Circulation pump
| Circulation pump |
The climate system for cars with V6 engines and for cold markets is equipped with a circulation pump for the heat exchanger. The purpose is to increase the flow through the heat exchanger at low engine speeds so that maximum heating performance can be maintained.
The circulation pump is supplied from +30 from fuse 20 and is controlled on the ground side from pin 23 on the control module.
The control module starts the pump if the engine speed is below 1600 rpm when the outside temperature falls below 0°C. The control module shuts off the pump when the engine speed is above 2000 rpm or when the outside temperature exceeds 5°C.
The circulation pump also makes it possible to utilize the rest heat from the engine to heat the cabin after the engine has been switched off. This function is activated if AUTO is pressed for more than 1.2 s within 10 min of turning off the ignition.
The system is set as follows:
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circulation pump ON
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display lights up and shows normal function
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fan current 5A
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temperature regulation normal
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following buttons do not function: fan up/down, rear window heating, defrost
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SID indicates that the function is active and at the same time how much thermal energy is remaining in the cooling system in percent. This value is calculated continuously and is based on the mixed-air temperature when the air-mixing flaps are fully open. The function is active no longer than 30 minutes or until there is no heat remaining or OFF is pressed.
| Programming |
The function can be programmed with the diagnostics tool if a circulation pump is fitted after delivery.
| Diagnostics |
In the event of an open circuit or short circuit, diagnostic trouble code B2380 is set and 19 is displayed instead of right-hand temperature when calibrating.
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