Rattling humming noise:
- Faulty Blower Motor: The blower motor is responsible for circulating air through your vehicle's HVAC system. If it is faulty, it may produce a rattling or humming noise.
- Debris in the Blower Motor: Foreign objects such as leaves, dirt, or debris can get stuck in the blower motor and cause the rattling noise.
- Worn Out HVAC Bearings: The bearings in your HVAC system can wear out over time, leading to a rattling noise.
- Faulty Blend Door Actuator: The blend door actuator controls the flow of air from the heater and air conditioner. If it is faulty, it may produce a rattling or humming noise.
Smoke smell through vents when car is off and underneath the hood:
- Coolant Leak: A coolant leak can cause a sweet, burning smell to come through your vents and can smoke from underneath your hood.
- Overheated Engine: An overheated engine can produce a burning smell and may cause smoke to come from underneath your hood.
- Electrical Issues: Electrical issues, such as a short circuit, can cause a burning smell and may produce smoke from underneath your hood.
- Faulty HVAC System Component: A failing component within the HVAC system, such as a faulty compressor or evaporator, can produce a burning smell and may smoke.
It's important to have the issue diagnosed and repaired by a qualified mechanic as soon as possible to prevent further damage to your vehicle.
