Q: Coolant light is on

asked by on

My coolant light is on. The diagnostic book describes this as a coolant fan malfunction.

The coolant temperature sensor may have a malfunction or your engine computer needs to be reprogrammed. The problem may occur when going through temperature extremes. The computer can sometimes read a rapid change of temperature which will turn on the coolant light. I recommend having the system checked for any leaks or low fluid levels first, then have the computer scanned for a code 2237. This code can be used to indicate a need to replace the coolant sensor and a computer reprogram if necessary by a qualified technician.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. Coolant light is on

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: Wired radio while driving car shut down

The cause of this malfunction is undoubtedly electrical in nature and perhaps includes blown fuses. Regardless of the underlying cause, if you request a no start diagnostic the responding certified mechanic will get the problem diagnosed and repaired for you...

Q: Car computer randomly beeps - 1998 BMW 323is

There are a number of driver-set functions which may cause the "3-beep" symptom: "top of the hour" clock warning (so you can catch the news), speed warning, icing conditions warning, etc. These are all set on the On-Board Computer. Check...

Q: Can't keep antifreeze in car

If your vehicle is losing coolant (antifreeze) you probably have a leak. I recommend having a trained technician, like one from YourMechanic, pressure test your cooling system to locate where the coolant is leaking from. From there, they will 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...
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 to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...