Mechanics

HIGH SPEED COOLING FAN

2003 Buick Rendezvous

Engine Mechanical problem
2003 Buick Rendezvous 6 cyl Front Wheel Drive Automatic 70000 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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Jolmo
September 27, 2010.



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.


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



7. Remove the thermostat.

8. Clean the mating surfaces.

KHLow2008
Sep 27, 2010.
Yes my fans are operating at low speed.

Tiny
Jolmo
Sep 27, 2010.
Here is a schematic of the cooling system. Check the fan relays 2 and 3.


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



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


KHLow2008
Sep 28, 2010.