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  #1  
Old 03-17-2008, 04:03 PM
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7.3 roll away thump

What causes the roll away thump on the 7.3's?
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Old 03-17-2008, 04:30 PM
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I dont know what you meen buy roll away thump,but the cab heater will make that noise
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Old 03-17-2008, 04:34 PM
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Originally Posted by jimmy View Post
I dont know what you meen buy roll away thump,but the cab heater will make that noise
The thump happens after it's put in R or D. And only happens once every start up.
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Old 03-17-2008, 04:36 PM
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I don't know. Mine has done it for YEARS. Most of the time while it's in park, right after I start it up.....Come to think of it, it hasn't done it since I've had my tranny rebuilt....I'll let you know if it does.
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  #5  
Old 03-17-2008, 04:45 PM
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If its doing it right after start up and it sounds like its coming from the floor area Its the heater blend door opening up
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Old 03-17-2008, 04:47 PM
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Originally Posted by Dave View Post
If its doing it right after start up and it sounds like its coming from the floor area Its the heater blend door opening up
That sounds like it. What is the heater blend door?
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  #7  
Old 03-17-2008, 04:49 PM
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Its what controls which vents the heat comes out of. It switches it from defrost, to floor or dash vents
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  #8  
Old 03-17-2008, 05:07 PM
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Originally Posted by Dave View Post
If its doing it right after start up and it sounds like its coming from the floor area Its the heater blend door opening up
Yep, that's what it sounds like. Man I'm gonna have to dynomat my interior to quiet that thing down!
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Old 03-17-2008, 05:25 PM
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So thats what that noise is. My girl friend has asked about it a couple times. Sometimes its a few seconds after its started. I thought i was the starter.
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  #10  
Old 03-17-2008, 07:31 PM
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wow, how loud is it on yall trucks? mine is a rather harsh thud and its loud. kind of shakes the floor.
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