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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.

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Old August 12th, 2018, 21:38   #1846
Join Date: Feb 2016
Location: Portland

Checking A/C Cooling fans for operation as directed by DanG144 on #1. Diagnostics show left fan inoperative high and low speed. Disassembled old fan which suffered from the apparent epidemic melting brush holders and ceased functioning. I do not know how long this situation has been occurring.
Ordered new Behr fan from FCP.com, a long term supplier of mine in the Volvo world.

Thanks Dan!

Last edited by tom2turbo; August 12th, 2018 at 21:40.
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Old August 13th, 2018, 06:29   #1847
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Join Date: Mar 2005
Location: Old Hickory, TN. Settling here...

Originally Posted by The4ork View Post
Hi folks. 2012 Jetta issue.
I was having intermittent cooling fan operation, noticed by my a/c kicking on and off in city driving/red lights.
So i replaced the main large fan with new. seemed to work flawless for a day (probably coicidence) and im right back where i started.
I thought maybe i didnt connect the main electrical connector all the way so i jacked the car, pulled the lower cover off and right before i stuck my hand on the connector my fans randomly kicked on for the after-run function. I thought that was very odd.
Perhaps its the a/c pressure switch? as in the pressure had changed while it sat for 10 or so minutes while i was jacking the car and removing the cover?
any help would be greatly appreciated. I dont have a vag com and plan on getting some help later today but its not a guarantee i'll be able to do it.
Fans on 2012 Jetta (from ElsaPro);

Fan control module is built into large fan. It receives a data signal from ECM. Fan will default to 100% if powered up and missing communication with ECM. There is no set "high" or "low" speed - is is commanded a percentage between 0% and 100% depending on load.

And that warning on your radiator support "Fans may start at any time" goes along with the TSB that with TDI engines fans may run up to 16 minutes after car is shut off.

Sounds like you may have taken trouble shooting from the wrong type of car. BTW, I always remind people that both fans always run together. If only one fan is running there is a problem. This system will record DTCs in ECM if there is fault with the fans (bad enough is notices).

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Old August 18th, 2018, 19:29   #1848
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Join Date: Oct 2011
Location: Monroe, NY, USA

Originally Posted by The4ork View Post
Can't figure out how to post pics from my phone and Photobucket doesn't work anymore but the connector is burning up at the large ground pin.
I'm at a loss of what to do next. I'm starting to hate this car. What a ****ty engineered plug.
I'm thinking you may have a fan drawing to much power or a bad ground back feeding through the circuit.

Check the amperage each fan is drawing. Both should be about the same.

Check the ground connection on the left side of the fans.

Long shot, the body ground under the battery tray is the one going back to the battery. If it's bad anything that grounds to the body is bad.
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