Read and follow the introductory information and
safety information first⇒
Introduction
to the subject
Your vehicle is not equipped with an Event Data Recorder (EDR).
EDRs, sometimes called crash recorders, are installed by some manufacturers for the express purpose of capturing data for retrieval after an accident or crash event.
Some state laws restrict the retrieval or downloading of data stored by EDRs installed in a vehicle for the express purpose of retrieving data after an accident or crash event without the owner's consent.
Although your vehicle is not equipped with an EDR, it is equipped with a number of electronic control modules for various vehicle systems, such as engine management, emission control, airbags, and safety belts.
These electronic control modules also record data during normal vehicle operation for diagnostic and repair purposes. Their recording capability is limited to data (no sound is recorded). Only a small amount of data is actually recorded over a very limited period of time, or stored when a system fault is detected by a control module. Some of the data stored may relate to vehicle speed, direction, or braking, as well as restraint system use and performance in the event of a crash. Stored data can only be read and downloaded with special equipment.
Volkswagen Tiguan Service and Repair Manual > A/C System, General Information: Refrigerant R134a
Refrigerant R134a Physical Data
Vehicle air conditioning systems make use of the vaporization and
condensation process. In this case, one works with a substance which boils
easily, designated as refrigerant.
The refrigerant employed is tetrafluoroethane R134a, which boils at -26.5 ºC
(-15.7 ºF) ...