rear end noise and air conditioning

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rear end noise and air conditioning

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Corvette >> Corvette Models >> Corvette C3 Forum >> rear end noise and air conditioning

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rear end noise and air conditioning - 9/28/2008 4:48:29 AM

Monica

Posts: 3
Joined: 9/28/2008
Status: offline

Thanks to anyone that can help. A brand new restoration and I cannot figure out this problem.
This car has new trailing arms new inner and outer bearings, new rear spindles, the rear end has been gone through and new bearings and seals installed. Without question I had an alignment done. I have checked the half shafts to insure they aren''t bent. New u joints.
I have checked the rotors to insure they are true.
The problem is that after the car is warmed up, when you stop and let off the brake just enough to let the car barely move and the the front wheels turned either left or right (more prominent when turning right) you can feel and hear a chatter in the rear wheels. I thought at first the problem was no posi lube in the rear end. I know that that is not the problem . I made sure it got after I had the pig gone thru. Does anyone have any ideas?

The second problem i''m struggling with is the air conditioning. The compressor doesn''t work thru the dash selector. I by passed the dash control by putting 12v and ground right to the compressor and it works.
Thanks again to anyone that has an idea.

Post #: 1

RE: rear end noise and air conditioning - 9/28/2008 7:42:00 AM

Texas Jim

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Joined: 12/15/2005
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Could the chatter in the rear be the "posi clutches?" They''ll make a chatter when they''re starting to go.

(in reply to Monica)

Post #: 2

RE: rear end noise and air conditioning - 9/28/2008 6:13:32 PM

73shark

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Welcome to the Corvette Forum.

I agree w/ Texas Jim. If it only happens when turning, it almost has to be in the rearend. Since you said you put in the posi lube (GM''s version, I hope), I would suggest you go to a parking lot and do a series of figure 8 turns to try to work the lube into the clutch pack.

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RE: rear end noise and air conditioning - 9/28/2008 8:27:34 PM

blueshark

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Joined: 7/20/2006
From: Dickson, TN.
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Could the rear end noise be the bearings? since it happens with side pressure in turns....

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RE: rear end noise and air conditioning - 9/28/2008 8:31:50 PM

Texas Jim

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Joined: 12/15/2005
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quote:

ORIGINAL: blueshark

Could the rear end noise be the bearings? since it happens with side pressure in turns....

By the time you get a "chatter" from a bearing while turning, it would be making BIG noise on the highway before that-something you''d stop and check out.

(in reply to blueshark)

Post #: 5

RE: rear end noise and air conditioning - 9/28/2008 9:14:16 PM

DeeVeeEight

Posts: 517
Joined: 10/24/2007
From: South Jersey
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quote:

ORIGINAL: 73shark

Welcome to the Corvette Forum.

I agree w/ Texas Jim. If it only happens when turning, it almost has to be in the rearend. Since you said you put in the posi lube (GM''''s version, I hope), I would suggest you go to a parking lot and do a series of figure 8 turns to try to work the lube into the clutch pack.

I had this same problem when my rear end was rebuilt -
A - I agree - try the figure 8''s - to try and work the fluid into the new clutches - try the fig. 8''s in reverse too - just be careful!
B - If the chatter persists - add another bottle of the GM additive and try the Fig. 8''s again - the chatter will go away after awhile.

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RE: rear end noise and air conditioning - 9/28/2008 9:18:15 PM

DeeVeeEight

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Joined: 10/24/2007
From: South Jersey
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As far as the AC goes - the head unit in the center console may be at fault. Check fuses at the fuse panel then take a peek at the head unit. You may also want to check the wiring under the hood that goes to the compressor. After this many years there is no telling who or what may have happened to it.

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If you don't ask, you get the same answer as no.

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RE: rear end noise and air conditioning - 9/29/2008 3:53:59 AM

Texas Jim

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Joined: 12/15/2005
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DeeVee, Does the additive need to actually soak into the clutches-like after a differential rebuild? And are you saying that w/ a differential that''s been run for years, the clutches could go dry (as far as not having the correct/not enough additive) and cause that chatter?
*****After writing here, I went back as I questioned the specifics of my answer(s) due to your answer. Like a "skimming" idiot, I never read that the rear had JUST been gone through, and assumed it had miles on it. Now my question is this: DeeVee, Have you ever seen it recommended that one should coat or soak the clutch pack in the additive prior to installation?
Haven''t skimmed an article that terribly in quite awhile. Sorry f/ wasting everyone''s time.

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Post #: 8

RE: rear end noise and air conditioning - 9/29/2008 6:27:55 PM

78buckshot

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From: Michigan
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Hi Monica and welcome to the site. When I first read your post I thought about brake groan right away, thats when the car is just barely moving with the brake applied, like when your creeping up in line waiting for a traffic light to change. Then I thought about my ''78 and the creaking and popping from the rear that I thought for sure had to be the posi clutches-nope!, the parking brakes were falling apart. Anyway, before you condemn the differential, make sure it''s not the brakes. Good luck.

(in reply to Monica)

Post #: 9

RE: rear end noise and air conditioning - 9/29/2008 9:55:54 PM

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Joined: 8/7/2006
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Hi 78buckshot, good call! Hope for Monica''s sake it''s just the parking brake. Hard enough to get in there but sure less work than pulling the rear. PG.

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Post #: 10