Electric cooling fan

[AxelB.]

Hi dudes,

 

I changed my rad today, and I had a little prob..

The small electric cooling fan plug took some coolant on it as I was bleeding the system, now the fan doesn't spin anymore (the one located near the main cooling fan, behind the rad).

 

I had a small ride to bring the car to my garage, it didn't overheat, everything seemed to be OK..

 

Can someone tell me what is the purpose of this small electric fan ? Is it big deal if it doesn't work ?.. Do I need to fix this issue urgently ?

Thanks in advance !

[Lee P]

It only comes on if the car gets to 97 deg or you turn the Ac on

 

Quick way to see if its working is unplug the Ac pressure switch or the temp sensor in the bottom of the rad

 

This will turn the fan on (ignition on as well of course)

 

Just to add, you don't need the cap off to bleed the system. Fill it to the top and put the cap on. Its self bleeding

[AxelB.]

Right, thanks a lot for your answer.

But, how can the rad be self-bleeding ? How does it work ?

[Benjy]

Right, thanks a lot for your answer.

But, how can the rad be self-bleeding ? How does it work ?

 

Pressure cap and expansion tank. The air goes past the cap into the expansion tank and bubbles to the top of the container which generally has an overflow on it (not air tight). When the engine cools, it creates a vacuum that pulls water from the expansion tank back into the cooling system, thus replacing the space previously occupied by the air.

[AxelB.]

Okay ! I knew the expansion tank was working with the rad cap in order to keep the rad full of coolant depending on the pressure, but I didn't know it would also act as a bleeding system.

Thanks !