Home Technical Discussions Audi TT 2000-2006

Audi TT 2000-2006 Cooling Fans Operation


Permlink Replies: 4 - Pages: 1 Threads: [ Previous | Next ]
Last Post: Jul 20, 2009 4:11 PM Last Post By: hankgood
hankgood

Posts: 6
Registered: 08/16/07
Cooling Fans Operation
Posted: Jul 11, 2009 8:33 AM
  Click to reply to this thread Reply
Have done research on the operation of the two fans on my son's 2000 1.8 but can't seem to get a clear idea of how they work under normal operation. If someone could explain it would be greatly appreciated.

Questions:

Do both fans work in tandem? The only definite pattern I know is that the passenger side fan will start when the AC is started.

Neither fan is running when the car is warm and idling with the temp gauge at dead centered or as it moves to one notch towards warm.

I understand that they are two speed fans - is speed increased according to coolant temp?

Thanks
FKH161

Posts: 7,661
Registered: 12/29/05
Re: Cooling Fans Operation
Posted: Jul 11, 2009 12:46 PM   in response to: hankgood in response to: hankgood
  Click to reply to this thread Reply
The fans are controlled via a radiator fan switch, as well
as by the Coolant Fan Control Module.

The fans should operate together.

There is a fuse on top of the battery, check if it is blown
or if the fuse contacts are burnt... it is the first green
30amp fuse from the left (there should be three).

Attached image is from a VW, but will look similar in your
application.
hankgood

Posts: 6
Registered: 08/16/07
Re: Cooling Fans Operation
Posted: Jul 12, 2009 10:07 AM   in response to: FKH161 in response to: FKH161
  Click to reply to this thread Reply
All fuse are OK.

My Conclusions:

Since drivers side fan is not operating when the other one is with the A/C on the fan must be bad.

I have not been able to get the fans to come on without having the A/C on. The temp gauge is not going past halfway (no overheating) but I assume they are not being signaled to start by either the Radiator Fan Switch or Coolant Fan Control Module and they should be replace.

Thanks
FKH161

Posts: 7,661
Registered: 12/29/05
Re: Cooling Fans Operation
Posted: Jul 12, 2009 12:45 PM   in response to: hankgood in response to: hankgood
  Click to reply to this thread Reply
Before you buy new fans... trigger them directly at their
harness plug connectors. Disconnect the harness plugs and
attach a jumper wire from battery negative to the ground
wire of the fan harness plug and then a positive wire to
either speed wire of the plug.

If one ore more speeds don't work on either fan, replace
the fan(s).
hankgood

Posts: 6
Registered: 08/16/07
Re: Cooling Fans Operation
Posted: Jul 20, 2009 4:11 PM   in response to: FKH161 in response to: FKH161
  Click to reply to this thread Reply
Fan tested bad.

I have found several VW/AUDI part numbers for the large fan (345mm) at wildly varying prices. Are all of these part numbers interchangeable?

# 1J0 959 455D
  1. 6X0 959 455F
  2. 6X0 959 455A

Thanks

Point your RSS reader here for a feed of the latest messages in all forums

Popular Discussions:
No popular dicussions.