SPONSORED LINKS

Radiator Fan P0128 code?

Tiny
LEOMN21
  • MEMBER
  • 2003 MITSUBISHI LANCER
Check engine light is on p0128 code thermostat mal. Ok. Im a student im just learning this. My fan is always on when I start the car. And also after my car has been on and I turn it off I realize the fan goes on and off on the on position like if the car was running what can cause this problem?
SPONSORED LINKS
Wednesday, June 24th, 2009 AT 8:48 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

That code P0128 is related to the coolant temperature sensor.

DTC P0128 : Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

It is likely that the coolant temperature triggering the fan to run for longer than it supposed to.

You might find these articles helpful:

https://www.2carpros.com/articles/how-a-coolant-temperature-sensor-works

https://www.2carpros.com/articles/how-an-electric-cooling-fan-works

I have attached the diagnostics for that code as well as coolant temperature testing procedure for you reference.

Please let me know of any questions.

Thank you.
Images (Click to make bigger)
Thumb
Thumb
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Tuesday, August 3rd, 2021 AT 7:03 AM

Please login or register to post a reply.

Related Cooling Fan Content

Radiator Cooling Fans
GUIDE
Radiator Cooling Fans
The engine cooling fan is designed to move air through the radiator when the vehicle is at slower speeds or stopped. This air flow removes heat from the coolant created by...
VIEW MORE

Sponsored links