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Cooling fans not working correctly

Tiny
NEWMAN39US
  • MEMBER
  • 5 POSTS
There are 4 relays that are the same in the engine comparment fuse box. I moved them to different positions with no change to anything so I assumed that is not the problem. Also swapped the 2 fuses. Is there a good way to check relays?
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Friday, November 30th, 2018 AT 11:29 AM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Swaping is good with know good relay. Then PCM controls relay so need scan tool to check if relay is being activated
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Friday, November 30th, 2018 AT 11:29 AM (Merged)
Tiny
NEWMAN39US
  • MEMBER
  • 5 POSTS
I will have that checked. Thanks for your help
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Friday, November 30th, 2018 AT 11:29 AM (Merged)
Tiny
NEWMAN39US
  • MEMBER
  • 5 POSTS
One more question - when should the 2nd fan come on?
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Friday, November 30th, 2018 AT 11:29 AM (Merged)
Tiny
JOLMO
  • MEMBER
  • 2 POSTS
  • 2003 BUICK RENDEZVOUS
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 70,000 MILES
1) my high speed cooling fan does not turn on when driving or when I shut off the car and it starts to overheat.
2) I also looking for the location of the thermostat.
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Friday, November 30th, 2018 AT 11:29 AM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
With AC and if coolant rises above 220 deg. If AC is Auto maybe AC conroler telling PCM AC is on.
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Friday, November 30th, 2018 AT 11:29 AM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi jolmo,

Thank you for the donation.

Are the fans operating at low speed conditions?
Have you checked the cooling Fan relay # 2 and # 3?

Thermostat is located behind the housing of the outlet hose.

WATER OUTLET HOUSING REPLACEMENT

1. Remove the air cleaner and duct assembly.

2. Drain the coolant until the coolant level is below the thermostat.

3. Remove the crossover exhaust pipe.

4. Remove the radiator hose from the thermostat housing.

5. Remove the thermostat housing bolts and clean any sealer from the bolt threads.

6. Remove the thermostat housing and gasket.


https://www.2carpros.com/forum/automotive_pictures/192750_Thermostat03RendezvousFig68_1.jpg



7. Remove the thermostat.

8. Clean the mating surfaces.
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Friday, November 30th, 2018 AT 11:29 AM (Merged)
Tiny
NEWMAN39US
  • MEMBER
  • 5 POSTS
Perfect -thanks very much for your help. Have a great day!
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Friday, November 30th, 2018 AT 11:29 AM (Merged)
Tiny
JOLMO
  • MEMBER
  • 2 POSTS
Yes my fans are operating at low speed.
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Friday, November 30th, 2018 AT 11:29 AM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Here is a schematic of the cooling system. Check the fan relays 2 and 3.


https://www.2carpros.com/forum/automotive_pictures/192750_CoolingFan03RendezvousFig10a_1.jpg



https://www.2carpros.com/forum/automotive_pictures/192750_CoolingFan03RendezvousFig10b_1.jpg

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Friday, November 30th, 2018 AT 11:30 AM (Merged)
Tiny
CANDACE NICHOLS
  • MEMBER
  • 2 POSTS
The fans not coming on I think its a common ground I have ground to the left side fan but not to the drivers side fan and no ground to drivers side window as well I have no wiring diagram any clues?
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Friday, November 30th, 2018 AT 11:30 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Hello,

I have found this cooling fan wiring diagram (below) for you and a guide to help you get the problem fixed.

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

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please run some tests and get back to us so we can continue helping you.

Cheers, Ken

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Friday, November 30th, 2018 AT 11:30 AM (Merged)
Tiny
S_BRONSON
  • MEMBER
  • 1 POST
  • 2002 BUICK RENDEZVOUS
Cooling fans not operating when a/c not running. Car overheats and may or may not start when hot. Turns over at normal speed but won't crank. Vapor lock? Computer? Help!
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Friday, November 30th, 2018 AT 11:30 AM (Merged)
Tiny
XOWEY
  • MEMBER
  • 113 POSTS
Well first, the fans don't come on till the engine temp is around 130 F. If it's not going into the red, it's not really overheating. This issue, we need to address first, many people assume that their car is overheating if the temp goes high when they are working on it. How high does the temp go when you drive it?

As far as the no start. Under the vehicle there is a connector that plugs into the floor on the drivers side just behind the drivers seat area, check there for any green corrosion/
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Friday, November 30th, 2018 AT 11:30 AM (Merged)
Tiny
SHOCKY22
  • MEMBER
  • 2 POSTS
  • 2002 BUICK RENDEZVOUS
  • 6 CYL
  • AWD
  • AUTOMATIC
The Cooling Fans In My Vehicle Aren't Turning On And I Have Changed The Relay, What Else Could Be Causing Them To Not Turn On?
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Friday, November 30th, 2018 AT 11:30 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Check the sending unit and wiring.
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Friday, November 30th, 2018 AT 11:30 AM (Merged)
Tiny
JAMES GILLIS
  • MEMBER
  • 2 POSTS
  • 2005 BUICK RENDEZVOUS
  • 173,000 MILES
At idle engine temperature hits just above half way fans do not come on at all. Wired direct runs normal temperature. I was needing to know if and where the fan control sensor is located? Oh, it has new head gaskets water pump thermostat and radiator, before anyone asks. Lol.
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Friday, November 30th, 2018 AT 11:30 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
The engine coolant temperature sensor tells PCM when to put fans on check fuse and relay in under hood fuse box. But you did not put engine size so we cannot tell you where it is.
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Friday, November 30th, 2018 AT 11:30 AM (Merged)
Tiny
JAMES GILLIS
  • MEMBER
  • 2 POSTS
I am sorry it is a 3.4 liter V6.
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Friday, November 30th, 2018 AT 11:30 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It is by the thermostat housing on drivers side rear of engine. See picture.
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Friday, November 30th, 2018 AT 11:30 AM (Merged)

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