Re: 2000 Audi S4 HFS-3 not spraying
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.
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Richard L
aquamist technical support
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