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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 February 19th, 2012, 11:03   #1
Join Date: Apr 2011
Location: st louis
Default Cooling fans won't shut off

I came out of the house today and both cooling fans where running on my 2000 golf it hadn't been started yet and it's 32 degrees outside. I pulled the plug for the temp sensor on the drivers side of the radiator but they still won't shut off. Any ideas?
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Old February 19th, 2012, 11:18   #2
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Join Date: Nov 2007
Location: Vancouver, B.C.

I have the reverse problem, my fans wont come on at all. I think my problem is the fan control module which is probably the same problem you have. It is located under the battery or in that area. I have seen these pretty cheap online and very expensive at the dealership. You will need to get the number off the actual unit to ensure you get the right one.

Hope this helps.
1999 New Beetle TDI - Bosio 1019's, Malone S4, Skid Plate, Neuspeed Sway Bars, KW V2, 19's BBS-CH, Spyder LED's, EGR Delete, VF Mounts, South Bend Clutch, B&M Shift Kit, VNT17, Custom Side Mount Intercooler, HPA Big Brakes 355mm Ft/335mm Rr, 2.5" Custom SS Straight Through Exhaust, Colt Stage 2 Cam, 3 Bar Map.
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Old February 19th, 2012, 14:40   #3
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Join Date: Jul 2008
Location: Val-David, Qc
TDI(s): '03 Wagon

Run a search, the problem is well documented (both cases actually!)

The relay is indeed right below the battery, you need to be under the car to see it without removing anything (unless you still have a skidplate!)

If they don't work, check and see how difficult it is to turn them by hand. Mine were seized!
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Old February 19th, 2012, 16:15   #4
Join Date: Apr 2011
Location: st louis

I just pulled the fuse on top of the battery to shut them off,I should be okay in this weather and will pull the relays under the battery to get the # Off of them and get them ordered.
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Old February 19th, 2012, 19:25   #5
Sky King
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Join Date: Jun 2008
Location: Pearl River, LA
Fuel Economy: Under 40 with the Cam upgrade and Malone Tune

Mine came back from the dealer and the fans would not shut off. Of course, the dealer said that was normal. Even 3 hours later when they were still running. I just disconnected the battery overnight. When I reconnected the battery they did not come back on. Of course, when my wife brought the car back to the dealer, the guy made fun and acted like he was listening for the fans, knowing they were not running. My wife responded in kind. A couple of months later the guy got moved to another job. He was a true idiot.
2006 Beetle TDI
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Old February 20th, 2012, 08:10   #6
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Join Date: Jun 2010
Location: California... Novato... 25 Mi. N. of S.F.
Fuel Economy: ~35 mpg "as was" when purchased TDI

I suspect that the control function for one or both of these fans is actually both timer and relay...
probably both in the same component that are commonly called "fan relay" or two separate fan relays.
IF this was my DIY trouble-shoot/repair project, I would try to:
(a) determine the actual current loads there are when:
...... (1) the one fan is operating, and
...... (2) both fans are operating
(b) and then see if I could find out what the "continuous operating amperage"
rating is for the OE relay/relay(s) are.
IF these relays are not rated substantially higher than the actual amperage loads,
then this could mean the relay's power-on contacts stick closed and
then subsequently release due to cooling off or vibration!
--------------- Try this ---------
IF it stays on again... after you turn off the key and it has cooled some,
"rap" on the relay's outer case and IF the relay turns off in response,
well this is strong evidence as to what is happening!
You can purchase heavy-duty 50A, 100A & 200A industrial relays
for far less than what I suspect VW OE relays cost!
I did this to solve my repeated Glow Plug burn outs on my Mercedes 240D!
My last two 100A relays cost me less than $20/ea...
and I will be adding one of these to control
my new '81 VW Caddy P/U project car's GP system!
[IMPORTANT edit] - Keep in mind that these electrically controlled fans are
IMPORTANT in that they help to solve overheating and
damage to the aluminum heads that "percolate" when the engine is first shut down...
and the fan's continued operation is needed to reduce the
potential for warping or other damage to the weaker parts of these heads!
So don't let your zest to come up with a DIYer solution for "run-on" fans
end up costing you major engine damage!

Sam Ross
Son's 2002 Jetta TDI 01M / My '81 Rabbit "Caddy" project / My '80 240D MB...
Other Projects
: Safe Intake Cleanout / IP-QA Craniotomy /
Working on way for DIYers to more fully FLUSH 01M trans as well as check/"top-off" the O1M Fluid Level.
Perform diesel purge without ingesting troublesome air !

Last edited by MrSafety; February 20th, 2012 at 08:26. Reason: [edit] in Bright Blue!... [final edit] in Bright PINK!
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