Skip the auto shop - Our mechanics make house calls

Q: My oil light does not come on when the oil is low, and the heater only blows hot air for a short time.

asked by on

I have 2 issues, the oil light and heater. My heater all of a sudden has quit working. When I turn on the heater, it will blow out hot air for about 20 minutes and then blow out cold air. Do you know what might be causing this? Another mechanic at a dealership said that if it was the thermostat, that a code would come up. I have recently had the codes read and the only thing coming up in the codes was for the Transmission Control Module, which I have an appointment to be replaced. I had recently asked a question about why my oil light does not come on when the oil is low. I have been so low on oil a couple times that my car has started to make noises before I realized what was wrong. I want to avoid this happening again. I was going to get the oil sensor changed, but the mechanic on here who responded to me said that my oil light does not work that way. How do I know if the oil sensor is bad? And when the oil is low? I cannot afford a diagnostics at this time. Thank you!

My car has 144000 miles.
My car has an automatic transmission.

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!
  • Home
  • Questions
  • My oil light does not come on when the oil is low, and the heater only blows hot air for a short time.

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: Oil light comes on when idle

I would recommend checking the oil level. Sometimes when an engine is just slightly low, the oil light may come on at idle simply due to the lack of oil pressure when the motor is not working as hard. Be...

Q: Have 2001 pt cruiser, temp running high?

First you will need to verify that the thermostat is opening when engine warms up. Then make sure the cooling system is full and that the cooling fans are coming on to prevent overheating. I all of these checks are...

Q: Loud rattling from rear

The information provided leads me to believe that the rattling noise you are experiencing in your Chevy Impala is the rear stabilizer end links failing. It can be difficult to identify a noise problem without physically driving and inspecting your...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...