Fan clutch or water pump

Tiny
JOSE GONZALEZ2
  • MEMBER
  • 2002 GMC YUKON
  • 6.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 210,000 MILES
Changed the thermostat housing, coolant temperature sensor and did radiator flush.

When driving and the AC is turned on, after a short period of time especially going up a hill, vehicle starts to over heat. I need to turn off the AC and turn on the heat to bring down the temperature also when driving for awhile without the AC and making multiple short stops, when turning off the vehicle and turning back on the vehicle passing middle on the temperature guage then settles within seconds.
Tuesday, May 21st, 2019 AT 5:09 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Welcome to 2CarPros.

First, it is normal when the vehicle is hot, turned off, and then restarted for the gauge to be higher. That is because circulation in the cooling system has stopped and the coolant heats up.

Now, if the car doesn't overheat at highway speeds, then I would suspect the fan clutch. Here is a link that shows how it works:

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

With the engine off, see if it is easy to turn the fan. Do this when it is warm under the hood. It should be somewhat difficult. There should be a good drag when turning it. If it turns freely, replace it.

If you determine the clutch is bad, here are the directions for replacement. The attached pics correlate with these directions.

_____________________________________

Fan Clutch Replacement

- Tools Required
- J 41240 Fan Clutch Remover and Installer
- J 41240-5A Fan Clutch Wrench

Removal Procedure

picture 1

1. Remove the upper fan shroud. Refer to Fan Shroud Replacement - Upper (IMIO M74) or Fan Shroud Replacement Upper (WIM74).
2. Install the J 41240 to the fan clutch.

picture 2

3. Remove the fan blade.
4. Lay the fan blade face down on a workbench.

picture 3

5. Remove the fan clutch bolts from the rear of the fan blade.
6. Separate the fan clutch from the fan blade.

Installation Procedure

picture 4

1. Install the fan clutch bolts.
2. Install the fan clutch onto the fan blade.

Notice: Refer to Fastener Notice in Cautions and Notices.

3. Install the fan clutch bolts.
- Tighten the bolts to 23 Nm (17 ft. lbs.).

picture 5

4. Install the fan blade.

picture 6

5. Install the J 41240 to the fan clutch.
- Tighten the fan clutch nut to 56 Nm (41 ft. lbs.).
6. Install the upper fan shroud. Refer to Fan Shroud Replacement - Upper (W10 M74) or Fan Shroud Replacement - Upper (WIM74).

_________________________________

Let me know if this helps or if you have other questions.

Take care,
Joe
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Tuesday, May 21st, 2019 AT 8:07 PM

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