Even though I just finished cosmetically restoring my '83 HMMWV, I've not driven it much. Driving it the last two nights, it has issued an air leak noise about which I'm inquiring. After driving it at 55mph for about 15 minutes, I hear a prolonged air leak noise almost like an extended turbo wastegate noise (but alas, no turbo here). it concerned me the first time I heard it, wondering if a gasket or something let go, but the noise went away only to reoccur on the next drive. Any thoughts? I've attached a picture of a release valve? under the driver's wheel well on the fire wall. What is that and could that be the noisemaker? (FYI, I've got the doors off, so can hear "things" more loudly.) Thank you!
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