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Both radiator fans stopped working/ fan relay

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
The information you read about vehicle has to be running for the fans to work is wrong. In fact it is the reverse, up to a certain point. When vehicle is not moving, the coolant in radiator would heat up as well and this would require the fan to work to reduce the heat of the coolant.
When vehicle is moving, air flow is able to help cool the radiator resulting in less use of the cooling fans.
Do the fans come on when A/C is turned on?
When does the overheating occur?
Do you have coolant losses issues?
Is lower radiator hose very much cooler than the upper hose?

Radiator fans are controlled by the engine computer via signals from the Engine Coolant Sensor and if the fans are not coming on, it could be a faulty computer.
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Wednesday, March 27th, 2019 AT 6:23 PM (Merged)
Tiny
GMAREK
  • MEMBER
  • 3 POSTS
Oh alright. Figured that didn't sound right.
As for the fans going on when the A/C is turned on that would be a negative.
It hasn't overheated on me (yet)
After I did the radiator flush I drove the vehicle for about two hours my first stop was around 40 min mark of driving and the car did not overheat or anything then another 40 mins or so temp was not out of normal.
There is no coolant loss. As for the hoses they are both warm.
I went ahead and checked the thermostat and it seemed to be clogged as soon as I removed coolant and water was purged from the gasket.
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Wednesday, March 27th, 2019 AT 6:23 PM (Merged)
Tiny
HOLLYWOOD1A
  • MEMBER
  • 3 POSTS
  • 1989 NISSAN MAXIMA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 14,500 MILES
Radiator fan doesn't turn on and thus my car overheats. Could this be the radiator cooling fan motor that doesn't work? Or do I have to replace the entire radiator fan?
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Wednesday, March 27th, 2019 AT 6:23 PM (Merged)
Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Hello,

Does your vehicle have 1 or 2 fans? Also do you have A/C? If so turn the A/C on, do the fans come on? If so most likely it is your Coolant Temp Sensor. It is locate on the front of the engine in thermostat housing.

.
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Wednesday, March 27th, 2019 AT 6:23 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
When the coolant temperature is low, the thermostat would be closed and minimal amounyt of coolant can flow through.

From your description, I don't see any problem with the cooling system. During cold starts, it would take anywhere between 20 to 45 minutes for the fan to come on depending on weather conditions. Start engine and let it idle. As long as temperature does not go up, keep engine running until the fan comes on.

When the A/C compressor is running, the fans must be working otherwise you risk the A/C sytem building up excessive pressure and can rupture hoses if they are not in good condition.
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Wednesday, March 27th, 2019 AT 6:23 PM (Merged)
Tiny
HOLLYWOOD1A
  • MEMBER
  • 3 POSTS
The vehicle has 2 fans. I have tried turning the AC on but the fans still don't work.
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Wednesday, March 27th, 2019 AT 6:23 PM (Merged)
Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Sorry, for delay in responding.

Ok, do you know the location of the Radiator Fan Relays? They are located in the Relay Box on drivers side in engine compartment... You will need to check them... Here is a diagram...


https://www.2carpros.com/forum/automotive_pictures/188069_89maximaRadfanrelays_1.jpg



Check out the link below for relay testing....

https://www.2carpros.com/how_to/how_do_i_check_a_relay.htm

If relays test good then try straight wiring from battery to fan plug.

.
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Wednesday, March 27th, 2019 AT 6:23 PM (Merged)
Tiny
JAHBAR
  • MEMBER
  • 1 POST
  • 1995 NISSAN MAXIMA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 143,000 MILES
My radiator fan wont go off when the car is idling. When u first crank it up. It warms up normal, the fan will come on and off like norm for a few mins. But if leave it idling for about 20mins I notice the fan dont go off at all.I know this is not normal because it use to go on and off beofore I replace the engine. Also I notice it idle about 1000rpm, is that the norm for a 95 maxima. Another issue im having is I think I have a gas leak. When I first replace the engine, I drove it for about 10miles and the engine light came on. Had it check and it was cyl 2 was misfiring. Took it back to the mechanic and he replace the injectors with the ones on the old engine. The light hasn't come back on. But now I smell gas when it idle, and at time it idle irregular. I kno its a bad gas leak cause the mileage im getting now is really bad. Plus the strong rich smell. We look for physical signs of leaks but could not see any. What could be cause this leak and how can I find it?
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Wednesday, March 27th, 2019 AT 6:23 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi jahbar,

Idling should be below 800 rpm, 1,000 is too high.

Check you EVAP system for disconnected hoses rgarding the fuel smell.

If the radiator fans does not stop, either there is not enough coolant in the system, faulty fan switch or a partially stuck thermostat.

If AC is on, fans would not stop unless compressor cuts.
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Wednesday, March 27th, 2019 AT 6:23 PM (Merged)
Tiny
DAYSLEEPNIGHTOWL
  • MEMBER
  • 1 POST
  • 2000 NISSAN MAXIMA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 159,000 MILES
Where is the radiator fan motor located and how difficult is it to replace. I'm sorry that I am not able to donate any money because I don't use credit cards. I thank you in advance for your time.

Robin
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Wednesday, March 27th, 2019 AT 6:23 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
The radiator fan motor is attached to the end of the fan, if you find the radiator fan, it will be bolted to the radiator fan shroud on the inside of the engine comprarment, just unbolt it and disconnect the wire connectors and pull the motor out, job=done.
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Wednesday, March 27th, 2019 AT 6:23 PM (Merged)

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