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  #1  
Old 12-07-2016, 04:58 PM
sghsmorgan sghsmorgan is offline
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Default Truck accelerates loudly - Thought Fan clutch, but not

I thought my fan clutch had gone out, because my truck has been louder than normal while accelerating (normal RPMs). It sounded like the fan was just running completely, so I thought it might be the fan clutch. However, I can turn the fan freely when the truck is turned off.

It has done this before in cold weather, before it warms up, so I didn't pay much attention to it. However, even on warm days, and after it's been running, it will continue to make this noise.

I know my Heater Control Valve leaks, could that be part of the problem? I've also suspected a bad thermostat for sometime, but haven't replaced it yet. Could that cause this issue?
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  #2  
Old 12-12-2016, 09:27 PM
sghsmorgan sghsmorgan is offline
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  #3  
Old 12-12-2016, 10:13 PM
63merc 63merc is offline
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Quote:
Originally Posted by sghsmorgan View Post
I thought my fan clutch had gone out, because my truck has been louder than normal while accelerating (normal RPMs). It sounded like the fan was just running completely, so I thought it might be the fan clutch. However, I can turn the fan freely when the truck is turned off.

It has done this before in cold weather, before it warms up, so I didn't pay much attention to it. However, even on warm days, and after it's been running, it will continue to make this noise.

I know my Heater Control Valve leaks, could that be part of the problem? I've also suspected a bad thermostat for sometime, but haven't replaced it yet. Could that cause this issue?
I don't think the control valve or a bad thermostat would make it louder. Could be the fan clutch. They shouldn't spin freely, there should be some resistance.
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Old 12-12-2016, 10:14 PM
stateranger stateranger is offline
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Default Re: Truck accelerates loudly - Thought Fan clutch, but not

The clutch may be going bad. Are all the vacuum lines connected.
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  #5  
Old 12-13-2016, 07:18 AM
tomw0 tomw0 is offline
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Default Re: Truck accelerates loudly - Thought Fan clutch, but not

If you slowly leak out the coolant from the heater control valve, the engine may be getting hot. The gauge may not show the increased temperature as the sending units need to be submerged in coolant to read the temperature properly.
Check you coolant level, either in the radiator tank, or in the 'degas' bottle if you have one. The former should be very close to full when cool, if it has a coolant recovery tank(99.99% do, to my knowledge). The latter between the low and high marks.
tom
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  #6  
Old 12-15-2016, 11:23 PM
sghsmorgan sghsmorgan is offline
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Originally Posted by tomw0 View Post
If you slowly leak out the coolant from the heater control valve, the engine may be getting hot. The gauge may not show the increased temperature as the sending units need to be submerged in coolant to read the temperature properly.
Check you coolant level, either in the radiator tank, or in the 'degas' bottle if you have one. The former should be very close to full when cool, if it has a coolant recovery tank(99.99% do, to my knowledge). The latter between the low and high marks.
tom
I have the reservoir, it sometimes leaks to below the minimum line, but I don't usually let it get to that. It makes the noise regardless of the coolant level. Engine temps stay on the colder side when it's cold outside, I think my thermostat is stuck open.

----------

Quote:
Originally Posted by 63merc View Post

I don't think the control valve or a bad thermostat would make it louder. Could be the fan clutch. They shouldn't spin freely, there should be some resistance.
How much resistance are we talking? I could turn it with my hand, but I don't remember exactly how much resistance, but it wasn't hard to turn.

