Right now my fan is on the other side, inside to draw air.
BUT, If I put my fan towards the front of my car to push the air on the radiator,as the photo, will it be more effective for cooling the engine?

 

Less effective. The fan literally blocks off part the radiator. And the fan is designed to be a puller fan so it's not so good at pushing air through the radiator.

 

The fan blocks part of the radiator regardless of which side it's on.

But yes, it's most likely designed to be a puller, so even though that puts the electric motor in the stream of hot air which stresses it more and lowers its efficiency, it's probably more effective when mounted on the other side. There are some that work about the same either way though, so it might be worth a look at your particular fan's specs.

 

Most fan are better at pulling.

however that is a tiny *** fan.

IMO you need a fan that covers more of the radiator, plus,
you also need a shroud of some kind.

There was a test done years ago (I am sure there are many such tests) where fan performance with and without a shroud is done.
And the shroud always seems to double or triple the fans cooling ability when done right.

 

Always use a shroud, controlled air is always more effective than uncontrolled air

 

Now you'll see why the fan's are all put on the inside to suck instead of blow....

 

well. The fan placement whether superior or anterior is due to fan (i.e. blade) design.

There is a superior design for blower-type-fans that makes them less suitable for 'vacuum side'.

It has to do with where the pressure is being created, and which direction.
Imagine a turbo compressor wheel for example, being used to suck air. It would probably work but the engineers didn't spend hundred million dollars designing it on a computer model for it to do that sort of job. Sometimes a $13 part can have $$millions invested in getting it to work perfectly, to the point we don't even think about them. When a part does its job perfect nobody will notice. But you will still need to make sure you are using it properly for the job it was intended. Compressor bypass for example, designed to protect the compressor and you see them on the throttle-body still.

 

fans, blowers whatever, the only difference between suck and blow is which side of it you happen to be on. how well it works when it's sucking or blowing determines which side you want to be on

 

What I am saying is if you reverse the fan, you also reverse the vector forces on the surface of fan blade. The blades are designed to compress air in one direction only most of the time.