Solenoid valve, shut-off valve heat exchanger
| Solenoid valve, shut-off valve heat exchanger |
For cars with A/C, the climate control system for certain markets is equipped with a vacuum-operated shut-off valve for the heat exchanger. The purpose is to prevent, when needed, coolant from circulating through the heat exchanger so that max cooling is provided. The control module controls a solenoid valve which in turn operates the shut-off valve.
The solenoid valve is supplied from +54 via fuse 21 and is controlled on the ground side by the ACC unit pin 24.
Since the control module grounds the output, the solenoid valve opens and creates a vacuum on the shut-off valve which in turn closes off the coolant flow.
The control module closes the shut-off valve if the requested mixed-air temperature is below 6˚C (significant cooling needed).
| Diagnosis |
In case of an open circuit or short circuit, diagnostic trouble code B2375 is generated, and 18 is shown instead of temperature at calibration.
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