Heater valve/Aux water pump

**nrp22101** · 01-20-2018, 07:45 PM

Looking for guidance with respect to a rhythmic and loud clicking sound coming from my heater valve. Sounds like solenoids constantly activating. I am also getting an abnormal amount of water swishing sound from behind dash.
1. Is this a sign either the heater valve or water pump is falling or could it be something else?
2. Should I think about changing both if I have to change either one?
Thanks for your input.

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**Dr. T** · 01-20-2018, 08:06 PM

Both sounds are normal

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**nrp22101** · 01-20-2018, 08:12 PM

Originally Posted by Dr. T

Both sounds are normal

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Heater valve solenoids are supposed to activate ALL the time and regardless of whether heater/AC is on?

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**Dr. T** · 01-20-2018, 08:24 PM

Yeah they kinda click off/on all the time seemingly irrespective of hvac settings

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**olinjohnston** · 01-20-2018, 08:30 PM

Originally Posted by Dr. T

Yeah they kinda click off/on all the time seemingly irrespective of hvac settings

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Turning the temperature wheels to max cold should prevent the click-click.

**shogun** · 01-20-2018, 08:33 PM

Only without 12V they are silent = switched off = valves are open, when you set a temperature the valves are pulsing to regulate the temperature. In case they are too loud, check the 2 vibration dampers #15 http://www.realoem.com/bmw/enUS/show...diagId=64_0638
usually they break when old, then the clicking noise is louder.

Turning the temperature wheels to max cold should prevent the click-click.

yes = switched off valves = full hot = valves are fully open, right side temperature control wheel setting is overridden

**nrp22101** · 01-20-2018, 08:49 PM

Originally Posted by shogun

Only without 12V they are silent = switched off = valves are open, when you set a temperature the valves are pulsing to regulate the temperature. In case they are too loud, check the 2 vibration dampers #15 http://www.realoem.com/bmw/enUS/show...diagId=64_0638
usually they break when old, then the clicking noise is louder.

yes = switched off valves = full hot = valves are fully open, right side temperature control wheel setting is overridden

Good stuff! Thanks.

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**ltbrett** · 01-21-2018, 12:45 AM

Air tends to get trapped in there causing more swishing noise. Perhaps a good bleed will help. Just like medieval times. Break out the leeches or search the site for how to bleed.

Brett