Advanced Technical Information
PHEV AC Shut Off Valves Diagnosis

8

CAY, PNM
8700
1701
Binder – 8 – Air Conditioning

Vehicle Type:

Cayenne S E-Hybrid, Panamera S E-Hybrid

Model Year:

2015 - 2017

Information:

Diagnosis information for the air conditioning chiller and evaporator shut off valves.

Symptom:

No cooling in the passenger compartment.
NOTE: A low state of charge of the High Voltage Battery can cause the AC to be deactivated until the
state of charge increases to an adequate level. Customers who do not plug their vehicle in on a regular basis may have this issue.
There are two shut off valves in the refrigeration circuit.
1. The chiller shut off valve is normally open and requires 12V be applied to it from the AC control unit
to close it. This would stop cooling of the high voltage battery.
a. Power and ground from the AC CU can be checked at the connector of the valve.
2. The evaporator shut off valve is normally closed and requires 12V to be applied to it, via a relay, in
order for the valve to open and provide cooling to the passenger compartment.
a. The evaporator shut off valve can be diagnosed easily by removing the relay and jumping the load contacts of the relay to see if power makes it to the valve. Power at the
valve opens it and the evaporator gets cold with normal AC operation.
b. The relay winding circuit can be tested for power and ground from the AC CU.
Refer to the diagrams on the following pages.

©2017 Porsche Cars North America, Inc.

AfterSales

February 20, 2017
Page 1 of 4

8

CAY, PNM
8700
1701

Advanced Technical Information
AC Control Unit
Actuates the Evaporator shut off valve via a relay.
The valve is closed without 12V from the relay.

High
Pressure
Sensor

Evaporator Shut Off Valve Relay

High Pressure
service port

Evaporator

High Pressure

Shut off

service port

Valve

Compressor
Chiller

T
X
V

T
X
V

Evaporator

Internal Heat Exchanger

AC Control Unit

Low Pressure

Directly applies power and ground for the chiller shut off valve.

Service Port

Valve is open without 12V applied from AC CU.

February 20, 2017
Page 2 of 4

AfterSales

©2017 Porsche Cars North America, Inc.

CAY, PNM
1701
8700

Advanced Technical Information

E4

AC Control Unit

©2017 Porsche Cars North America, Inc.

8

A6

AfterSales

February 20, 2017
Page 3 of 4

8

CAY, PNM
8700
1701

Advanced Technical Information

The Evaporator Shut Off Valve Relay is in the location shown below in position 6.

Dealership
Distribution
Routing

Service Manager

________

Shop Foreman

________

Service Technician

________

________

________

________

Asst. Manager

________

Warranty Admin.

________

Service Technician

________

________

________

________

Dr. Ing. h.c. F. Porsche AG is the owner of numerous trademarks, both registered and unregistered, including without limitation the Porsche Crest®, Porsche®, Boxster®, Carrera®, Cayenne®, Cayman®,
Macan®, Panamera®, Speedster®, Spyder®, Tiptronic®, VarioCam®, PCM®, PDK®, 911®, RS®, 4S®, 718®, 918 Spyder®, FOUR UNCOMPROMISED®, and the model numbers and distinctive shapes of
the Porsche automobiles such as, the federally registered 911 and Boxster automobiles. The third party trademarks contained herein are the properties of their respective owners. Porsche Cars North America,
Inc. believes the specifications to be correct at the time of printing. However, specifications, standard equipment and options are subject to change without notice. Some options may be unavailable when a car
is built. Some vehicles may be shown with non-U.S. equipment. Please ask your authorized Porsche dealer for advice concerning the current availability of options and verify the optional equipment that you
ordered. Porsche recommends seat belt usage and observance of traffic laws at all times.

February 20, 2017
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©2017 Porsche Cars North America, Inc.