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Sorry, I meant EBP valve, not EGR. I disconnected it years ago, so the wheezing isn't that. Acceleration is fine.
There' s definitely vacuum on this van, there's a vacuum pump which runs a number of systems. The sound reminds me of the sound of air being sucked in or escaping, a whistling sound, which made me think vacuum.
The no-belt idea is great, thanks, will try that the next time I cold-start it. If it still makes the sound, then I'll know for sure it isn't related to anything belt-driven (i.e. I can rule out A/C, alternator, water pump, vacuum pump, and power steering pump).
On a side note, I noticed the other day that the power steering system is leaking fluid, so maybe the noise is from there. I'll see if fixing that leak stops the noise.