C3 Vette Registry - The Best Resource on the Net for C3 Vettes! C3 Vette
Forums -> C3 Cooling and Heating Systems
Not Logged In! Login or Register!  Users Online: 21 / Help 
Features  Find C3 Parts on ebay in only 2 or 3 clicks!  | Add YOUR C3 to the Registry

Supporting Vendors
Mid America Motorworks
Bair's Corvettes
VetteBookStore.com
Volunteer Vette Products
CorvetteClothing.com

C3 of the Month
None Current
Enter Yours Today!
Online C3 Show
13
C3s are Registered

Vanity Plates
80SHARK
Okie Dude
Featured Links

Buy Now
Chevrolet Corvette Restoration Guide
Chevrolet Corvette Restoration Guide


Corvette from the Inside
Corvette from the Inside


GM Corvette 1963-82 (Chilton's Total Car Care Repair Manuals) (Paperback)
GM Corvette 1963-82 (Chilton's Total Car Care Repair Manuals) (Paperback)


Corvette Magazine - $19.99 for 8 issues
Corvette Magazine
Only $19.99 for 8 issues



| Hide Signatures and Profile Pics

 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
7/16/18 5:24pm - Original Message: 'A/C cycling time'
Drose Lifetime Member
Lifetime Member
- Send Private Message


Solon, OH - USA

Vette(s):
1981

Joined: 10/14/2015
Posts: 19
Having a problem with my A/C.
It blows cold air but the on and off compressor cycle time is like 10 seconds. What is a normal on off cycle time for the A/C on a 81 vette.  Outside temp for the day is 85 degrees.  The mechanic says the gauges are reading properly.  I figure I am in the process of crashing a compressor.  The system has been updated to use 134A.  Any help appreciated!!
Thanks, Dan


____________________________________
 Reply Reply  Quote Reply w/Quote
 
Support C3VR!
Suport our advertisers
7/16/18 5:52pm - Reply: 'Re: A/C cycling time'
73shark
Standard Member
- Send Private Message


Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 498
Does the '81 have a temperature setting capability like most vehicles today do? If not, I'm not sure why it would be cycling unless there's something wrong with the pressure settings but you said those checked okay. As you're probably aware the C3 Corvette A/C system was marginal at best with R12 refrigerant. Unless the conversion process changed out the evaporator and condenser, then the efficiency would be even less. That's because R134a is a less efficient refrigerant and has to have a larger condenser and also uses a different oil. Hopefully they removed the old oil from your R12 system and added the new oil.

|UPDATED|7/16/2018 3:52:53 PM (AZT)|/UPDATED|


____________________________________

1973 L-82 4 spd

 Reply Reply  Quote Reply w/Quote
7/16/18 6:55pm - Reply: 'Re: A/C cycling time'
manchestershark Lifetime Member
Lifetime Member
- Send Private Message


Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1965
I have a 72' that has been converted to 134. when pressure is up to requirement, it will cycle till it needs to work to cool the system. Mine blows about 48-50 at the duct on the dash. Best it's gonna get. As was said in previous reply, the system is antiquated and system cannot handle a COLD return. From 91 degrees outside and car in the sun, it took me about 12 miles at 45 MPH to get comfortable. Start your cooling process before it gets real hot, and it will be sufficient to be better than external heat. YES,I know, when you start from a hot car to begin the trip, it's going to take some time to bring the temp down.

____________________________________

Click on image for full view
 Reply Reply  Quote Reply w/Quote
 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
 Forums -> C3 Cooling and Heating Systems
(Moderator: Adam Wartell, Norsky, Adams' Apple)
 

 
Official C3 Vette Registry Community:
Home | Forums | Email | Who's Online | Clubs | Events | Member Stats

Other Official C3 Vette Registry Areas:
Members | Research | Shop | My Account | About C3VR
 

Corvette is a registered trademark of the General Motors Corporation(GM) & Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise noted) and does not claim or imply that Chevrolet or GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated with, sponsored or supported by GM.  Copyright/trademark/sales mark infringements are not intended, or implied and are in fact used to support GM, Chevrolet and Corvette

Official C3 Vette Registry content is Copyright 2001-2018, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS

Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 30