Cooling fans are running all the time

MUDRULZ

MEMBER
2000 LEXUS ES 300
148,000 MILES

Have a 2000 es300 and replaced the battery and now the cooling fans start and run all the time. What could be happening at this point?

Monday, January 9th, 2012 AT 5:53 AM

8 Replies

CJ MEDEVAC

MECHANIC
11,004 POSTS

Hello,

It sounds like one of the cooling fan relays is stuck on here is the relay location with a guide to test them and the fan wiring diagrams so you can see how the system works.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please let us know what happens.

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Monday, January 9th, 2012 AT 7:05 AM

OXAMANDUHX

MEMBER
11 POSTS

Try the cooling fan sensor.

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Wednesday, February 8th, 2012 AT 9:20 PM

MUDRULZ

MEMBER
4 POSTS

Tried the cooling fan relays and the cooling fan sensor and the fans still run all the time even after engine is fully warmed up. Will the next step be to go to the dealership and have them put it on a computer? Thanks David

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Tuesday, April 24th, 2012 AT 4:09 AM

CJ MEDEVAC

MECHANIC
11,004 POSTS

It sounds like the ECM go hurt from a possible backward jump when the battery was low.

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Tuesday, April 24th, 2012 AT 4:32 AM

STAN 1

MEMBER
0 POST

I had this same problem, it was the ECM shorted out, got sued one for $80.00 all fixed.

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Wednesday, February 6th, 2019 AT 3:02 PM

NB2B

MEMBER
1 POST
1999 LEXUS ES 300

Electrical problem
1999 Lexus ES 300 6 cyl 100, 00 miles

I parked up my car after returning from lunch and returned to a dead battery. Further investigation revealed that the engine cooling fans were not shutting off and continued to run.

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Wednesday, February 6th, 2019 AT 3:02 PM (Merged)

RASMATAZ