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weird hiss coming from dash

1405 Views 2 Replies 2 Participants Last post by  Micksauto
ok, so i have never heard this b4. its a light hiss coming from the dash somewhere. almost sounds like an air brake. the truck is an 01 silverado 2500HD, 6.0l. this happens when cruising, at all speeds. this also happens about every 30 seconds or so. is this normal, what is it, or am i crazy? thanks!:neutral:
1 - 3 of 3 Posts
sounds like a vacuum hose loose or cracked
thats what i thought initially. but it only happens every 30 seconds or so.
1 - 3 of 3 Posts
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