----------

Quote:
Originally Posted by stateranger View Post
The clutch may be going bad. Are all the vacuum lines connected.
Vacuum lines are connected, I think. Maybe the bad heater valve that has a leak is causing the vacuum to leak. Would this cause other issues? How could I test this? Im about to replace the valve, I guess I can go from there.
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  #7  
Old 12-16-2016, 07:59 AM
tomw0 tomw0 is offline
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Default Re: Truck accelerates loudly - Thought Fan clutch, but not

If you try to spin the blades on a fan clutch, you should not get more than 1/2 turn. At least I can't get more than that. If it free-wheels more than that, I doubt it is still good.
The test I read of is to run the engine at idle, during hot weather, and wait. After the engine heats up, the coolant gauge getting above normal, you should hear the fan 'kick in' and make a lot more noise than normal. With a 4, you'd likely have to have the A/C engaged to develop enough heat to make it engage. In cool weather, the 4 barely puts out enough heat for the heater, though a good thermostat will get the coolant to 195F.
tom
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  #8  
Old 12-16-2016, 09:46 AM
sghsmorgan sghsmorgan is offline
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Quote:
Originally Posted by tomw0 View Post
If you try to spin the blades on a fan clutch, you should not get more than 1/2 turn. At least I can't get more than that. If it free-wheels more than that, I doubt it is still good.
The test I read of is to run the engine at idle, during hot weather, and wait. After the engine heats up, the coolant gauge getting above normal, you should hear the fan 'kick in' and make a lot more noise than normal. With a 4, you'd likely have to have the A/C engaged to develop enough heat to make it engage. In cool weather, the 4 barely puts out enough heat for the heater, though a good thermostat will get the coolant to 195F.
tom
I think my problem is that the clutch is always engaged, not the other way around. That would cause the noise, right? It sounds like fan is running full blast as soon as I start it, and like you said, it doesn't get hot.

I'll try it some more today
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  #9  
Old 12-18-2016, 10:45 AM
sghsmorgan sghsmorgan is offline
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I changed my heater control valve and fiddled with my fan a bit. Has some resistance hot and cold. No cracks in the fan. Air intake is snug, air filter is fine, I can't find out what's making that noise.
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  #10  
Old 12-19-2016, 08:11 AM
Soledad Soledad is offline
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Default Re: Truck accelerates loudly - Thought Fan clutch, but not

Could you maybe get a video of it and put it on youtube for us to see/listen to? A clutch fan that runs all the time will make a roaring sound during acceleration.

Here's how to test your fan clutch:

************************************************** ****
Fan Clutch Test

1. Spin the fan blade by hand. A light resistance should be felt. If there is no resistance or very high resistance, the minimum and maximum fan speeds must be checked as follows:

Fan Clutch Test-Minimum Speed Requirement

1. Use a suitable marker to mark the water pump pulley, one of the fan blade retaining bolts and the crankshaft pulley.
2. Connect a tachometer to the engine.
3. Install a throttle adjusting tool.
4. Connect a digital photoelectric tachometer.
5. WARNING: To avoid the possibility of personal injury or damage to the vehicle, do not operate the engine until the fan blade has been first examined for possible cracks and separation.

Start the engine and run it at approximately 1,500 rpm until the normal operating temperature has been achieved.

6. Adjust the engine speed to 2,300 rpm.
7. Operate the digital photoelectric tachometer at 3,000 rpm and aim it at the water pump pulley. Adjust the engine speed until the light flash and the water pump pulley mark are synchronized.
8. Aim the digital photoelectric tachometer at the fan blade bolts. Adjust the strobe light until the light flash is synchronized with the marked fan blade bolt (the fan blade appears to stand still).
9. The fan blade speed must not be greater than 1,500 rpm at 3,000 water pump rpm.
10. Turn the engine off.
11. If the fan blade speed was greater than 1,500 rpm, install a new fan clutch.

Fan Clutch Test-Maximum Speed Requirement

1. Carry out Steps 1 through 5 of the Fan Clutch Test-Minimum Speed Requirement.
2. NOTE: The temperature should be above 96C (205F) for maximum fan speed.

Block off areas on each side of the radiator in the engine compartment and the front of the radiator grille. This will raise the temperature of the air striking the fan clutch and should cause the fan blade to operate at maximum speed.

3. Place the climate control function selector switch in the MAX A/C position and the blower motor switch in the HI position.
************************************************** ****
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Last edited by Soledad; 12-19-2016 at 08:15 AM.
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  #11  
Old 12-20-2016, 05:05 PM
sghsmorgan sghsmorgan is offline
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Quote:
Originally Posted by Soledad View Post
Could you maybe get a video of it and put it on youtube for us to see/listen to? A clutch fan that runs all the time will make a roaring sound during acceleration.

