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Old 09-27-2005, 09:33 PM   #1
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Has anyone had a problem with their F250 PSD crewcab air conditiong making a high pitched whining sound when towing in heat?

It doesn't do it unless towing. It doesn't do it in cool weather. It does it on both Mountain and flat roads. Driving on Calif I-5 in the cool evening we had no problem but when we came home through the Shasta Mountains and South of Redding in the heat of the day (100 degree weather) it made the noise. We would turn the air conditioning off for a while and then back on. It would run a while and then begin the noise again.

Is the high pitched whining/roaring noise under the load of our 5er in the heat normal or will we cause damage by continuing to run the AC when it makes the noise?

We would appreciate any input before we take it in for repair.

Thanks,

Eagle 1
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Old 09-27-2005, 09:33 PM   #2
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Has anyone had a problem with their F250 PSD crewcab air conditiong making a high pitched whining sound when towing in heat?

It doesn't do it unless towing. It doesn't do it in cool weather. It does it on both Mountain and flat roads. Driving on Calif I-5 in the cool evening we had no problem but when we came home through the Shasta Mountains and South of Redding in the heat of the day (100 degree weather) it made the noise. We would turn the air conditioning off for a while and then back on. It would run a while and then begin the noise again.

Is the high pitched whining/roaring noise under the load of our 5er in the heat normal or will we cause damage by continuing to run the AC when it makes the noise?

We would appreciate any input before we take it in for repair.

Thanks,

Eagle 1
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Old 09-28-2005, 05:37 AM   #3
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Ours does not do that, I would have it checked out.
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Old 09-28-2005, 03:15 PM   #4
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My '02 Ford F350 Crew Cab doesn't do that. Maybe the serpentine belt is slipping on the AC compressor's pulley making the high pitched whining you're describing?

When towing, the under hood temperature may be higher, aggravating a slipping belt situation. When it's hot outside, the under hood temps could also be higher and the compressor may be presenting a higher load on the belt due to it working harder.

These are just some guesses, but it's a place to start. Also, if not the belt, maybe the belt tension idler pulley has a bad bearing, could be a bearing in the water pump too.

If you post your question on the "The Diesel Stop" forum, I'd wager you'd get a lot of feedback. Those guys live and breathe Fords.
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Old 10-06-2005, 09:33 AM   #5
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Sounds to me the noise you are hearing could be the engine cooling fan. It will normally not come on unless towing or using ac in the hot summer.
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Old 10-06-2005, 10:21 AM   #6
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I agree with George, the radiator cooling fan will clutch up to full lock when needed to provide extra air to radiator, AC condenser, transmission cooler, ect. The fan clutch is controlled by the truck's computer and gets input from several temp sensors, not just the antifreeze temp. so you might only see a slight increase or no increase on your not-so-accurate factory gauge before the fan engages. It is really loud. If it is doing it as your engine load increases on grades, getting rolling, hot weather ect... it is doing what it is supposed to do. It has a loud roar sound, but not real high pitched. The roar ramps up in intensity and after running for 20 seconds to several minutes, ramps back down in volume. A screech might be the belt slipping due to an overcharged AC compressor or an AC system that is partially stopped up causing high head pressure at the compressor. If anyone has ever put freon in it cause it was running hot without using AC gauges that may be the cause (too much freon). Someone with AC gauges can check the head pressures. You are not in warranty period for AC anymore (neither is my 2002) so I would avoid having Ford ckeck the AC (too pricey). IF you are mechanically inclined, investing in some AC gauges for about $60 is a way to go. Maybe a belt change is in order if it has never been changed. You can find charts on internet showing what the AC pressures should be. This site
http://www.thedieselstop.com/
has loads of info on their forums about our 7.3's. how to maintain and fix them. I'm on my first diesel, so I browse that site often.
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Old 10-06-2005, 04:08 PM   #7
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We appreciate the responses to our question and I will have the belt and fan cluth checked. George, you hit it right on the head, that is exactly when it happens, no other time. Anytime I am not towing, whether it is hot or not, it is fine. Just when it is hot and I am towing, whether it is level roads or not, the noise starts and we have to turn off the a/c and not run it for awhile.
Thanks for the input.
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