Quote:
Originally Posted by jay_bob
They cycle it on and off rapidly to modulate the temperature.
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You're kidding me.. Really? They modulate the valve this way? I just assumed it was a binary on/off valve... If the climate control is calling for any heat, then it opens to heater core, else don't flow there.
And frankly, in Canada, it would be heating the core most days anyway... So to me was an easy delete consideration if it ever failed I'd replace with straight plumbing or maybe a 3-way brass valve with a summer/winter switchover.
I wonder if this is the source of the buzzing sound I get at different pitches and amplitudess in my drive cycle on a cold day when my climate controls are heating the car? I though the vibrating sounds were related to vacuum pods that are oscillating because they're getting weak or small leaks near some natural resonant frequency point of stresses.
I noticed the monovalve is all rubbery mounted, so what you're saying makes sense and Benz has tried to keep the buzz muted. But if it's modulating I'm going to put a stethoscope on it next time I get a particularly loud hummmm in the climate system. This should help get around the problem of as soon as you open the hood the diesel clatter dominating any other noises.
And I'll take a second look that the valve is not touching anything it shouldn't bumped up against it... I've added a few things in that area for taking more power sources off the battery, for example.