mystery thump when starting
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Freshman User
Joined: Apr 2007
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mystery thump when starting
sometimes just after I start my truck it will sound like someone took a 5lb sledge to the pass side floor pan just below the firewall, any ideas?
03 crew cab sb 6.0 psd auto
03 crew cab sb 6.0 psd auto
Post Fiend
Joined: Jul 2005
Posts: 14,582
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From: 21791
When you start your truck, be sure to turn the HVAC control **** to the OFF position. What you hear is the blend door in the HVAC system switching positions and it causes a loud thump when you first start it up. No need to check for midgets hiding under the truck.
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Freshman User
Joined: Apr 2007
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all that noise just becaues i didnt turn the switch off, well thank you that eases my mind some, one more thing has anyone had the air on at night and tried later to go to heat and it kept blowing cold? i thought maybe as good as my a/c is that it was frosting over
Post Fiend
Joined: Feb 2007
Posts: 14,541
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From: Dallas-Ft. Worth
I'm glad I'm not the only one that d@mn thing scared the cr@p out of!! I figured out what it was on my own, but when a truck is new (to me), it takes a while to get used to all the sounds it makes.
I never turn off my AC -- I don't think I've ever done that with any vehicle I've driven and I've never had a problem. I have heard a few folks recommend it be turned off at the panel when starting, though. What's the reason??
Joe
I never turn off my AC -- I don't think I've ever done that with any vehicle I've driven and I've never had a problem. I have heard a few folks recommend it be turned off at the panel when starting, though. What's the reason??
Joe
Cargo Master
Joined: Apr 2007
Posts: 2,333
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From: St. Louis, Mo.
A/c
I beleive it has to do with the load that the compressor pulls (amperage) on start up. Probably better to turn it off before starting any vehicle. My opinion only. Have a Good Holiday!
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Originally Posted by strokin_it7.3
When you start your truck, be sure to turn the HVAC control **** to the OFF position. What you hear is the blend door in the HVAC system switching positions and it causes a loud thump when you first start it up. No need to check for midgets hiding under the truck.
First time i hear that i thought somebody was hiding on the outside of my passenger side door and just hit the door with a hammer! Took me a minute to relize it was the vacuum being produced and then causing the blend door to move.
Erik
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