Okay so my heats not working and the auto zone gave me the wrong adapters for my car but I already took lines of I can't find the main plug for radiator to drain . I own a 1987 Mazda rx 7 and need to know if anyone knows we're it's at under the car any help would be great ful also the reason is I change and and flushed all systems before I even started the car this one slipped my mind . And now it's taken apart and my son put water in it trying to help while I was in the bathroom yay aga right not . Grrr . Frustrated father teaching my son some hands on .. Plus most of my tools are in the shop with my 2013 ats Cadillac . Getting fixed from someone hitting it gonna break a blood vessel lol..

 

If the radiator is factory then the drain plug is at the bottom and towards the end closest to the battery (driver side). It is plastic so be careful not to strip it. Iv'e always found that using the largest flat head screwdriver that fit worked better than the Phillips even though it's a Phillips plug.

 

I love this site it's most helpful I got it filled I just unplugged the sensor and the main hose underneath the radiator for now so I can get down to my fathers house to do a fix . I may need to buy a heater core for it does anyone know some prices on them and were I can find one for a 30 year old Mazda rx 7

 

NAPA will carry hoses for your car.

If you are changing the thermostat too,then get the OEM thermostat.(dealer)
Stant is crap.