Whistle in Engine Bay
October 29th, 2022, 11:19 AM
#1
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Whistle in Engine Bay
Hello,
I have an 08 Express 3500 cutaway (mini bus) 4.8L with 41,XXX miles on it. I'm hearing a whistle nosie when I let off the throttle above 35mph. The noise goes away when the throttle is pushed or the trans is shifted from Drive to a lower gear. It sounds like it's coming from the passenger side but hard to tell when driving.
I have an 08 Express 3500 cutaway (mini bus) 4.8L with 41,XXX miles on it. I'm hearing a whistle nosie when I let off the throttle above 35mph. The noise goes away when the throttle is pushed or the trans is shifted from Drive to a lower gear. It sounds like it's coming from the passenger side but hard to tell when driving.
October 29th, 2022, 11:33 AM
#2
check for vacuum leaks
October 29th, 2022, 12:23 PM
#4
Vacuum leak in the passenger footwell area would likely be the HVAC controls.
October 29th, 2022, 1:49 PM
#6
HVAC position doesn't matter. Vacuum is present anytime the engine is running.
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