Plugs are the same, but are they interchangeable?

Hello guys, anyone know why everytime I put my ignition on my AC fan goes on. Radiator fan works well with thermostat but the ac fan is always on. Sometime I do not mind because I am always with my ac on but when I hava a cold weather. I do not need this fan to be on all the time. Perhas it is a relay. Anyone had this issue before? please advise. Thanks,   Ulises. 1987 Mitsubishi Starion ESIR. Owned since 1989

Not Mine!   Doesn't look bad for the price. Not sure if it's auto or 5spd. Aren't the 89's pretty rare?   http://hartford.craigslist.org/cto/4312729750.html   Starion - $1800 (New Britain)   http://images.craigslist.org/00f0f_dPDDHfeoidj_600x450.jpg   http://images.craigslist.org/00O0O_gQa0Q45KpRb_600x450.jpg   1989 mitsubishi starion Starion 89 automatic transmission odom. 89 sold with all equipment manual transmission 860-356-5212     -N8

This is my question I am attempting to stay in so called street form but lose some weight from my starion any suggestions? I really want to keep stock interior but if i has to go it has to go.