Why Doesn't My Temp Drop? - Help!

[cavdo]

hey people, whats up?

I got a 1998 Ford Mustang GT 4.6L Convertible

I dont know if i did something wrong, but after i installed a 180 deg thermostat, the engine temperature didnt not seem to drop at all.

at first i thought its because i was in idle and the fan doesnt turn on untill 195 degrees(as far as i know), so i did some driving on the freeway. but the engine temperature does NOT seem to go down, it feels like i have never installed a low temp thermostat.

I even went with a 160 deg, didnt help either

i KNOW how a thermostat looks like, and i DO KNOW how to install it, I also KNOW that my temp gauge is working properly.

the only thing that I dont know is: "WHY DOESN'T MY TEMP DROP?"

- is there another thermostat in the cooling system?
- does the computer not allow the temp to be below the 190-195 deg range?
- is my cooling system busted?

i dont know what the problem could be, so please, any help would be appreciated,

thanks,
Avdo