A/C heater problem buzzing noise from booster pump
11-24-2014, 03:49 PM
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S320 CDI w221 2009
A/C heater problem buzzing noise from booster pump
When heater is on above the coldest point I get a buzzing/rattle sound from the heater booster pump, but now my heater/AC shuts down.
All fans go off then will start again a short while later, noise is also intermittent. It's silent at the coldest setting with AC on or off. When shut down buzzing noise is still there from behind dashboard. It is not the heater blower motor/fan as the noise is constant if I turn fan up,or down. S320 w221
Any ideas?
All fans go off then will start again a short while later, noise is also intermittent. It's silent at the coldest setting with AC on or off. When shut down buzzing noise is still there from behind dashboard. It is not the heater blower motor/fan as the noise is constant if I turn fan up,or down. S320 w221
Any ideas?
