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. |
August 13th, 2019, 07:19
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#1907
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Newbie
Join Date: May 2018
Location: GA
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I started with the large fan not running, replaced that and it's fixed but still no clutch engaging. so i've run through these tests from the guide, and i'm getting 9.3V to the compressor and 9.5V under load and the clutch isn't engaging still. The G65 sensor is giving me about 2.3V so i don't think thats it either. I haven't checked all the leads at the FCM but considering I'm getting the correct voltage at the compressor it shouldn't have anything to do with the FCM would it?
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August 13th, 2019, 08:01
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#1908
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Veteran Member
Join Date: Feb 2003
Location: Niceville, FL
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What's the resistance across the clutch coil? If it's open you just found the problem.
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August 13th, 2019, 10:37
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#1909
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Veteran Member
Join Date: Mar 2005
Location: Back in So Flo - St Lucie
Fuel Economy: 26 - 58 mpg
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Quick tip - you need to check voltage to compressor clutch UNDER LOAD. Something a simple as a test light (regular bulb, no LED) is enough load.
Jason
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August 13th, 2019, 11:46
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#1910
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Newbie
Join Date: May 2018
Location: GA
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Quote:
Originally Posted by Genesis
What's the resistance across the clutch coil? If it's open you just found the problem.
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0L so guess that means it's the clutch?
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August 13th, 2019, 13:04
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#1911
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Veteran Member
Join Date: Feb 2003
Location: Niceville, FL
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Quote:
Originally Posted by olemiss36
0L so guess that means it's the clutch?
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Uh, yep. It should read something like 4ish ohms.
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August 14th, 2019, 16:19
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#1912
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Veteran Member
Join Date: Feb 2005
Location: Island near Vancouver
Fuel Economy: 850km/tank (2015GSW)
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When doing the initial fan test (ignition on, AC button pressed), what's the cause of one fan (small) turning, but the other not?
Also, no cold air blowing (even with engine running). But, figuring out the bad fan first.
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August 16th, 2019, 19:41
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#1913
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Veteran Member
Join Date: Feb 2003
Location: Niceville, FL
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Quote:
Originally Posted by Nuje
When doing the initial fan test (ignition on, AC button pressed), what's the cause of one fan (small) turning, but the other not?
Also, no cold air blowing (even with engine running). But, figuring out the bad fan first. 
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It's quite likely the fan itself is dead. The one that usually dies is, as you're seeing, the driver-side one. It's also quite-frequent for it to die only on low speed (that is, the resistor that drops the speed burns out, but the motor itself is still functional, so it will run on high -- at least for a while.)
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August 18th, 2019, 16:33
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#1914
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Newbie
Join Date: May 2018
Location: GA
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so the coil was reading 0.L as posted earlier and I ordered a new one on amazon It's reading 4 ohms of resistance so the question is should I just replace the coil or the compressor all together? I'm not that comfortable with doing the job myself with the belt removal and all i have to get the car up is a jack to work underneath the car so i found a guy that will do it for $200. Most of the shops I called said the coil is the first indication of a failed compressor and would only replace the entire compressor. This guy will do the entire compressor swapout for $260. I guess the question is, is it worth the $200 gamble to replace the coil only or should i spend the $150 on a compressor and replace the whole thing? My compressor is the original one and the car has 220k on it.
edit: going to attempt the repair wed with a buddy, if that doesn't work i'll go with the full compressor replacement.
Last edited by olemiss36; August 19th, 2019 at 04:45.
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August 19th, 2019, 11:19
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#1915
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Veteran Member
Join Date: May 2003
Location: Between Toronto & Montreal
Fuel Economy: 5.3 l/100 km (at 115 km/h)
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Quote:
Originally Posted by olemiss36
... is it worth the $200 gamble to replace the coil only or should i spend the $150 on a compressor and replace the whole thing?
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Only possible snag is that when trying to remove the nut holding the clutch in place, the compressor shaft may break (given the age of the car)... in that case, you'll be replacing the entire compressor, which will entail the "expert" level in removing and replacing the refrigerant and oil...
Good luck,
Yuri
__________________
Quando omni flunkus moritati
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August 21st, 2019, 17:37
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#1916
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Newbie
Join Date: May 2018
Location: GA
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replacing the coil seemed to fix it.
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September 22nd, 2019, 09:28
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#1917
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Veteran Member
Join Date: Mar 2005
Location: West Coast, Canada
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Just ran this test a few weeks back and found the main fan dead. I had recently noticed that doing some high passes in high heat my normally rock solid temp gauge would creep up a bit.
Pulled out the main fan, pulled the motor apart and found the brushes stuck and brush holders deformed and a mess. Cleaned it up and got it working but its just a patch job so I think a new fan is going to tag onto my next IDP order.
Curious, has anybody give any feedback on the Large/Small fan complete kit? https://www.idparts.com/dual-cooling...4-p-10375.html
Given the desert climates and mountain pass stuff that I do, can't imagine the second fan is in too good a shape, might make sense to just change them both?
Martin
__________________
2005 Jetta Wagon
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September 22nd, 2019, 09:41
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#1918
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Member
Join Date: Nov 2008
Location: Bolling AFB, DC
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I bought a big and small cheapo ebay fan about 4 years ago and they are still working great, even though they never shutoff in South Florida.
Sent from my SM-G930P using Tapatalk
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September 22nd, 2019, 09:56
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#1919
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Veteran Member
Join Date: Mar 2018
Location: US
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Quote:
Originally Posted by towforce
Just ran this test a few weeks back and found the main fan dead. I had recently noticed that doing some high passes in high heat my normally rock solid temp gauge would creep up a bit.
Pulled out the main fan, pulled the motor apart and found the brushes stuck and brush holders deformed and a mess. Cleaned it up and got it working but its just a patch job so I think a new fan is going to tag onto my next IDP order.
Curious, has anybody give any feedback on the Large/Small fan complete kit? https://www.idparts.com/dual-cooling...4-p-10375.html
Given the desert climates and mountain pass stuff that I do, can't imagine the second fan is in too good a shape, might make sense to just change them both?
Martin
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Personally I would change both and keep the small fan as a spare. IDparts typically sells good products (even if cheap/Chinese) and for that price I don't think it's risky, no?
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September 22nd, 2019, 20:11
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#1920
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Veteran Member
Join Date: Feb 2003
Location: Niceville, FL
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The small fan, for some reason, rarely fails. I have no idea why. My '03 has the OE small fan in it.... not so for the big one! And I live in Florida...
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