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Engine & DrivetrainDiscussions about the engine and drivetrain of your vehicle.
This is a discussion thread titled "Fan Roars on Startup", within the Engine & Drivetrain forum, part of the Technical & Vehicle Assistance Forums category.
On my V6, the radiator fan always ROARS on startup. Even if the engine is cool. After a minute or so, it kicks off and the truck is relatively quiet (not as quiet as my tercel). Why does the fan kick on at startup?
On my V6, the radiator fan always ROARS on startup. Even if the engine is cool. After a minute or so, it kicks off and the truck is relatively quiet (not as quiet as my tercel). Why does the fan kick on at startup?
The fan clutch is locked. It takes a minute or two for it to release.
Mide does the same thing. If you do not like it.... and I do not either.... Go electric. Perm-a-cool and Flex-a-lite BOTH make a very nice product. All I wanna hear when I fire up the 'Yoda is V8.
SCDTRD
__________________ The Beast: 1994 Toyota Camry V6 XLE
The Mods:
Front tower Ractive Strut Bar, Whiteline rear AntiSway Bar, Rage Breaker 17.5x7 Rims and Falken Ziex 512 rubber, Limo Tint, Pioneer DEH 7700MP Head Unit, Polk 6x9 rear and Polk 6.5 Front speakers, Tokico struts front and rear, Carbon kevlar brake pads, Cryo treated rotors, ZEX 82021 N2O system, Polished and ported upper and lower intake runners, shift kit, and more to come.....and.... YES... it is a CAMRY....
the startup roar sounds like it's a standard toy thing...yes?
Well.. yea.. standard on any clutch fan engine. Any engine that has a clutch fan will do that on a cold start or after it sits for a while off.
SCDTRD
__________________ The Beast: 1994 Toyota Camry V6 XLE
The Mods:
Front tower Ractive Strut Bar, Whiteline rear AntiSway Bar, Rage Breaker 17.5x7 Rims and Falken Ziex 512 rubber, Limo Tint, Pioneer DEH 7700MP Head Unit, Polk 6x9 rear and Polk 6.5 Front speakers, Tokico struts front and rear, Carbon kevlar brake pads, Cryo treated rotors, ZEX 82021 N2O system, Polished and ported upper and lower intake runners, shift kit, and more to come.....and.... YES... it is a CAMRY....
the startup roar sounds like it's a standard toy thing...yes?
scdtrd knows more about it than me, it must be the clutch thing. My tercel doesnt do it, neither has the prizm, corolla, or other tercel that Ive driven.
scdtrd knows more about it than me, it must be the clutch thing. My tercel doesnt do it, neither has the prizm, corolla, or other tercel that Ive driven.
Those all have electric fans. No roar.
The Sequoia has it but not nearly as loud as the fan on the '98 Suburban I had. Totally ruined the V-8 sound on that rig.......and in my book nothing sounds better than the 5.7L Vortec.
On my V6, the radiator fan always ROARS on startup. Even if the engine is cool. After a minute or so, it kicks off and the truck is relatively quiet (not as quiet as my tercel). Why does the fan kick on at startup?
I would agree that the clutch is engaged when you start it up, but a minute or 2 for it to disengage seems a little long to me...the "cold" air it sucks into the engine compartment should make it disengage in a few seconds...it may be on its last leg if it doing this for "minutes"...
This is how the fan clutch is on the V-6, it even does it on my friends older Toyota PU with the 3.0 V-6. Someone awhile ago gave an excellent explination of how the fluid moves within the fan clutch when it has been sitting for some time. He explained that it was normal. My Tundra has done this from the very first day and hasn't changed. I will say it is more difficult to sneek out of a campground in the morning when the Dragon Roars at start up You won't notice it is much or for as long if the engine is warm.
This is how the fan clutch is on the V-6, it even does it on my friends older Toyota PU with the 3.0 V-6. Someone awhile ago gave an excellent explination of how the fluid moves within the fan clutch when it has been sitting for some time. He explained that it was normal. My Tundra has done this from the very first day and hasn't changed. I will say it is more difficult to sneek out of a campground in the morning when the Dragon Roars at start up You won't notice it is much or for as long if the engine is warm.
From car wizard web site:
"The fan clutch is a small fluid coupling with a thermostatic device that controls a variable-speed fan. The fan clutch ensures that the fan will rotate at just the right speed to keep the engine from overheating, and reduces drive to the fan when it is no longer needed.
The fan clutch has a fluid coupling partly filled with silicone oil designed for just that purpose. If the temperature of the air passing through the radiator rises, the heat alerts a bimetal coil spring to "uncoil" or expand. When it expands, it allows just a little more oil to enter the fluid coupling, so the fluid coupling starts to rotate the fan. If the air coming through the radiator is cool, the opposite happens; the coil spring contracts, the oil leaves the fluid coupling and the fan slows. Slowing the fan when it is not needed reduces fuel consumption, makes less noise and saves engine power.
Sometimes a flat bimetal strip spring is used instead of a coil spring; it bows out and in when the temperature rises and drops, letting oil in and out of the fluid coupling."
I would agree that the clutch is engaged when you start it up, but a minute or 2 for it to disengage seems a little long to me...the "cold" air it sucks into the engine compartment should make it disengage in a few seconds...it may be on its last leg if it doing this for "minutes"...
I tried it again today from cold, it was more like 20-30 secs. Sorry for the misinformation...
The fan is suppose to roar when you first start it up. Even if it sits a few minutes it will roar on start as the clutch chamber or turbine fills with oil causing it to engage. Once running it takes a minute or 2 for it to empty out unless the bi metal thermo is calling for cooling. But one thing good about it all is you know the clutch fan is working properly. If it doesn't roar something could be wrong. Also, its a big fan on the Tundra so it pushes a lot of air & will make noise & sound like it spinning at 100 miles an hour. Always neighborly, Coal Miner in New Jersey
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Fan Roars on Startup
You won't notice it is much or for as long if the engine is warm.
Linear Mode
