Why does the blower keep running after pulling out the key?
3 Answers
The reason the blower keeps running is that the blower resistor is burned out, which is equivalent to a short circuit. Additional information: Reasons why the blower does not rotate: 1. The blower has been used for a long time, and excessive dust accumulation causes the friction coefficient between the rotor and the bearing to increase, resulting in the rotor being obstructed or even stuck, leading to overheating and damage of the coil. 2. There may be no 220V AC input or the coil may already be damaged. 3. Capacitor usage standards: For 30W～40W blowers, the capacitor is usually between 1μF～1.5μF; for 80W～120W blowers, the capacitor is often between 2μF～3μF. If the blower operates normally after replacing the capacitor, it indicates that the fault was indeed caused by a damaged capacitor. If the blower still does not function properly after replacing the capacitor, it is mostly due to damage to the internal starting coil of the blower, and only replacing the coil can resolve the issue.
Last week, my car's blower kept running after the engine was turned off, which really startled me. I parked the car, removed the key, but the fan was still roaring, like it was putting on a solo performance. There could be several reasons for this: the relay is the most common culprit—this little component tends to get stuck and fail to shut off when it ages; or the fan control module might be faulty, as it manages the on/off function; a short circuit is also possible, caused by loose or damaged wiring leading to erratic power supply; some cars have a delayed shut-off feature, but if it doesn’t stop after the set time, it’s abnormal. That time, I checked the fuse—it was fine; a gentle tap on the relay made it stop, confirming it was the issue. Not fixing it promptly could drain the battery or even cause wires to overheat and start a fire. I suggest you try pulling the blower fuse as a temporary fix to stop it, but don’t delay—get it professionally repaired ASAP. Drive the car to the shop for diagnosis; getting it resolved in one go is both convenient and safe. Don’t attempt DIY fixes on this kind of issue to avoid causing new problems.
After years of driving, I fear nothing more than minor issues escalating into major troubles. The blower still running after pulling out the key? Usually, it's a stuck relay or a faulty switch. Another possibility is a short circuit in the wiring, where damaged wiring harnesses cause continuous power supply. This is extremely dangerous: the battery can drain rapidly, leaving you unable to start the car; worse, overheating wires could spark a fire. Last time, a colleague mentioned a similar fault that ruined his battery, costing him unnecessary money. Safety first: check the fuse box with the engine off and try removing the fuse corresponding to the blower. If that doesn't work, don't hesitate—call a repair shop immediately. For routine maintenance, regularly inspect relays and replace them if they're aging. Delaying repairs not only damages your car but also wastes money and time. Addressing issues early is the real way to save. Only with a healthy electrical system can you drive with peace of mind.