Here's how to test your fan clutch:

************************************************** ****
Fan Clutch Test

1. Spin the fan blade by hand. A light resistance should be felt. If there is no resistance or very high resistance, the minimum and maximum fan speeds must be checked as follows:

Fan Clutch Test-Minimum Speed Requirement

1. Use a suitable marker to mark the water pump pulley, one of the fan blade retaining bolts and the crankshaft pulley.
2. Connect a tachometer to the engine.
3. Install a throttle adjusting tool.
4. Connect a digital photoelectric tachometer.
5. WARNING: To avoid the possibility of personal injury or damage to the vehicle, do not operate the engine until the fan blade has been first examined for possible cracks and separation.

Start the engine and run it at approximately 1,500 rpm until the normal operating temperature has been achieved.

6. Adjust the engine speed to 2,300 rpm.
7. Operate the digital photoelectric tachometer at 3,000 rpm and aim it at the water pump pulley. Adjust the engine speed until the light flash and the water pump pulley mark are synchronized.
8. Aim the digital photoelectric tachometer at the fan blade bolts. Adjust the strobe light until the light flash is synchronized with the marked fan blade bolt (the fan blade appears to stand still).
9. The fan blade speed must not be greater than 1,500 rpm at 3,000 water pump rpm.
10. Turn the engine off.
11. If the fan blade speed was greater than 1,500 rpm, install a new fan clutch.

Fan Clutch Test-Maximum Speed Requirement

1. Carry out Steps 1 through 5 of the Fan Clutch Test-Minimum Speed Requirement.
2. NOTE: The temperature should be above 96C (205F) for maximum fan speed.

Block off areas on each side of the radiator in the engine compartment and the front of the radiator grille. This will raise the temperature of the air striking the fan clutch and should cause the fan blade to operate at maximum speed.

3. Place the climate control function selector switch in the MAX A/C position and the blower motor switch in the HI position.
************************************************** ****
I'll try to get the video. It certainly sounds like a roaring to me. When I'm driving, it's louder than. My engine during acceleration.

I don't know if I can get so that test. Don't have the equipment.
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  #12  
Old 12-21-2016, 10:38 AM
cowboybilly9mile cowboybilly9mile is offline
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Default Re: Truck accelerates loudly - Thought Fan clutch, but not

Phototachs (non-contact tachometer) are really great when the need arises, I've used them myself several times working on vibratory conveying machinery but the thing is, most people don't own one (me included) because they will probably never have a use for it and good ones aren't cheap. OP, if you can get one great but if you can't........just take off the serp belt, drive a couple blocks and see if you have the same sound. If you don't then you know it's a clutch issue, if you do have the same sound, then it's something else. Quick and dirty test.
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  #13  
Old 12-21-2016, 11:17 PM
sghsmorgan sghsmorgan is offline
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Quote:
Originally Posted by cowboybilly9mile View Post
Phototachs (non-contact tachometer) are really great when the need arises, I've used them myself several times working on vibratory conveying machinery but the thing is, most people don't own one (me included) because they will probably never have a use for it and good ones aren't cheap. OP, if you can get one great but if you can't........just take off the serp belt, drive a couple blocks and see if you have the same sound. If you don't then you know it's a clutch issue, if you do have the same sound, then it's something else. Quick and dirty test.
My grandfather actually suggested this the other day. Belt seems easy enough to remove, I'll try it
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  #14  
Old 12-22-2016, 05:06 AM
Convict1997 Convict1997 is offline
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Default Re: Truck accelerates loudly - Thought Fan clutch, but not

I wouldn't go too far. Without the belt, your water pump won't be turning so you won't get an accurate read of the coolant temp. You could end up overheating the motor and not even know it until it's too late. Personally, I'd pull the belt off and start it up in the driveway. If the noise you're hearing is coming from the fan clutch, you'll know immediately since you won't hear it. Don't even have to drive anywhere.
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