Skip the auto shop - Our mechanics make house calls

Q: Service engine light came on.

asked by on

Took the car to Auto Zone it read P 0128 coolant temperature low. I watch the gauges and it is usually at the first 1/4 mark on the temp. I have had trouble with the heater not blowing warm and the temp. dial not going above 65 degrees although sometimes it will turn to 90. Service engine light went off for a few days by itself but came back on again. The thermostat is very hard to change on this model. Do you think it could be the ect sensor or the thermostat?

My car has 155000 miles.
My car has an automatic transmission.

A: Hello, this code represents a slow acting t...

Hello, this code represents a slow acting thermostat getting to engine operating temperature which is about 195 degrees. The computer monitors the time to get to operating temperature, if it takes too long it will set this code. The issue could be the thermostat opening to quickly to circulate engine coolant. Low coolant level would also give this concern, that would mean the system has a leak. This would cause a cool operating and less heat to passenger compartment. The control panel for temperature would be a different concern. If you’d like, a certified Your Mechanic Technician can come to your location and inspect this condition. Please look at this web site for more information and service options. thermostat/low heat

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

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: The temperature gauge is almost in the red zone immediately after driving car.

Hello, thanks for writing in. There is definitely something wrong with your cooling system. If the coolant level is fine then it may be a failing thermostat or water pump causing the coolant not to flow through the engine. These...

Q: Car cranking, but not turning over

Hi, does the security light on the dash light when when turning the key and stay on after releasing it? Other Buick owners have had issues with the car not being able to verify the key and have replaced the...

Q: My car keeps having issues - 2003 Buick Rendevouz

Hello there, you have a few different faults going on with your 2003 Buick Rendezvous. If multiple lights come on and the car lacks power, the most likely cause would be an electrical fault. The most common electrical faults would...

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 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...
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...