Thump when A/C comes on
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New User
Joined: Oct 2004
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Thump when A/C comes on
A buddy of mine has a 2005 F-250 PS that has been back to the dealer several times to have them fix a Thump noise when the A/C compressor kicks in. It's very pronounced, you can feel the floorbord vibrate as well as the audiable "bump/thump" sound. The dealer is "waiting to here back from Ford". They say they are getting similar complanits from 2005 Mustang owners .... Anyone out there have a similar problem? Were you able to get it Fixed? ... The truck has only about 1,100 miles on it ............. I have a 2005 F-250 PS that, at least to date, does not have this problem ... Thanks folks.
New User
Joined: Oct 2004
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From: Stansbury Park, Utah
The dreaded thump
I to am having the "Thump"...I notice it when I'm idling or driving very slow...like through a parking lot...I haven't noticed if it was from the A/C or not...but it is very pronounced and vibrates the floor board...I have a 2005 6.0 PSD and thought it was the engine...Any ideas...
Senior User
Joined: Oct 2002
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From: Newport Beach
It's not that big of a deal- your truck loses vacuum pressure when parked for a few hours, the blend door relaxes, you start your truck with the AC or defrost on and the vacuum returns moving the door again. You can avoid this by setting your AC controls to off when starting your truck. All years do this.
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Joined: Nov 2004
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From: Wash. State
AC thump
Hi Tlattin,
My truck does it all the time in defrost or mixs mode whenever the AC cycles.
My truck does it all the time in defrost or mixs mode whenever the AC cycles.
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From: North Dakota
hey it's my 100th post!!!
Yeh I've got the same thump. It's fairly loud and happens shortly after starting it. Usualy I have the defroster on when it does this. My service manager couldn't seem to duplicate it and had know idea what it was, not sure if he was playing dumb or not.
If somebody knows an actual fix let us know. (other than shutting off the ac/heater)
Yeh I've got the same thump. It's fairly loud and happens shortly after starting it. Usualy I have the defroster on when it does this. My service manager couldn't seem to duplicate it and had know idea what it was, not sure if he was playing dumb or not.
If somebody knows an actual fix let us know. (other than shutting off the ac/heater)
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Senior User
Joined: Oct 2002
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From: Newport Beach
Originally Posted by sach394
Hi Tlattin,
My truck does it all the time in defrost or mixs mode whenever the AC cycles.
My truck does it all the time in defrost or mixs mode whenever the AC cycles.
SLE- your service manager wouldn't be able to duplicate the sound without bleeding off the vacuum storage- have him do that, then start the engine with the AC or defrost switch on before cranking. If he has a cure let us know, would ya?
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Joined: Dec 2004
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The sound is coming from your condessor. It is a common problem. There is no fix. I had it troubleshot on my 2000 F-350. I just bought my 2005 F-350 same thing. It is just the nature of the beast. Nothing to worry about. Just enjoy the truck and imagine what is was like without air. LOL
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Joined: Jan 2003
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From: 3rd Rock
Originally Posted by 2005fordf350
The sound is coming from your condessor. It is a common problem. There is no fix. I had it troubleshot on my 2000 F-350. I just bought my 2005 F-350 same thing. It is just the nature of the beast. Nothing to worry about. Just enjoy the truck and imagine what is was like without air. LOL
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