You can find radiator flush coupons at any of the major quick lube/service areas. With winter approaching, this is the time of year when these shops take advantage of the average consumer’s concern that the antifreeze/coolant could be just a tad too old and should be changed. Some dealers, recognizing the importance of this “gold mine” to their bottom lines also advertise some of the lowest price coupons you are likely to find. The reason they can do this is that the chances are good they will find something else that has to be fixed, raising your costs substantially. You can find coupons at Midas, Meineke, AutoZone, PepBoys, Sears and Jiffy Lube.