Mazda b3000 2001 heater works after one hour of running

6.5 hours. The dash has to come out.

Probably because the engineers put in some goof ball place that requires most of the dash to be torn apart to replace it.

does the blower motor run? Is it that you get no heat? check a few things. does both the heater core hoses get hot.? and it can also be a blend door motor

to remove the dash to get to the heater core is a ***** if you dont have mechanical experience dont try it. It will take about 4 hours to do the job and the dealer charges 600 dollars. go to a mazda repair site and check it out

your best bet is goto the local parts store and buy the 15.00 manual..it will give you detailed instructions...

For a mechanic that knows what hes doing, that job calls for a little more than 6 hours to replace the heater core.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

the best thing you can do is take it to the dealer. the blower motor has to come out through the glove box and there is a release ring that is on the driver side as well. it takes a trained mazda tech about and hour with out any problems. this is not a repair to try at home.

Theresa,

Plug in your car and listen for a "sizzle" sound. If you hear this then your block heater works.... if not..... Call Canadian Tire!

Find the location of the fan motor. Usually on the heater cowing by the firewall under the hood but could also be inside. 
Disconnect the wire leading to it and run a wire from the positive 12v(fuse panel or battery) to see if the motor runs. If it does not the replace motor.If it does run the you wil have to start testing other items suchj as the heater control switch.

Take the radiator to a radiator repair shop near you and have them acid bathe it and check it for leaks. It is possible that it could be full of stop leak.

From Haynes Repair Manual #36071, Ford Ranger Pickups 1993 - 2005 and Mazda Pickups 1994-2005 B2300, B2500, B3000, B4000: (1)Disarm the airbag system; (2)allow the cooling system to completely cool down; (3)using a thick cloth for protection, turn the radiator filler cap to the first stop; (4)step back and let the pressure release; (5)once the pressure has been released, completely drain the cooling system; (6) working within the engine compartment, loosen the ****,ps on the heater hoses at the engine compartment side of the firewall, twist the hoses and carefully sepseparate them from the heater core tubes; (7)plug or cap the heater core tubes to prevent coolant from spilling into the passenger compartment when the heater core is removed; (8)place a plastic sheet on the floor of the vehicle to prevent stains if the coolant spills; (9)remove the instrument panel; (10)remove the PCM heat sink and ground strap; (11)remove the heater plenum chamber; (12)separate the heater core from the heater plenum chamber; (13)installation is the reverse of the removal with the following additions; (a)fill the cooling system; (b)run the engine, check for leaks and test the heater