Hello,

1997 T100 V6 4x4

My radiator fun stays engaged very long.
Temparature outside about 40.
Besides driving me nuts it takes extra energy from my engine.
And it takes more time for the engine to warm up.
The repair manual states fan clutch must be replaced.
Any advice you guys may have on this please?

Another solutions maybe? Like replacing the whole thing?

I have searched this forum but can find anything on this.


Thanks

Go back to the search feature and under Keyword search terms add the words +radiator +fan using plus signs in front of both words and a space between the two words. Then select the T100 & Tundra forum under Forums to search . In the date range set it to newer than 8 years. Under result format select 100 versus 25. This will bering up about 80 posts that mention eveything I've ever read over all these years. I went electric but it's not a real frugal option to chose. Search and you'll see what I mean. The clutch issue has been discussed numerous times. Good Luck. Brew <img src="/forums/images/graemlins/cheers.gif" alt="" />

Some fan clutches can be taken apart cleaned and refilled with oil, but the fastest way to fix is to replace fan clutch.

Mine does too and it drives me nuts. I think the clutches have 3 speeds. My thought is that it is engaging at full speed when it should be on low?

I also wonder about the water pump, any chance it could be getting worn out and not moving fluid fast enough allowing the system to run hot??

A number of cars do this on cold startup, not simply your truck. I've never researched it, but I suspect it's to help the engine warm up more quickly. It puts a good bit of load on the engine, which makes it work harder, which more quickly brings it up to temperature.

I replaced my fan clutch. It was driving me crazy. After the install, it was worth every penny! The hardest part of the install was the tight spaces with an end wrench ( 13mm I think). If you have a ratchet type end wrench, it would be a snap. Try it, you won't be dissapointed.

Fan clutch is "clutched" at start up because the oil inside settles due to gravity and falls into both chambers.

When operating, centrifugal force keeps the oil in one chamber until the thermostat opens, then it's able to flow into the other chamber to transfer power to the fan.

If it does not "declutch" then the thermostat is stuck or the little valve the thermostat works has been screwed up somehow. The thermostat is on the side facing the radiator, and it's usually an open coil that is free to collect lots of dirt and crud.

Check this out: http://www.nichols.nu/tip482.htm