Skip the auto shop - Our mechanics make house calls

Q: Knocking sound from beneath the glove compartment

asked by on

My car has around 93,000 miles. When I turn on the a.c., there is a knocking noise that sounds like it is under and back of the glove compartment area. This is a pre-owned car and I keep having to replace parts. Now this. What do you think the knocking sound is?

A: Behind the glove box is the cabin air filte...

Behind the glove box is the cabin air filter, blower motor and AC mode actuators. Any of the mode control actuators, such as the blend or mode actuators, can cause the knocking noise when the gears inside them fail. A qualified technician such as the ones at YourMechanic will have little trouble diagnosing this noise issue.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Air conditioning has died

Hi, it sounds like it could be the pressure transducer or a leak in your A/C system.  If the transducer goes bad then it will cause the A/C not to engage. If there is a leak in the A/C system,...

Q: need help with my car I don't know what to do or how to fix it please help

Hi there: In most cases, an engine knock is caused by cylinder head hardware being loose (such as valves, lifters or rocker arms), low oil levels or loose belts or pulley's that power many of the vehicle's components. If the...

Q: Hummer not making any noise when cranking

If your vehicle is not starting, but the battery is okay, that may be a sign of several other possible problems. There may be a problem with the starter, with its electrical system, or perhaps a problem with the ignition...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.