Body Electrical

Resistor, Heater Blower - Land Cruiser 60 series - 24V - Front heate
This part is for 24 Volt models, such as some Canadian Spec HJ60s, and imported HJ61s.
87138-90A00
Denso:
146810-1550

Resistor, Heater Blower - Toyota Hilux & Hilux Surf/4Runner - 12V - Front heater

Is your heater only working on high speed only or one of the other speeds? Then it's very likely that you need to replace your heater blower motor resistor. It's easy to do,

Resistor, Heater Blower - Land Cruiser 70 series - 12V - Front heater (Denso)

87138-90K00
146810-3440

Resistor, Heater Blower - Land Cruiser 70 Series - 24V (Front)
87138-90K01
146810-3450