Should A Fan Clutch Spin When Hot

30.06.2022

Fan Clutch Replacement - Popular Mechanics.
Should a fan clutch spin when hot.
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Should A Fan Clutch Spin Freely When Cold [Answered].
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I put increasing pressure on the fan and stopped it within 3-4 seconds. Does this mean the clutch is bad? A few side notes... 1. Truck does not run hot in anyway.. actually runs a little on the cool side. 2. When I try to spin the fan with the truck turned off.. it does not free wheel. If I really try, I can get it spin about 1/2 turn.

Should a fan clutch spin when hot.

As mentioned, the fan clutch is engaged once the engine heats on the far side of the specified limit. The fan won't begin spinning unless the temperature device records high engine temperature. So, if you're having a hassle with obtaining the fan clutch to interact then it's probable that the temperature device isn't working properly. Proper placement of the fan in the shroud should have the blade about 2/3 out of the back of the fan shroud. Mechanical fans discharge a lot of air centrifugally, and many mechanical fans were specifically engineered to discharge air centrifugally. Whatever spacer you are using, make sure there is a fan clutch at the end of the spacer.

Mechanical Fan Lock-Up Temperature - Hot Rod Forum.

In the morning, the fluid has set for some time and it is naturally stiff. After running, the fan should be loose because the vehicle forward speed has forced air across the radiator and has unlocked the clutch. After sitting a while it should get stiff again. The fan will always spin when the engine is running. Most cars with electric fans will turn on at least one fan when the ac is on. You can test the fan clutch by observing the fan while the engine is running at a fast idle and the temperature is climbing. It will get to a point where it should come on. If it doesn't the temp will keep on rising towards the hot zone of the gauge. The way I diagnose a fan clutch is pretty simple. Start with the car off. Jiggle the fan forward and back. If there is any play at the clutch shaft, its bad. Give the fan a spin. It should move freely, but stop almost instantly, as if the clutch were filled with mashed potatoes. Start the engine.

Should A Fan Clutch Spin Freely When Cold [Answered].

It sounds like your fan clutch is siezed up. It is spinning the fan full speed all the time. The roaring noise you hear is simply the normal sound of the fan moving huge quantities of air through the radiator. When the fan clutch is operating normally, it loosens up much of the time and the fan is nearly freewheeling. As the temperature rises, the clutch gets engaged, and it allows the fan to circulate the necessary air for cooling the engine. Whether the engine is hot or cold, if you can spin the fan clutch freely, it is a symptom of a failing fan clutch. If it is alright, there should have been enough resistance not to allow it to spin freely.

2007 A/C pressure and fan clutch - Ford Expedition Forum.

The clutch is tightish, but will spin about 3/4 of a revolution when cold.... A GM viscous coupled fan clutch should "roar" for a few seconds when the car is first started and soon quiet down. A properly working one will then engage and "roar" depending on underhood temperature.... Shouldn't 'howl' until the thermal unit gets hot enough. 1,609 Posts. #4 · Jan 16, 2008. streetfrog;488839 said: With a fan cluthc your fan will rotate constantly regardless. The clutch engages and locks the blade to it so that it spins faster than normal the hotter that it gets. The only time that your fan will not spin is when the motor is off. PROPER DIAGNOSIS PROCEDURE: Start with a cold engine. The thermal fan clutch will be engaged for a short period of time during engine warm up. This length of time depends upon the duty and/or specifications of the vehicle tested. When air temperature is sufficient enough to activate the bi-metallic spring, the fan clutch should engage.

Fan Clutch Failure Modes and Troubleshooting | GMB Blog.

42 Posts. Discussion Starter · #1 · Apr 27, 2017. I had an a/c problem that I just sorted out, ended up being a broken wire in the engine harness going to the high pressure switch. The fan started intermittently engaging even when engine was cold, but not its always on. I did swap out the clutch for a new one while i was working on the a/c. First, get the engine to operating temp. b/c the fan clutch needs to soak up enough heat off the radiator to expand the coiled wire inside the housing in order to apply enough resistance / tension for the clutch to lock up. next, get a thick section of newspaper and roll it. start engine and keep it at idle. At what temperature does a fan clutch engage?. How to tell if a fan clutch is bad? - GMC Truck Forum. How to tell if fan clutch is bad? - The Diesel Stop. Fan Clutches - Davies Craig. Should a Fan Clutch Spin Freely When Cold or Hot?. How do you check a viscous fan clutch? - FindAnyA. May 25, 2010 There is a thermal element in the clutch.

