Solenoid valve, shut-off valve heater box
| Solenoid valve, shut-off valve heater box |
For cars with A/C, the climate control system for certain markets is equipped with a vacuum-operated shut-off valve for the heater box. The purpose is to prevent, when needed, coolant from circulating through the heater box 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.
This project is supported by memberships and donations. If you use this site, please consider Joining SCNA and/or making a donation.
Our Friends
