Kind of hard to explain and describe the process. Recommend you purchase Haynes Repair Manual #36071 (1993-2005 Ford Ranger Pickups/ 1994-2005 Mazda Pickups) or check at your local library to see if there is one available. You will find all the steps plus illustrations on how to perform the job.
how du you replace a thermostat in Mazda pickup b2300 94
You can find the fuse box diagram for a Mazda b2300 pickup when you do not have the manual by writing or calling the manufacturer for the original manual.
where can you find fuse box mazda 1995 b2300
change stop brake light under foot pedal check fuses first
if it is a ford ranger,it may work because the masda got its body style form ford for that pickup
I found the owners manual for the 2003 mazda b2300 and it shows the fuses and what they are. http://www.manualowl.com/am/Mazda/2003-B2300/Manual/798
pull out one of the plugs, and if the threaded part is turning black from carbon then either clean them up or replace them
start with checking the coil packs wires sparkplugs
follow lower radiator hose back to engine.
No, this is not an interference engine.
go to www.drivetrain.com and find your particular vehicle
It can pull itself, and the driver. More than that it's really sloppy.