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If the heater in a 2002 Grand Am only blows on settings 4 and 5, it likely indicates a problem with the blower motor resistor. This component controls the speed of the blower motor, and if it's faulty, it may only allow high speeds (4 and 5) to function while lower speeds (1, 2, and 3) do not work. Another possibility could be an issue with the climate control switch itself. Inspecting or replacing the blower motor resistor is a good first step to resolve this issue.
What else can I help you with?
What is wrong with your heater on your 2001 mercury grand marquis if it only blows cold air?
You are likely in an antarctic region.
Why would the heater in a 2002 Grand Prix only work on high?
Defective heater resistor pack.
2002 Oldsmobile Alero only blows warm air when heater is on and only when its on defrost?
Could be,a stuck open thermostat,low on coolant,plugged heater core,faulty temp blend door actuator,
Why would your heat only work on defrost?
ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air? ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air?
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blower motor resister is bad
2002 Pontiac Grand Am blows out only cold air what could be wrong?
vacuum line from intake manifold to control unit in dash broken or disconnected
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sounds like your belt is off or broke
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Typically a relay or resistor. But could be a blower switch or blower motor problem.
Your heater in your jeep only blows cold air why is this?
The most common reason a automobile heater blows cold air is the water level is low. Check the water level and fill to the appropriate level.
