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Lexus SC400 Heater Is Not Working

Learn if it's a simple fix or time to seek out a trusted technician.

What are common reasons my Lexus SC400 has heater problems?

While there are a variety of reasons your Lexus SC400 heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.
31%
of the time it's
Heater Blower Motor
24%
of the time it's
Thermostat
18%
of the time it's
Heater Blower Motor Resistor

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See what others are asking about their Lexus SC400. Get answers from RepairPal's community of auto experts and enthusiasts.
Well the display has always been dim since the day I got it,but it went out completely won't power on completely dead?

Related Lexus SC400 Problems

Find the most common driver-reported problems that are to blame when a Lexus SC400 has heater problems.
There are reports of intermittent failures with the heating and air conditioning control. The digital display might f...
There are reports of LED problems in the dashboard gauges. The lights burn out, making the gauges difficult to see at...

Lexus SC400 Heater Is Not Working Repair Symptoms

When the blower motor fails, the air conditioner and heater may still work, and heat or cool may be felt at the vents, but the air pressure will be dramatically decreased. This ...Read More
When the heater control valve fails, adjusting the temperature may not change the air temperature at the vents, whether hot or cold. Also, the valve could leak engine coolant, p...Read More
A failing heater core may cause a vehicle to smell of engine coolant inside the cabin. The majority of the smell will come from the vents while the heater is turned on, and from...Read More
A failing heater hose may cause the vehicle to smell of engine coolant under the hood. If coolant runs onto the heater core inlet or outlet, the cabin could begin to smell of co...Read More
A thermostat that is stuck open can cause the engine to run colder than normal and set the Check Engine Light. It may also cause poor fuel mileage and the heater to blow cool ai...Read More
When the blower motor resistor fails, the air conditioner and heater may still work, but heat or cool may blow from the vents on some of the fan speed settings. In some rare sit...Read More