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  #1  
Old 04-27-2011, 01:51 PM
SalRanger2 SalRanger2 is offline
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Default thump/thud under hood?

my truck makes a thud/thump kinda sound under the hood and i can figure out what it is. its mostly when idleing. sometimes it will change the idlespeed but doesnt make it rough. it will thud every minute or so id guess. i think its coming from the drivers side under the hood so could it be something with the brake booster or something vaccum related? no check engine light and master cylinder is full.

im lost any comments will help! thanks!
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  #2  
Old 04-27-2011, 01:54 PM
HazardousRanger HazardousRanger is offline
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Default Re: thump/thud under hood?

goddammit get that squirrel out of ur engine bay!


no seriously......no idea
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Old 04-27-2011, 02:01 PM
SalRanger2 SalRanger2 is offline
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Default Re: thump/thud under hood?

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Originally Posted by hazardousranger View Post
goddammit get that squirrel out of ur engine bay!


no seriously......no idea
hahah, yea its wierd hopefully someone will have an idea on it
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Old 04-27-2011, 02:07 PM
Jimmeh Jimmeh is offline
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Default Re: thump/thud under hood?

Sure it's not just your AC pump?
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Old 04-27-2011, 02:09 PM
SalRanger2 SalRanger2 is offline
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Default Re: thump/thud under hood?

Quote:
Originally Posted by Jimmeh View Post
Sure it's not just your AC pump?
does that run with the defrost?
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Old 04-27-2011, 02:12 PM
Jimmeh Jimmeh is offline
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Default Re: thump/thud under hood?

Yes.
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05 Chevy Silverado 1500 W/T 4X4
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Old 04-27-2011, 02:13 PM
SalRanger2 SalRanger2 is offline
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Default Re: thump/thud under hood?

Quote:
Originally Posted by Jimmeh View Post
Yes.
ok well i cant remember if i have the defrost on when this happens so im gonna go run it now with everything off and see.

any ideas if it still does it?
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Old 04-27-2011, 02:29 PM
SalRanger2 SalRanger2 is offline
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Default Re: thump/thud under hood?

ok it was the compress/pump that runs off the belt. i could see it engage and disengage on and off even in a non-a/c setting(heat with blowing at face and feet). is that normal?
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  #9  
Old 04-27-2011, 02:50 PM
Jimmeh Jimmeh is offline
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Default Re: thump/thud under hood?

Quote:
Originally Posted by SalRanger2 View Post
ok it was the compress/pump that runs off the belt. i could see it engage and disengage on and off even in a non-a/c setting(heat with blowing at face and feet). is that normal?
Yup.
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Old 04-27-2011, 02:52 PM
SalRanger2 SalRanger2 is offline
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Default Re: thump/thud under hood?

Quote:
Originally Posted by Jimmeh View Post
Yup.
ok thanks alot. ill just have to turn it to "off" now to put all the horsies to the wheels and not there lol
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  #11  
Old 04-27-2011, 04:06 PM
SalRanger2 SalRanger2 is offline
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Default Re: thump/thud under hood?

im going to maybe see about getting it recharged, this could be partly why its doing it
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  #12  
Old 04-28-2011, 04:51 PM
RWD HERO RWD HERO is offline
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Default Re: thump/thud under hood?

If its low, it will cycle on and off. You can get a can of refrigerant, with the valve and gauge for $30 at any auto parts store. Plug it on to the suction line (the only one it will fit on) and charge away. It seems to me that if you charge liquid (turn the can upside down) it charges a lot faster.
P.S. the A/C needs to be on to charge. The suction line will pull it into the system.
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  #13  
Old 04-28-2011, 07:46 PM
SalRanger2 SalRanger2 is offline
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Default Re: thump/thud under hood?

Quote:
Originally Posted by RWD HERO View Post
If its low, it will cycle on and off. You can get a can of refrigerant, with the valve and gauge for $30 at any auto parts store. Plug it on to the suction line (the only one it will fit on) and charge away. It seems to me that if you charge liquid (turn the can upside down) it charges a lot faster.
P.S. the A/C needs to be on to charge. The suction line will pull it into the system.
ok cool thanks alot!
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  #14  
Old 04-30-2011, 10:20 AM
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Default Re: thump/thud under hood?

I suggest that you have some dye put in to see where it went in the first place. I'm not sure if you can get dye in the little cans or not
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  #15  
Old 05-15-2011, 07:59 PM
SalRanger2 SalRanger2 is offline
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Default Re: thump/thud under hood?

well i just hooked up the gauge and refridgerant fill can and i figured out the charge on it is fine... now im trying to figure out why my compressor engages/disengages on any setting except off. or is this normal?

i know for a/c and defrost settings it would be doing this but not on the others, any thoughts?
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2WD
5spd
K&N Filter
Air Box Mod
Explorer OHC
2/3 Drop

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