2000 Audi S4 HFS-3 not spraying ::CORRODED PUMP::

[RusS4!]

Ok I tried bridgeing the two wires and nothing happens and I have 12V going to the pump. It is also grounded correctly.

[Richard L]

It appears the pump is not working. Can you tell me where the pump is mounted?

[RusS4!]

Yes, the pump is mounted to the crossbar where the stock sidemount intercooler use to be.

[RusS4!]

Is there anything I can do? I haven't had this system but a year? Or am I going to have to spend another $210 every year for a new pump?

[Richard L]

It appears the problem is pointing towards the water pump. The pump is not water proof.

The HFS-3 pump is designed to be trunk mounted. It is possible to mount it in the engine bay if the following precaution is taken:

1. The main source of water ingress is the cable gland at the back of the pump. Depending on how the cable is routed, water will run along the cable and end up inside the pump. A generous smudge of silicon sealant will minimize this from happening.

2. Put the pump head on top so water can only trickle downwards, away from the pump internals.

3. Water proof the pump relay assembly by put the entire assembly into a seal box. None of this assembly is designed to withstand the harsh external environment.

Was there any reason why you did not install the pump in the truck as illustrated in the user manual?

Before we jump to any conclusion, can you remove the pump from the car, disassemble it and post a few pictures here.

I have seen pumps failed in less than two weeks when installed externally.

[RusS4!]

Your right Richard, I mounted the pump in the engine bay not realizing the water pump is not water proof. I have also seen others mount their pumps of other brands in the engine bay without problems. I dont know how to take the pump apart. Do you have any instructions? Is there any way to get the pump rebuilt or do I have to buy a new pump?

[Richard L]

You need to undo five screws on the pump head and pull. That is all.

If the motor bearing is corroded, you need a new pump. I have listed all the preventative measure above to minimize this from happening in the future.

[RusS4!]

Hey Richard, Which 5 screws are you refering to? I unscrewd the 7 screws and all I see is a rubber shield that does not want to come off.
Thanks for listing the preventative measures for minimizing water problems but I am now just try to decide if it would be better to buy a new pump for $210.00+shipping or buy a different type of pump.

[Richard L]

Pull harder. It will come off. You need to cut back part of the label to expose the seam.

Until you disassembled it, don't buy a pump yet.