ac noise
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New User
Joined: Jul 2000
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ac noise
i have a 77 f100 302 auto with factory air. it seems that when im running the ac a roaring like noise comes from the compresser, the ac clutch or the belts. this noise sort of resonates through the whole truck when i accelerate. it only does it like at a certain rpm. and doesnt do it at all when the ac is off. does anyone know how to stop this noise and is it normal. the ac is otherwise working properly.
Elder User
Joined: Mar 2001
Posts: 898
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From: SF Bay area
ac noise
Sounds to me like you just diagnosed you own problem down to the A/C comperssor. This is a job best left to the pros. They have all necessary equipment to do the job. my 2 cents worth
Wayne
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Wayne
http://home.pacbell.net/whomrig
Lead Driver
Joined: Nov 2000
Posts: 6,637
Likes: 349
From: Albuquerque
ac noise
If you have a thermostatic fan clutch it could be making the noise. They tighten up as the air temp rises (heat from the condensor).
1977 Ford F-100
400m/c6
280,000 miles
Stock on the outside
modified/rebuilt everything
1977 Ford F-100
400m/c6
280,000 miles
Stock on the outside
modified/rebuilt everything
New User
Joined: Feb 2001
Posts: 10
Likes: 0
ac noise
My 79 F-100's ac compressor does the same thing. Mine sounds like an internal bearing gone bad. It still pumps nice cold air (for now at least), so I left it alone. If you have an Auto Zone near you, they offer the clutch by itself for about $60 or with a rebuilt compressor for about $150. I figure when mine goes that's where I'll go for another one. Around here (SE KS) that's a way cheaper route than having the old one worked on.
Joe
Joe
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Joined: Oct 2000
Posts: 219
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From: Richmond USA
ac noise
A/C, A/C, did he say A/C in his 77'?.
I want working A/C.
Let's trade for the summer, I'll give it back, honest.
Dre'
1978 F-150, 460ci(750cfm,Edelbrock Performer,Dynomax Ceramic Coated headers,etc.)Auto-C6,3:70.1 - 9" Posi.
I want working A/C.
Let's trade for the summer, I'll give it back, honest.
Dre'
1978 F-150, 460ci(750cfm,Edelbrock Performer,Dynomax Ceramic Coated headers,etc.)Auto-C6,3:70.1 - 9" Posi.
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New User
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ac noise
yeah i got the truck from my wife's grandfather. he bought it new in 77 i still have the window sticker and other paperwork. he tells me that the ac has never been touched. i had to add freon last summer and it is still cold as ice even here in louisiana. its been through 1 engine and 2 transmissions but the ac is still working.
Senior User
Joined: Apr 2000
Posts: 170
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ac noise
You got an a/c belt vibrating. At least that's what's wrong with mine. Have someone rev it up while you're watching the a/c belt under the hood. When you hit that special rpm, it roars through the whole truck. I've been fighting it for three years, now, and still am making fine adjustments to alighment of the compressor pulley with idler and crank.
If this is your problem, you may want to consider carrying an extra thermostat housing, bolts for it and a bucket of water around with you. I've had this a/c vibration break the 5" bolts that go thru the a/c mounting bracket and thermo housing three times. Needless to say, the engine gets rea hot real quick when all the water gets pumped out.
Dan Blackwell
If this is your problem, you may want to consider carrying an extra thermostat housing, bolts for it and a bucket of water around with you. I've had this a/c vibration break the 5" bolts that go thru the a/c mounting bracket and thermo housing three times. Needless to say, the engine gets rea hot real quick when all the water gets pumped out.
Dan Blackwell
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From: Southern MD
ac noise
Did you put any oil in the compressor when you added freon?
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94 E-150 High Top Conversion Van 4.9/C-6
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Brett Foote
Lead Driver
Joined: Nov 2000
Posts: 6,637
Likes: 349
From: Albuquerque
ac noise
On those old York and Tecumseh compressors the belts needs to be tighter than "#####'s hat band" or you will get vibration.
1977 Ford F-100
400m/c6/4:11/Gear Vender O.D.
Crane hydralic roller, forged, ported polished,Deamon,Edlebrock, yada, yada, yada
280,000 miles
Stock on the outside
modified/rebuilt everything
1977 Ford F-100
400m/c6/4:11/Gear Vender O.D.
Crane hydralic roller, forged, ported polished,Deamon,Edlebrock, yada, yada, yada
280,000 miles
Stock on the outside
modified/rebuilt everything
Thread Starter
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New User
Joined: Jul 2000
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ac noise
ok i i fixed it. i replaced the belt with a new one that is one inch shorter. i figured the shorter the belt the less belt that can vibrate. thanks to all that responded and i hope that this helps someone out there with the same problem.