Slight cooling issues and how to tell if fan clutch is bad?.

A thermal fan clutch is a fluidic clutch containing a heavy fluid. much like a torque converter works, as the impeller spins, the fluid creates drag on the housing. this friction causes the fluid to heat and eventually the clutch will lock into a 1:1 speed ratio with the water pump. if the clutch loses fluid, it is possible to lock in a cold and unbalanced state. the added vibration and. When the engine is off and cool enough to touch, a mechanic should be able to grab the fan and spin it only with reluctance. There should be no wobble laterally (front to back, toward and away from the radiator) in the fan clutch. A bound clutch is also a sign of problems. Any fluid leaking from the fan clutch is a sure sign of a broken clutch. Turn on the fan, stand directly under the fan blades and watch the ceiling fan spin. The blades will spin the opposite direction of a clock. Looking for a more telltale sign? You should feel a cooling breeze while standing under the fan. If you do not feel air movement, the fan is spinning clockwise. Don't confine your comfort to indoor spaces.

Clutch fan never really spins fast at... - E46 Fanatics Forum.

Joined Mar 3, 2011. 12,148 Posts. #7 · Aug 21, 2014 (Edited) The fan clutch should allow the fan to be turned by hand much easier cold than when the engine is at operating temperature. Where you may get 2 or 3 revolutions spinning by hand when cold, you shouldn't even get one when hot.. 4 10-22-2021, 07:45 AM. (10-22-2021, 03:59 AM)TallersDiesel Wrote: You should hold the fan pulley steady and then unscrew the fan clutch nut in COUNTERCLOCKWISE direction. Fan clutch nut is right hand (normal) thread. This applies too to 2003-2010 Ford 6.0 Diesel Powerstroke. I don't do many clutches but how do you hold the fan pulley or any.

Fan clutch | Off Roading Forums.

Should the fan clutch spin freely when hot? When the clutch is hot, it should engage with the drive portion and become immovable by hand. If your clutch is spinning freely when the engine is hot, that means that the clutch failed in the closed position. Summary. The viscous fan clutch is a surprisingly interesting piece of engineering.

How to Tell If Your Fan Clutch Is Going Bad - LiveAbout.

To get specific the fan clutch is responsible for determining the speed at which the cooling fan spins against the vehicle's radiator. Depending on what's wrong with your fan clutch, it may stop spinning all together or it may just not spin at the right speed. What this means is that the engine won't properly be cooled.

How to check cooling fan clutch? - Toyota Nation Forum.

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When the water pump shaft is spinning at low and idle speeds, the clutch will spin the fan at about a 1:1 ratio. During high speed rotation the silicone fluid within the fan clutch reduces its ability to spin the fan at full speed and the energy transferred from the water pump shaft, through the clutch to the fan is reduced. I use the 2705 and Flex-O-Lite 18" 5718, equivalent to that fan you listed, might even be the same fan. You don't want to use the 2747 clutch with either of those fans. Since its a heavy duty it'll spin the fan at 90% or more of engine speed and those fans are rated for 4000 RPM fan speed. A standard duty clutch will spin the fan at around 60%.

Fan Clutch-or-no Fan Clutch, When An Why | Hot Rod Forum.

I spun the fan with the engine cool and turned off. It rotates smoothly and quietly but there is definitely some resistance. If feels like a fluid coupling or gummy bearing grease. It does not feel like a solid friction. In contrast, I remember a fan clutch on a friend's car spinning freely with no resistance whatsoever.

How to Test a Fan Clutch | Hot Rod Forum.

9,598 Posts. #3 · Jun 27, 2015. Only show this user. Reno72 said: Spins freely with a cold motor, should have resistance when the motor is warm. Click to expand... It depends on how it was during shutdown. If the fan was engaged when shut off, the viscous fluid will still be in the chamber making the fan harder to turn. Adjust the strobe light until the light flash is synchronized with the marked fan blade bolt (the fan blade appears to stand still). The fan blade speed must not be greater than 2,000 rpm on 7.3L engines. Turn the engine off. If the fan blade speed was greater than 2.000 rpm on 7.3L diesel engines, install a new fan clutch (8A616).