a vacuum can be built up, continue with Step 4.
4
Perform drive link test:
4.1
Select “Motor electronics (DME)” control unit.
4.2
Select the “Drive links/checks” menu.
4.3
Select “Drive links” and press •F12“ Next to confirm.
4.4
Select “Activation of vacuum switchover valve for main coolant pump” and press
•F8“ to start.
•
•
If the vacuum in the vacuum pump display changes, the change-over valve  Position
of change-over valve and coolant pump -3- is intact. Continue with Step 5. In this case,
only  Position of change-over valve and coolant pump -2- replace the coolant pump if
it is faulty.
If the vacuum in the vacuum pump display does not change, the change-over valve 
Position of change-over valve and coolant pump -3- and, if necessary, the coolant pump
 Position of change-over valve and coolant pump -2- must be replaced, if the coolant
pump is  Position of change-over valve and coolant pump -2- also faulty.
 Workshop Manual '195019 Removing and installing coolant pump (V6 biturbo)'
5
Disconnect VAS 6213 - hand vacuum pump from the vacuum hose  Position of change-over
valve and coolant pump -1-.
6
Install vacuum hose  Position of change-over valve and coolant pump -1- on coolant pump 
Position of change-over valve and coolant pump -2-.
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Service
Technical Information
ENU 173/21
1950
Checking change-over valve for coolant pump and replacing it if necessary (V8 Biturbo)
Work
Procedure:
Position of change-over valve and coolant pump
1
Pull vacuum hose  Position of change-over valve and coolant pump -1- off the coolant pump 
Position of change-over valve and coolant pump -2-.
2
Pull off vacuum hose  Position of change-over valve and coolant pump -4- from the control valve
 Position of change-over valve and coolant pump -3-.
3
VAS 6213 - Hand vacuum pump must be  Position of change-over valve and coolant pump -3connected to the change-over valve  Position of change-over valve and coolant pump -4- on the
vacuum hose connection. Then build up vacuum.
Information
Stop the test procedure if a vacuum cannot be built up. In this case, the change-over valve is faulty
and must be replaced. Continue with Step 5. If a vacuum can be built up, continue with Step 4.
4
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Perform drive link test:
4.1
Select “Motor electronics (DME)” control unit.
4.2
Select the “Drive links/checks” menu.
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Service
Technical Information
173/21 ENU
1950
1
4.3
Select “Drive links” and press •F12“ Next to confirm.
4.4
Select “Activation of vacuum switchover valve for main coolant pump” and press
•F8“ to start.
•
•
If the vacuum in the vacuum pump display changes, the change-over valve  Position
of change-over valve and coolant pump -3- is intact. Continue with Step 5. In this case,
only  Position of change-over valve and coolant pump -2- replace the coolant pump if
it is faulty.
If the vacuum in the vacuum pump display does not change, the change-over valve 
Position of change-over valve and coolant pump -3- and, if necessary, the coolant pump
 Position of change-over valve and coolant pump -2- must be replaced, if the coolant
pump is  Position of change-over valve and coolant pump -2- also faulty.
 Workshop Manual '195019 Removing and installing coolant pump (V8 Biturbo)'
5
Disconnect VAS 6213 - hand vacuum pump from the vacuum hose  Position of change-over
valve and coolant pump -1-.
6
Install vacuum hose  Position of change-over valve and coolant pump -1- on coolant pump 
Position of change-over valve and coolant pump -2-.
Follow-up actions (V6 Turbo)
Work Procedure: 1
Switch off ignition.
2
Disconnect P90999 - PIWIS Tester 4 from the vehicle.
3
Remove the driver’s key from the emergency start tray.
4
Switch off and disconnect the battery charger.
5
Install belt pulley.  Workshop Manual '195319 Removing and installing pulley (V6 turbo)'
Follow-up actions (V8 Biturbo)
Work Procedure: 1
Switch off ignition.
2
Disconnect P90999 - PIWIS Tester 4 from the vehicle.
3
Remove the driver’s key from the emergency start tray.
4
Switch off and disconnect the battery charger.
5
Install moulded hose.  Workshop Manual '213919 Removing and installing moulded hose (V8
Biturbo)'
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Technical Information
ENU 173/21
1950
Labor position and PCSS encryption (V6 Turbo)
Labor position:
I No.
APOS
Labor operation
19505550
Replacing coolant pump (checking change-over
valve)
19505551
Replacing coolant pump (checking, removing and
installing change-over valve)
PCSS encryption:
Location (FES5)
19500
Coolant pump
Damage type (SA4)
5000
leakages
References:
 Workshop Manual '270689 Charging vehicle electrical system battery'
 Workshop Manual '195319 Removing and installing pulley (V6 turbo)'
 Workshop Manual '195019 Removing and installing coolant pump (V6 biturbo)'
Labor position and PCSS encryption (V8 Biturbo)
Labor position:
APOS
Labor operation
19505540
Replacing coolant pump (checking change-over
valve)
19505541
Replacing coolant pump (checking, removing and
installing change-over valve)
44950300
Performing vehicle at front + rear
19381750
Draining and filling coolant
19010140
Check cooling system
94151650
Adjusting headlights
91722550
Calibrating Surround View camera
91662652
Calibrating front corner radar
91662653
Calibrating front corner radar
90802550
Calibrating infrared camera
27851550
Adjusting distance measuring sensor control unit
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I No.
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Service
Technical Information
173/21 ENU
1950
1
PCSS encryption:
Location (FES5)
19500
Coolant pump
Damage type (SA4)
5000
leakages
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.
© 2024 Porsche Cars North America, Inc.
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