Strange relay click

[Bubu]

I have a suspicion that the click which we all seem to have is the water pump starting. Although I havent actually listened to see when the pump starts, the following is why I suspect it to be the pump.

1. The 'click' happens after short period of time from starting the car. The car may not activate the pump so that it can warm up quicker by not flowing the water when its trying to warm it up.

2. The obove also aids in reducing emissions, because a car at operating temp produces less emissions.

3. When the click happens it appears to draw a bit of electrical power. I noticed my lights dim for a split second as the click happens. Not many things draw that much power in a car to cause the lights to dim for a split second, however a pump will draw enough current to cause the lights to dim.

I may have a listen to the pump on my next cold start to see if my suspicions are correct.

[Roodosutaa]

I have a suspicion that the click which we all seem to have is the water pump starting. Although I havent actually listened to see when the pump starts, the following is why I suspect it to be the pump.

1. The 'click' happens after short period of time from starting the car. The car may not activate the pump so that it can warm up quicker by not flowing the water when its trying to warm it up.

2. The obove also aids in reducing emissions, because a car at operating temp produces less emissions.

3. When the click happens it appears to draw a bit of electrical power. I noticed my lights dim for a split second as the click happens. Not many things draw that much power in a car to cause the lights to dim for a split second, however a pump will draw enough current to cause the lights to dim.

I may have a listen to the pump on my next cold start to see if my suspicions are correct.

Mmm the water pump is electric?? I thought those things are driven by the crank... but yeah what you said makes sense though if it actually is electrical - the revs dip as well so that might mean it's a big current draw as well.

[Bubu]

Mmm the water pump is electric?? I thought those things are driven by the crank... but yeah what you said makes sense though if it actually is electrical - the revs dip as well so that might mean it's a big current draw as well.

The water pump is electric on the Polo GTI. On most cars they are driven by the crank (attached to the pump via a belt).

[Spec83]

There are several clicks you will hear in a polo -

1. 35-45sec after starting - this is the air pump turning off after a cold start. I usually don't drive anywhere until this happens as I like to let the Pogo warm up a bit

2. When you press the brake pedal

3. When the electric fan on the radiator starts/stops

I am guessing that your clicking is Number 3

And the water pump is always running