Strange AC compressor buzz/grind issue
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Joined: Apr 2018
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Strange AC compressor buzz/grind issue
Hey, all!
as the temperatures here in florida continue to clime, as they do... Ive noticed a stange issue with my air conditioning.
It started off simply NOT cooling at idle, the air wouldnt be HOT, but ambient at best... I read a little and someone mentioned the clutch fan is inefficient and to install a pair of Mk VIII efans.
Ordered these and while waiting, decided to just do some checks on everything else. With a gauge on the low side piping Im getting about 45psi from the ac line. Seems nominal. The compressor appears to be engaging wheb the AC or “auto” button is used on the HVAC controls. Again though, NO cool air at idle, though it cools nicely while moving.
I did notice though, while in park, if you bring the RPMs up to ANYTHING beyond idle (such as 1200rpm) the compressor will spin and buzz LOUDLY (like a gameshow buzzer) for about a second and then disengage. This occurs about once every 3 seconds, continuously, on and off with the buzzing occuring whenever the compressor engages, and almost immediatly shutting off. My condensor and evap are both new. All else seems factory.
Any thoughts here? Is it an air gap thing? Theres no pings or other sounds at all... just that nasty sounding buzz, almost a grind sound.
Thank you!
as the temperatures here in florida continue to clime, as they do... Ive noticed a stange issue with my air conditioning.
It started off simply NOT cooling at idle, the air wouldnt be HOT, but ambient at best... I read a little and someone mentioned the clutch fan is inefficient and to install a pair of Mk VIII efans.
Ordered these and while waiting, decided to just do some checks on everything else. With a gauge on the low side piping Im getting about 45psi from the ac line. Seems nominal. The compressor appears to be engaging wheb the AC or “auto” button is used on the HVAC controls. Again though, NO cool air at idle, though it cools nicely while moving.
I did notice though, while in park, if you bring the RPMs up to ANYTHING beyond idle (such as 1200rpm) the compressor will spin and buzz LOUDLY (like a gameshow buzzer) for about a second and then disengage. This occurs about once every 3 seconds, continuously, on and off with the buzzing occuring whenever the compressor engages, and almost immediatly shutting off. My condensor and evap are both new. All else seems factory.
Any thoughts here? Is it an air gap thing? Theres no pings or other sounds at all... just that nasty sounding buzz, almost a grind sound.
Thank you!
Elder User
Joined: Aug 2018
Posts: 579
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From: Riverbank, CA.
Get a rebuilt or new Motorcraft. Don't skimp on it. I did, and I regret it now. Mine works okay, but not nearly as good a stock unit.
Senior User
Joined: Oct 2018
Posts: 379
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From: Texas
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Joined: Aug 2002
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From: Southern California
Motorcraft YCC355 A/C Compressor Assembly https://www.amazon.com/dp/B00HFLDXQU..._r2aFDbB98E3Y0
By chance would You know where I can find some legit motorcraft injectors? I wonder if Rock Auto sends good parts? I have never used them but my injector 7C3E-9F593-AB, 7C3Z9F593A or motorcraft CM5144 is a beast to locate.
By chance would You know where I can find some legit motorcraft injectors? I wonder if Rock Auto sends good parts? I have never used them but my injector 7C3E-9F593-AB, 7C3Z9F593A or motorcraft CM5144 is a beast to locate.
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Senior User
Joined: Oct 2018
Posts: 379
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From: Texas
Thank You Beechkid. Only place I can get a new set for decent price. Best to not be remains. Oddest thing is my old injectors have 08 on them. I think they were original with 280,000 miles 
quick question I can't seem to get my head wrapped around is what's the best solvent and method to clean the carbon off my air intake upper poly plastic manifold?
quick question I can't seem to get my head wrapped around is what's the best solvent and method to clean the carbon off my air intake upper poly plastic manifold?
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Elder User
Joined: Aug 2018
Posts: 579
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From: Riverbank, CA.
Amazon
Thank You Beechkid. Only place I can get a new set for decent price. Best to not be remains. Oddest thing is my old injectors have 08 on them. I think they were original with 280,000 miles quick question I can't seem to get my head wrapped around is what's the best solvent and method to clean the carbon off my air intake upper poly plastic manifold?
quick question I can't seem to get my head wrapped around is what's the best solvent and method to clean the carbon off my air intake upper poly plastic manifold?I also got my new intake manifold on Amazon. Same deal, genuine Motorcraft, best price shipped to my house.
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From: Southern California
The intake should be relatively clean....so any intake spray cleaner and a rag should work well for you.
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