After I discovered my coolant leaking a couple of weeks ago, my local dealer diagnosed a faulty water pump, which was replaced, only for the same problem to re-occur at the weekend. They have told me there's a secondary water pump underneath the intercooler which has also failed. Can someone who knows more about what's under the bonnet of an S4 than me confirm that there are indeed 2 separate pumps? What's the purpose of having 2?
Cheers
Two water pumps?
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gavsteryoung
- 4th Gear
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Pete,
There certainly is a secondary water pump, but I'm not sure it's the same as the one your dealer is referring to. It is an electric pump and it is situated in the 'V' of the engine. It's job is to reverse circulate the coolant when it is very hot, in order to dissipate any air bubbles which form as a result.
If the dealer said the pump is under the intercooler then he is either confused or there was a communication problem (or he is just wrong!). The intercoolers (there are two) are located at the front of the car and fairly low down. There really isn't any room below them for anything, and even if there was I can't see the point: It may be tight in the engine bay, but not that tight!
There certainly is a secondary water pump, but I'm not sure it's the same as the one your dealer is referring to. It is an electric pump and it is situated in the 'V' of the engine. It's job is to reverse circulate the coolant when it is very hot, in order to dissipate any air bubbles which form as a result.
If the dealer said the pump is under the intercooler then he is either confused or there was a communication problem (or he is just wrong!). The intercoolers (there are two) are located at the front of the car and fairly low down. There really isn't any room below them for anything, and even if there was I can't see the point: It may be tight in the engine bay, but not that tight!
2001 Silver S4 Avant
AmD remap, APR R1 DVs, APR bipipe, Full Miltek exhaust
H&R coilovers, AWE DTS, Porsche front brakes, Short-shifter, 18" RS4 replicas
Defi-HUD boost gauge / turbo-timer (with afterrun pump modification), Phatbox
AmD remap, APR R1 DVs, APR bipipe, Full Miltek exhaust
H&R coilovers, AWE DTS, Porsche front brakes, Short-shifter, 18" RS4 replicas
Defi-HUD boost gauge / turbo-timer (with afterrun pump modification), Phatbox
You have:
A main water pump which is driven off the toothed cambelt. This is what is used to pump coolant
when you are driving the car.
A secondary waterpump. This is electrically operated and cools the engine, based on a thermostat,
after you have switched the car off. This is located on top of the engine underneath the near side
engine cover (UK).
AFAIK there are no waterpumps underneath any intercoolers.
A main water pump which is driven off the toothed cambelt. This is what is used to pump coolant
when you are driving the car.
A secondary waterpump. This is electrically operated and cools the engine, based on a thermostat,
after you have switched the car off. This is located on top of the engine underneath the near side
engine cover (UK).
AFAIK there are no waterpumps underneath any intercoolers.
MY 2000 S4
Ebony Pearl
Stage 3 (MRC 400 (ish))
Apexcone 50w HIDS
Ebony Pearl
Stage 3 (MRC 400 (ish))
Apexcone 50w HIDS
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