two waterpump questions

[porsche356]

Car is a 2004 TT

one:

does the waterpump turn only when the engine is running, or also after turning the ignition on (not starting the engine). Reason I am asking is that I hear something turning (after turning the key) one is the fuelpump, but there is something else that is turning as well (in the engine bay) and stopping after a while. I think that this thing is broken (or nearly) and I would like to know what this is. I am guessing the waterpump, but if this one does not tunr unless the engine is running, this one is off the table.

Second: Where is the waterpump located?

Three (secret bonus question!): Is it hard to DIY a waterpump replacement?

Regards, frank

[GranburyChuck]

The water pump, alternator, and power steering pump are all attached to the single belt drive on the crankshaft. When you shut the engine off, and the crank stops spinning, all of these stop. You may be hearing the air injection pump, sounds kind of like a vacuum cleaner and only lasts a short while.

[porsche356]

Hi,

It sound indeed like a vacuum cleaner (good description). I do notice the sound sometimes when the engine is running? is this normal?

regards, frank

The water pump, alternator, and power steering pump are all attached to the single belt drive on the crankshaft. When you shut the engine off, and the crank stops spinning, all of these stop. You may be hearing the air injection pump, sounds kind of like a vacuum cleaner and only lasts a short while.

[mudman2]

Not so, the oil coolers run after shutdown for quite a while

Hi,

It sound indeed like a vacuum cleaner (good description). I do notice the sound sometimes when the engine is running? is this normal?

regards, frank

The water pump, alternator, and power steering pump are all attached to the single belt drive on the crankshaft. When you shut the engine off, and the crank stops spinning, all of these stop. You may be hearing the air injection pump, sounds kind of like a vacuum cleaner and only lasts a short while.

[porsche356]

hi Mudman2,

Thanks for the reply, but in this case, the engine is cold and I know for sure that it is not the oil cooler.

Thanks, frank

[wvicary]

There is an electric coolant pump that could be making the noise, there is a TSB on this issue.

[mudman2]

Pre flight

There is an electric coolant pump that could be making the noise, there is a TSB on this issue.