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GMC Sonoma Heater Is Not Working

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

What are common reasons my GMC Sonoma has heater problems?

While there are a variety of reasons your GMC Sonoma 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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GMC Sonoma Repairs and Prices
All costs based on RepairPal Fair Price Estimate™ averages. Actual prices may change depending on final diagnosis.

GMC Sonoma 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 the car's interior to smell like engine coolant. The smell will become worse when the heater is turned on. The engine may also begin to run hotte...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
The bad thermostat can cause two different sets of problems, depending on whether it's stuck open or stuck closed. A thermostat that is stuck open can cause the engine to run c...Read More
When the blower motor resistor fails, the air conditioner and heater may still work, but air may blow from the vents at only some of the fan speed settings. If the resistor isn...Read More