I have 89 Mercury grand mq, what sensor controls the idol when the a/c is on ?

I have 89 Mercury grand mq, what sensor controls the idol when the a/c is on ?I have 89 Mercury grand mq, what sensor controls the idol when the a/c is on ?
There is a relay called a W.O.T. relay. It stands for


Wide Open Throttle relay, this relay is designed to


shut off the a/c compressor under heavy accelerationto divert more power to the engine. There is also an I.A.C. valve,


(idle air charge) that also controls the engine idle. Hope this


will help.I have 89 Mercury grand mq, what sensor controls the idol when the a/c is on ?
T.P.S throttle positioning sensor?? my first guess