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In order to replace the heater core, the plenum box has to be removed and this is a major repair operation. Generally, you don't want to undertake this unless there is steam and water in the passenger floorboards.
Your model should just have coolant flowing directly into the core at all times. A simple check of the flow is to feel both heater hoses going into the firewall from a cold start. The hoses should warm up at about the same rate and get uncomfortably hot. This is a good indication that heat is getting into the passenger compartment.
If it appears that the core is getting hot, the next suspect is the blend door. This door diverts some or all of the air flow through the heater core and commonly fails on the Mountaineer/Explorer/Ranger/Mazda pickup...all of which use the same plenum box. The door is on a vertical axis and has a pervasive problem with the the plastic connection to the motor breaking. The door can swing back and forth randomly or wedge in a strange position, killing heat and AC efficiency. This is an expensive dealer repair, but there is an aftermarket repair kit from HeaterTreater that will address and solve the problem. Complete diagnostic information and diagrams are available.
What else can I help you with?
Where do you place and install the thermostat in a 1995 Mazda b2300?
how du you replace a thermostat in Mazda pickup b2300 94
Is there a diagram for a 1995 Mazda pickup b2300 interior fuse box?
where can you find fuse box mazda 1995 b2300
How do you find the fuse box diagram for a Mazda b2300 pickup when you do not have the manual?
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.
How do you find a diagram for the fuse panel on a Mazda B2300 pickup truck?
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
How do you repair a non functioning gas gauge in 1996 Mazda B2300 pickup?
you need to replace the gas gauge sending unit in the tank, or your gauge is broken
How do you change the 8 sparkplugs for a Mazda B2300 pickup?
pull out one of the plugs, and if the threaded part is turning black from carbon then either clean them up or replace them
How do you repair or replace a 1994 Mazda B2300 pickup truck 5 speed transmission?
If you have to ask such an obtuse question I suggest you just take to a local shop and have it done.
What causes a 1996 Mazda b2300 pickup to misfire?
start with checking the coil packs wires sparkplugs
Where is thermostat located in a 2003 Mazda B2300 pickup?
follow lower radiator hose back to engine.
Why did my heater ac stop putting out heat on my 2002 Mazda B2300?
Is your radiator fluid full?
How do you replace Front grill replace Mazda B2300?
You didnt specify what year.i have a 94 b2300 and had to replace the grill and in order to replace i had to take the front bumper off just to get to dome of the screws.so be prepared.
Will the piston hit the valves on a 97 Mazda B2300 2.3L pickup if the timing belt broke?
No, this is not an interference engine.
