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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford F-150 Raptor General Discussions [GEN 2]
Anyone figure out the high pitch whistle sound when shutoff?
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<blockquote data-quote="JP77" data-source="post: 1416480" data-attributes="member: 33150"><p>Had this on an older F150 FX4. It’s was the vacuum reservoir releasing. Dirt, dust, moisture, etc can cause the actuator to not open/close efficiently. It’s gives that odd whistle when power is removed. This can cause the shift on the fly hubs to fail if the crud gets through the vacuum lines or the huns only partially engage. You can diagnose this with a vacuum gauge.</p></blockquote><p></p>
[QUOTE="JP77, post: 1416480, member: 33150"] Had this on an older F150 FX4. It’s was the vacuum reservoir releasing. Dirt, dust, moisture, etc can cause the actuator to not open/close efficiently. It’s gives that odd whistle when power is removed. This can cause the shift on the fly hubs to fail if the crud gets through the vacuum lines or the huns only partially engage. You can diagnose this with a vacuum gauge. [/QUOTE]
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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford F-150 Raptor General Discussions [GEN 2]
Anyone figure out the high pitch whistle sound when shutoff?
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