2004 V8 4Runner----bad fan clutch?

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  #1  
Old 06-25-15, 05:49 AM
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2004 V8 4Runner----bad fan clutch?

Yesterday, when I pulled in the parking garage at work, I could hear a weird sound reflecting off concrete. Not really a ticking, but more of a rattling sound. Car was hot. I tried to reproduce it this AM with truck cold and did not hear it.

When I arrived at work (engine hot), I heard it again. Not a roar...just a rattling sound from very front of engine. I opened hood, and everything looked fine. No wobbling of fan. Also, it does not overheat. If anything, it seems like it takes a fair amt of time to come up to temperature.

I shut off engine and restarted (engine hot). For a second, it sounded quiet, then there was a loud sound (click, snap) and the rattling started again.

Is that the fan clutch? If it is, is it hard to replace in V8? Is my water pump also shot?

Thanks.
Dave
 
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  #2  
Old 06-25-15, 06:02 AM
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When the car is off, grab the fan & rock it from front to back. Is there excessive play?
If it sounds like a bunch of marbles rattling, it could be the water pump.
 
  #3  
Old 06-25-15, 06:32 AM
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Sounds more like marbles. The weird thing is that when I first start the truck when warm, it is quiet. But after about a second, there is a loud noise and then the rattling begins.
 
  #4  
Old 06-25-15, 05:08 PM
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Marbles generally mean that it's the water pump. Rock the fan as I described before. There is probably some play, in the shaft.
 
  #5  
Old 06-25-15, 05:58 PM
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I just figured out that it only happens when AC is on. Not getting cool air either. Hopefully not big $$$
 
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Old 06-25-15, 07:48 PM
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That's a game changer. Then I would say that it could be the clutch on the AC compressor.
 
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Old 06-26-15, 02:03 AM
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Is there excessive play?
If it sounds like a bunch of marbles rattling, it could be the water pump.
 
  #8  
Old 06-26-15, 07:11 AM
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It is definitely the air conditioning. I hear a rattle/buzz from compressor area when the ac is turned on. The ac light is car is solid (does not flash). Makes rattling sound but no cold air. Would that most likely be bad compressor or clutch, or could it be low pressure or bad relay?

I'm wondering if low refrigerant pressure could be causing the clutch not to engage. Or does this sound most likely like a bad clutch?

Thanks
 
  #9  
Old 06-26-15, 07:28 AM
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From your description it sounds like it is engaging. Normally a low refrigerant condition will cause the pressure switch to disable the clutch from engaging. If it's engaging and the rattle is only there when engaged, then clutch should be okay.

Re: The water pump. Before checking play, take belt pressure off. Rattling could also be tensioner/idler pulley bearings.
 
  #10  
Old 06-26-15, 08:54 AM
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It is definitely ac. As it is only blowing hot air. I think clutch is trying to engage compressor and can't. There is no belt squeal (like from frozen compressor
 
  #11  
Old 06-26-15, 11:49 AM
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I'm really surprised the clutch engages if the charge is low enough to cause no cold air. If you feel the refrigerant lines with it engaged do you get hot/cold or just ambient?
 
  #12  
Old 06-26-15, 04:01 PM
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Here is what I tried:

Ran error codes in climate system...no error codes

With engine running, unhooked low pressure switch. Noise stopped. Jumped switch.noise returned

With engine off, was able to turn compressor clutch by hand

Applied 12v directly to clutch. Not able to turn at all.

Does it sound like compressor is seized? I don't get a squeal with it running. Just a weird rattling sound
 
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Old 06-26-15, 04:19 PM
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Does the belt look damaged in any way, burn marks, cracks, etc....?
 
  #14  
Old 06-26-15, 07:21 PM
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Not that I can see. Everything is pretty normal sounding with engine running until I turn on ac. The we get this rattling sound. Sounds like when an engine is knocking from low octane.
 
  #15  
Old 06-26-15, 07:30 PM
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Drive it with the AC off for a few days. See what happens.
 
  #16  
Old 06-27-15, 05:33 AM
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Hot/cold check on the refrigerant lines check?
 
  #17  
Old 06-27-15, 06:50 AM
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More experimentation:

Turned ac on high. Touched the tubing that is high pressure and the one that says low pressure near where Schroeder valves are. No real major difference in temp. Maybe I could convince myself that H was slightly cooler than L.

Looked closely at pulley on compressor. Put a Mark on it to see if it is turning. It is, in fact, turning (pulley is turning, not just the clutch).

Checked temp of air coming out of vents. Passenger 78, driver 80. Outside temp is 72 today.

Looked at sight glass. Small bubbles visible at idle with ac on. But if charge were low, wouldn't compressor not run?
 

Last edited by Dave4242; 06-27-15 at 08:59 AM.
  #18  
Old 06-27-15, 05:09 PM
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May be low, but not low enough to trip the pressure switch. I would try getting a little more charge in it and go from there. Bubbles in the sight glass generally indicate less than optimal refrigerant level.
 
  #19  
Old 06-27-15, 05:23 PM
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Would you recommend I DIY or go to a shop? I have a friend who has the gauges to check pressures. Will give that a try first. I believe the pressures are listed on a label under the hood.
 
  #20  
Old 06-28-15, 09:15 AM
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Mmmm, I don't recall that pressures are listed, but maybe. Thought it was just capacity of the system in pounds of refrigerant.

I generally recommend a specialty ac shop for ac issues although there are DIY refrigerant cans nowadays with built-in pressure gauges.
 
  #21  
Old 06-29-15, 09:37 AM
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So......I borrow a manifold gauge from a friend. Static readings are L-68, H-70. AC running L-0, H-80. It should be L-35, H-250-270. Ran in a can of R134a. Readings went to 33 and 230. Thought maybe I needed more and 12oz can had not been enough. Added some more from second can. With engine and ac on, L fluctuates between 28-32. High is about 175. Air is ice cold. Why couldn't I get reading beyond 33?
And does it seem like I have a leak?
 

Last edited by Dave4242; 06-29-15 at 10:04 AM.
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