Belt squeals when AC comp kicks in at startup - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 07-27-2010, 04:25 PM Thread Starter
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Belt squeals when AC comp kicks in at startup

Has anyone had this issue. The first time I start the truck in the morning, no issue. As the day goes on, each time I start the truck, the belt squeals when the AC compressor comes on, then after a few mins, it gets quiet and is fine till the next time I start it. Any thoughts? I heard that there was some kind of recall for noisy belts, but problem surfaced in cold temps, where i live it has been over 95 each day for the last month.
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post #2 of 11 Old 07-29-2010, 07:06 PM
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i have the same problem i am taking mine to the dealer to get looked at. i will post more on what i find out
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post #3 of 11 Old 07-30-2010, 11:23 AM
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Mine does the same thing. I figured it was normal, haha.

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post #4 of 11 Old 07-30-2010, 02:00 PM
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Mine did the same thing. It was the tensioner b
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post #5 of 11 Old 08-01-2010, 12:54 AM
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Mine does this all the time as well. It has done it since new, but has definitely gotten progressively worse. I never hear any squeaking in the winter, only when the truck bakes in the hot sun. If I start the truck, head down the road and then turn the A/C on, it squeaks horribly for a few seconds while the pump engages. Then it goes away. It's starting to drive me crazy, and people look at me wondering why such a new truck sounds like that

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So all that work and you're keeping the trash can of doom on the exhaust?


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post #6 of 11 Old 08-01-2010, 05:56 AM Thread Starter
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My truck looks exactly like yours, nice truck! Curious, why have you not taken it in for warranty? I bought mine used, and I have no warranty, so I am trying to figure out the repair before I blindly throw money at it. I find that mine only does it when it is hot as well. If I let it idle for a few minutes, the squeal will go away then it is fine. But yeah, I hate when it draws attention like that.
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post #7 of 11 Old 08-01-2010, 09:50 AM
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This is normal. My 6.0 does it now and then too. My friend with a 6.4 put a better belt on. His factory 09 was really dry. Get a goodyear!

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post #8 of 11 Old 08-01-2010, 10:25 AM
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I sent this in PM to dieselkane earlier:

Tensioners were problematic with the 08's... TYPICALLY the main belt tensioner, not real often the AC belt tensioner, but just because I haven't seen it, doesn't mean it can't happen.

Look up from underneath at the tensioners...make sure the pulley isn't leaning towards the front of the engine.

There was also a TSB on the idlers but that's for cold start squealing.

Also -- might be worth a try to do two things. 1: watch the AC compressor while someone cranks the engine. See if the clutch (the hub on the front) comes on during crank for a few seconds. This is called CASS or Compressor Anti Slugging Strategy. It's to prevent the accumulation of liquid refrigerant in the compressor after it sits (since the compressor is at the bottom). Also, after the truck sits, before you start it, reach up and turn the clutch with your hand (the hub on the front of it). See if it's tight to turn. This can indicate a failing compressor.

Aside from that, not much more I can think of offhand.

Hope this helps!

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post #9 of 11 Old 08-01-2010, 10:31 AM
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Thanks again man!

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Originally Posted by azkcr View Post
So all that work and you're keeping the trash can of doom on the exhaust?


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post #10 of 11 Old 08-06-2010, 05:09 PM Thread Starter
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With every good complaint, should come an equal good comment. I have put 6K on my (new to me) o8 with 50K on it. I love this truck. I tow trailer a lot and this truck has been simply awesome!!!! Got the Spartan, and no issues, except for the belt squealing. But this truck gets ton's of compliments and it pulls like a "Clydesdale",,Love this truck!!!!!!!
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