The fan only works on its highest setting
A common complaint lands at the A/C desk even though the refrigerant is fine: the fan stopped working on low and medium. Turn the dial to the highest speed and air pours out. Every other setting gives nothing.
That pattern is usually electrical, not a refrigerant problem. On many vehicles the lower fan speeds are produced by a part called a blower resistor, or a blower control module on newer models. It reduces the power going to the fan motor. The highest setting often bypasses it and sends full power straight to the motor, which is why that one speed keeps working when the part fails.
A related pattern points the other way. A fan that runs on some speeds but cuts out, slows unpredictably, or makes a rubbing or whirring noise suggests the blower motor itself is wearing out.
Why it is worth fixing promptly
Living with high only is possible, and plenty of drivers do. The trouble is what often causes the resistor to fail in the first place: a blower motor that is drawing more current than it should as it wears. Replace only the resistor, and a tired motor can take out the new one. A check that looks at both is worth the extra minute.
It also matters for more than comfort. The same fan clears the windshield, and a fan that only has one loud setting is a fan the driver tends to switch off.
What to tell the store
- Which speeds work and which do not.
- Whether the fan makes any new noise.
- Whether the air is cold when it does blow, which tells the store the refrigerant side may be fine.
What the check covers
The blower, its resistor or control module, the wiring and connector, and the A/C system itself where cooling is also weak. The national A/C service page covers why a system that needs repeated recharging has a leak.
If the engine temperature climbs while the A/C runs, that is cooling system work, and a full check of the vehicle can be added through scheduled maintenance, both here.
Other stores nearby
Joplin and Osage Beach also offer A/C service.
About this store
The Springfield store runs nineteen services and is managed by Steve Richardson.
See the national A/C service page for all 33 locations.