Heating Issues

[jackyl]

I there.
I have some issue problems in my E30.
If i push the car, or i get some traffic, the temperature needle passes the middle,and in the traffic, it only lowers when the car is moving.

In the weekend i went to a trip around 25 miles, and i caught some traffic. The car had heated, (he didn´t passed the first mark after the middle one), a bit.
After i parked and went for a walk, when i return, there was some liquid from the radiator in the floor. the water came from the expansion tank, so i presumed the car got so hot that he had to release some water.

The car got a new water pump, and a new thermostat.
When i arrived at home, i´ve checked the hoses before and after the thermostat.They were both hot, so the thermostat isn´t closed.
What may be the problem?

The radiator has 19 years, and i don´t know the real condition about the radiator(if the radiator as rust and calcary(??) inside, could do a bad coolling?)

The fan behind the radiator rotates, and if i try to stop it with a screw driver, it doesn´t stop (to check the viscosity of the system??).


help?!

Thanks

[jackyl]

About the aux fan (between the radiator and the front grill), i´ve removed because, the fan wasn´t doing anything there, because she was jammed.
The metal bar that supports the fan was all twisted, making the fan jammed.

I´ve searched the forum, and after checking some post, could my problem be the radiator chocked?
Should i use some radiator cleaner?
This cleaner will not damage the entire system?

Thank you