Skip the auto shop - Our mechanics make house calls

Q: Turned on back winow heater and engine made a noise ...when lights are turned on engine makes a noise like it can't take load ....

asked by on

Turned on back window heater to defrost and engine ade a noise like a motor bike was passing that when I start car it starts as normal but a vibration noise comes at the end of tge start ...that seems to be gone now .....if I turn on lights I get a noise from engine like it's not able for the load.....I have all heaters turned to low and them to off but hot very hot air coming from vents.....A/C has never worked properly it blows cold air out drivers side and warm out passengers so I don't really use it

My car has 117500 miles.
My car has a manual transmission.

A: Hi there. It appears you have more than one...

Hi there. It appears you have more than one problem with your vehicle. The noise coming from engine area with a load on the electrical system, may be a bad diode in the alternator. Continuing to drive the vehicle with a bad alternator diode, may leave you with a dead battery. The hot air coming from the vents sounds like blend door actuator(s) problems. I recommend the concerns your vehicle has, it be inspected by a certified technician like one from YourMechanic to pinpoint the noise and help you fix it accordingly.

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: Loud roaring sound from engine when accelerating

It sounds like you have an exhaust leak. An exhaust leak can cause a Check Engine Light. It will give the O2 sensors a false reading. The exhaust runs nearly the length of the car and consists of two catalytic...

Q: car shimmering a little and goes slow until you pass 20,000 miles

Hello. Engine performance issues such as trouble accelerating can be caused by a wide variety of issues. If the vehicle has not had a tune up in several thousand miles, it may be possible that a thorough tune up will...

Q: Car won't stay running

Sounds like you might be having an alternator problem. The vehicle uses the battery to start, once it is running the alternator takes over providing the vehicle with all the electricity it needs. If the alternator fails, the car continues...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.