Skip the auto shop - Our mechanics make house calls

Q: Check engine light and the engine is making a humming noise.

asked by on

My check engine light came on a month ago. I had it checked out by an auto part store that used the thing you plug into the spot under the steering wheel. They said it gave an evaporative cooling message. I took it in for an oil change with hopes they could look at the engine. They said I would have to make an appt. Since then my engine started to make a humming noise two days ago. Usually only when it's idling. Then tonight I get an a/c is not avaliable due to engine temperature warning on the display. I have a couple questions. Is it safe to drive for one more day till I have the appointment? Is it safe to drive to the appointment? Do you have any idea as to what may be the issue? And do you think a comprehensive warranty would cover the issue? Thanks for your time!

My car has 78000 miles.
My car has an automatic transmission.

The humming noise could be the air filter being dirty, the drive belt slipping, or the air conditioning clutch is slipping. It is safe to drive your vehicle to the appointment as long as there is no smells or loud noises other than the humming noise. Only a shop or a certified technician can give out a warranty for the replacement parts.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: What does the High Temperature indicator mean on the dash?

Your car’s engine creates a lot of heat during operation. Coolant is cycled throughout the engine to help prevent damage from that heat. If the High Temperature indicator on the dash comes on, it means that the computer has detected...

Q: What would cause brand new O2 sensors to give codes 172, 173, 176, and 177, rich and lean conditions, both sides at the same time?

When it comes to across-the-board codes being set such as this, it is usually a result of something "upstream" creating the condition to set all these codes. For instance, it is rare for both O2 sensors to fail at exactly...

Q: AC blowing hot air

There are two possible scenarios that could be causing your problem: As crazy as it sounds I have had low refrigerant charge in the AC system cause this, so it may just be that your AC needs to be...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...