from what I remember from past posts that there are two types of fans you can install.. thermostat controlled ones and electrical switch types.. I believe the general consensus was the thermostat controlled ones are the way to go.
Am I close on this. It's been awhile.

If his existing fan is working then adding another isn't going to fix anything.

The fan clutch should get harder to spin the warmer it is (with the engine off). If it's as easy to spin when cold as it is when the engine is hot then it's bad. It should never spin completely freely nor refuse to be moved by hand.

http://www.popularmechanics.com/cars...enance/1772922
http://www.ehow.com/how_5086903_test-fan-clutch.html

There's also the infamous newspaper diagnosis technique but I'm not going to advise that myself... You can find it on YouTube. It's safe enough unless you're an idiot or happen to get startled and throw your hand into a moving belt...

One final question, i want to bleed my cooling system (when i turn off the engine i hear a bubling sound coming from the radiator)...how should i do it? Is there any tutorials available??

Thanks in advance for your help!

i got a 87 turbo which came whith one electrical fan and the heavy mechanical fan, so i went to the junk yard and found a N/A 89 i belive and took the shroud and the twin electrical fans, i spliced a few wires, swaped the shrouds and now the fans work great. its was cheap easy and thankfully the 89 shroud can retrofit the 87

mine does the same thing as well. i put one of thes pressure caps whith the little pressure relive tabs on it when ever i release the pressure my overflow tank starts to gurgle and bubble. Doesent seem to hurt it any just wierd

Here is how to burp ur cooling system. Its in the FAQ. When i joined the forum i read almost all the FAQ's. It gives you alot of good info believe it or not.

http://www.toyota-supra.info/forums/...r-bubbles.html

This is the way that i know of on how to "bleed" ur system

Okay thanks for the info. Ill check out the faq's