1990 cad deville 4.5L evapjob preformed on 6/10/97 gauges low=42 high=250 amb=90 center duct=49 clutch cycles on 45-50 sec off 15 sec when idling in gear or in park. on the road at any speed or steady speed clutch on= 10 sec off= 10 sec have enter a/c... Login to read more.