www.tdiclub.com

Economy - Longevity - Performance
The #1 Source of TDI Information on the Web!
Forums Articles Links Meets
Orders TDI Club Cards TDIFest 2014 Gone, but not forgotten VAG-Com List Unit Conversions TDIClub Chat Thank You



Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

Reply
 
Thread Tools
Old June 9th, 2011, 06:40   #1
jettajim
Veteran Member
 
Join Date: May 2000
Location: near Houston
Fuel Economy: 6spd=46 lifetime, '12 Passat gasser-terrible
Default How do I know if alternator pulley is bad

Hi,

On my wife's '00 Jetta TDI with 174,000miles, I get the 'noise' everyone is talking about when the ac is on. Many people said it's the alt pulley.

Someone said to check the alt pulley, stick a screw driver in the vanes to prevent it from rotating in one direction. I did this and the pulley only rotates in one direction--as it should. Now, does this mean that the 'noise' I hear only when the ac is on and only sometimes, is caused by a bad ac clutch? When I turn off the ac, the noise goes away.

I changed the alternator about 40K miles ago with a reblt Bosch. The ac compressor was changed about 60k miles ago.

Thanks for your help!
__________________
Jim

jettajim is offline   Reply With Quote
Old June 9th, 2011, 09:03   #2
paramedick
 
paramedick's Avatar
Default

1) remove serpentine belt from alternator pulley
2) stick small screwdriver in the fan blades of alternator thru case holes
3) attempt to spin the pulley in both directions. Should freewheel in CCW rotation, lock up in CW rotation.
__________________
Selected TDI Repair Services available. No greasecars, please.
To contact me: E mail = quick answer via iPhone. Click on username for E mail address. PMs are turned off!!!
An all TDI Family!!
paramedick is offline   Reply With Quote
Old June 9th, 2011, 10:33   #3
benIV
Veteran Member
 
benIV's Avatar
 
Join Date: Oct 2009
Location: SouthEast NC
Default

Can you check it without pinning the alternator fan blades? eg. just spinning the pulley by hand both ways?
__________________
OCD TDICLUB MEMBER #6
2003 TDI Mafia Member

1981 Mercedes 300D 350K RIP
1974 VW Super Beetle convertible 200K+
benIV is offline   Reply With Quote
Old June 9th, 2011, 10:40   #4
jettajim
Veteran Member
 
Join Date: May 2000
Location: near Houston
Fuel Economy: 6spd=46 lifetime, '12 Passat gasser-terrible
Default

Thanks for the reply. I did that and it locks in one direction so does that mean the alt pulley is not the pulley making the noise?

Thanks again for your help.
__________________
Jim

jettajim is offline   Reply With Quote
Old June 9th, 2011, 10:44   #5
benIV
Veteran Member
 
benIV's Avatar
 
Join Date: Oct 2009
Location: SouthEast NC
Default

if it locks in only one direction (CW) and spins free in the other (CCW) then the clutch pulley is working properly.

did you check the alt. pulley or the ac pulley?
__________________
OCD TDICLUB MEMBER #6
2003 TDI Mafia Member

1981 Mercedes 300D 350K RIP
1974 VW Super Beetle convertible 200K+
benIV is offline   Reply With Quote
Old June 9th, 2011, 12:15   #6
jettajim
Veteran Member
 
Join Date: May 2000
Location: near Houston
Fuel Economy: 6spd=46 lifetime, '12 Passat gasser-terrible
Default

Thanks Ben.

The alt pulley locked in one direction when I inserted a screw driver into the blades of the alternator. It spun freely in the other direction. This is all with the belt off, of course.

I didn't check the ac pulley. How is this done? I read about people having the clutch come completely off.

Thanks again for the help!
__________________
Jim

jettajim is offline   Reply With Quote
Old June 9th, 2011, 16:05   #7
benIV
Veteran Member
 
benIV's Avatar
 
Join Date: Oct 2009
Location: SouthEast NC
Default

to check the ac clutch pulley, i found these:

http://forums.tdiclub.com/showthread...ight=ac+clutch

second link mentions a clicking noise and a possible loose pulley central nut.
http://forums.tdiclub.com/showthread...ight=ac+clutch

just for starters, use the search tab right below your name near the top of the page.
__________________
OCD TDICLUB MEMBER #6
2003 TDI Mafia Member

1981 Mercedes 300D 350K RIP
1974 VW Super Beetle convertible 200K+
benIV is offline   Reply With Quote
Old June 10th, 2011, 06:06   #8
jettajim
Veteran Member
 
Join Date: May 2000
Location: near Houston
Fuel Economy: 6spd=46 lifetime, '12 Passat gasser-terrible
Default

Thanks Ben, I'll check them out.
__________________
Jim

jettajim is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Replace alternator pulley when replacing idler pulley?/Examining Belt Tensioner meccaA4 TDI 101 3 August 16th, 2010 12:53
Runtime w/ Bad alternator (pulley?) cleaver TDI 101 2 April 9th, 2010 06:15
Bad alternator pulley? bendiesel TDI 101 17 March 18th, 2010 18:42
Alternator Pulley bad, now Alternator? danielalves VW MKIV-A4 TDIs (VE and PD) 6 July 28th, 2009 05:32
Alternator Pulley repair tool w/b5.5 alternator pulley 06JettaTDIdsg Private TDI Items for Sale/Wanted 1 October 21st, 2008 14:27


All times are GMT -7. The time now is 10:40.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright - TDIClub Online LTD - 2014
Contact Us | Privacy Statement | Forum Rules | Disclaimer
TDIClub Online Ltd (TDIClub.com) is not affiliated with the VWoA or VWAG and is supported by contributions from viewers like you.
1996 - 2013, All Rights Reserved
Page generated in 0.12948 seconds with 10 queries
[Output: 84.28 Kb. compressed to 72.18 Kb. by saving 12.10 Kb. (14.36%)]