My vehicle overheats especially with the A/C on?

Tiny
SUPERBOB2503
  • MEMBER
  • 2003 MITSUBISHI OUTLANDER
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 105,000 MILES
My vehicle overheats especially with the a/c on. I had to change the radiator and the thermostat. There are two fans mounted to the radiator only one works. Could this be the problem or what should I check next?
Saturday, July 12th, 2008 AT 11:59 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

An engine can overheat due to a number of reasons. It could be for having a faulty water pump, stuck closed thermostat, being low on coolant, inoperative cooling fan, bad radiator.

Having only one fan turn on can make the engine overheat, especially on hot summer days. An inoperative fan could be due to a faulty relay, malfunctioning control module, faulty wiring, bad fan motor. It can also be due to a bad coolant temperature sensor.

Since one of the fans is functional, it is not likely the relay or the temperature sensor.
So, the issue could be bad wiring, faulty motor or even the module.

You will need to check to see if there is power to the inoperative fan harness. If there is power, then the issue is likely the fan motor. You can also provide 12V power directly to the fan to see if it comes.

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

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.
Was this
answer
helpful?
Yes
No
Thursday, February 3rd, 2022 AT 11:18 AM

Please login or register to post a reply.

Sponsored links