Well, indeed... I checked around and it seems as though this part number is on general backorder. Some at GM sources, none at Amazon, a few units available on EBay but of dodgy provenance, and no used units listed on Car-Part.com The latter uses Hollander Interchange data so it will populate your request with matching parts from other vehicles, perhaps with different numbers but all functionally identical. So owners are stuck until GM fixes their supply chain. I'd still like to see a definitive writeup on failure modes and potential prevention. In one case a motor shorted out, in another the valve clogged.
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