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How to Replace the Heater on a 1992 Mazda B2600

The heater in the 1992 Mazda B2600 is a radiator that uses hot coolant from the engine to heat the cab of the truck. The procedure for replacing the heater is the same for all Mazda trucks made from 1987 to 1993.

Instructions

1

Disconnect the negative battery cable with a socket wrench to ensure the engine doesnt start while replacing the heater. Put a drain pan under the radiator, and open the drain plug. Allow the coolant to drain from the radiator, and replace the drain plug.

2

Disconnect the shield for the water valve on the heaters left side with a socket wrench. Detach the coolant hoses from the heater, and remove the housing for the control cable from its mounting clip on the heater. Disconnect the cable wires from the heaters crank arms. Detach the electrical connector from the fan motor.

3

Remove the glove compartment with a socket wrench to provide clearance for the heater. Disconnect the retaining nuts for the heater that are inside the glove compartment. Detach the defroster ducts from the heater, and pull the heater from the dashboard.

4

Mount the new heater to the dashboard, and align the mounting studs on the heater with the corresponding holes in the dashboard. Fasten the mounting nuts for the heater, and attach the defroster ducts to the heater. Attach the control cable for the defrost door for the heater to the crank arm.

5

Turn the upper control lever to the heat position, and push the crank arm for the heater towards its mounting clip as far as possible. Attach the cable housing to the clip, and fasten the clip to the heater with a socket wrench.

6

Attach the control cable for the water valve to the lever for the water valve. Set the heaters control lever to the hot setting, and push the crank arm for the lever as far towards the mounting clip for the control cable as possible. Fasten the screw for the clip with a socket wrench.

7

Insert the control cable for the recirculation door into the doors crank arm. Bend the cable, and fasten it into place with the retaining screw. Move the center control lever to the REC setting, and push the crank arm for the recirculation door toward the mounting clip as far as possible.

8

Attach the housing for the recirculation door cable to its clip, and fasten the retaining screw for the clip with a socket wrench. Connect the electrical connector for the fan motor. Attach the coolant hoses to the tubes on the left side of the heater, and fasten the hose clamps. Connect the shield for the heaters water valve with the retaining screws, and install the glove compartment.

9

Replace the coolant in the radiator, and reconnect the cable to the negative battery terminal with a socket wrench. Check for coolant leaks, and ensure the heater is functioning properly.

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