Will A/C compressor clutch engage if freon is low? - CorvetteForum - Chevrolet Corvette Forum Discussion

Go Back   >
Log In 
Register FAQ Search Today's Posts Mark Forums Read Vendor Directory

C5 Tech
Corvette Tech/Performance: LS1 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace Sponsored by
Dart Machinery

Will A/C compressor clutch engage if freon is low?

Reply
 
 
 
Thread Tools Search this Thread
Old 03-23-2012, 10:43 PM   #1
TorchRedRocket
CF Senior Member
Thread Starter
 
TorchRedRocket's Avatar
 
Member Since: May 2010
Location: Winfield IN
Posts: 4,290
Thanks: 0
Thanked 1 Time in 1 Post
Default Will A/C compressor clutch engage if freon is low?

Just recently I have noticed that my air conditioning is not working. When I try to turn it on, the orange a/c light turns on for 2-3 seconds, and then quickly goes out. If I have someone press it while I am looking under the hood, the a/c compressor clutch is not engaging. To my knowledge, my a/c system has never been recharged (2001 with 76k miles), so I think it is just my freon being low or empty. I have no diagnostic codes either.

Am I correct in assuming that the clutch won't engage if the freon is below a certain level? Or do I have an issue with the clutch?
TorchRedRocket is offline   Reply With Quote
Old 03-23-2012, 11:24 PM   #2
MotoMike02
CF Senior Member
 
Member Since: Feb 2012
Location: Las Vegas Nevada
Posts: 137
Thanks: 0
Thanked 0 Times in 0 Posts
Default

The system has a low pressure switch so if your low it won't allow the clutch to engage to protect the system
MotoMike02 is offline   Reply With Quote
Old 03-23-2012, 11:41 PM   #3
Lothar34
CF Senior Member
 
Lothar34's Avatar
 
Member Since: May 2010
Location: Pearland, TX
Posts: 1,423
Thanks: 0
Thanked 0 Times in 0 Posts
Default

It won't engage if the pressure is low, but I thought that the a/c light would blink before going off. That is what mine did.
Lothar34 is offline   Reply With Quote
Old 05-21-2012, 12:30 PM   #4
mickey_7106
CF Senior Member
 
mickey_7106's Avatar
 
Member Since: Dec 2006
Location: East Oakland CA
Posts: 2,353
Thanks: 0
Thanked 0 Times in 0 Posts
Default

How can I make it engage so that I can recharge the system and check where my leak is?
mickey_7106 is offline   Reply With Quote
Old 05-21-2012, 12:54 PM   #5
dougbfresh
CF Senior Member
 
Member Since: Nov 2005
Posts: 6,993
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Jumper the switch.
dougbfresh is offline   Reply With Quote
Old 05-21-2012, 01:01 PM   #6
absolutscharf
CF Senior Member
 
absolutscharf's Avatar
 
Member Since: May 2009
Location: Waltham MA
Posts: 118
Thanks: 0
Thanked 3 Times in 3 Posts
Default

Quote:
Originally Posted by mickey_7106 View Post
How can I make it engage so that I can recharge the system and check where my leak is?
Put enough refrigerant in for the clutch to engage, and you can take it from there.
absolutscharf is offline   Reply With Quote
Old 05-21-2012, 01:06 PM   #7
TorchRedRocket
CF Senior Member
Thread Starter
 
TorchRedRocket's Avatar
 
Member Since: May 2010
Location: Winfield IN
Posts: 4,290
Thanks: 0
Thanked 1 Time in 1 Post
Default

UPDATE: Turns out my freon was completely EMPTY. Apparently there is a small leak somewhere in the system that they weren't able to detect, so we'll see how long this charge lasts.
TorchRedRocket is offline   Reply With Quote
Old 05-21-2012, 02:24 PM   #8
mickey_7106
CF Senior Member
 
mickey_7106's Avatar
 
Member Since: Dec 2006
Location: East Oakland CA
Posts: 2,353
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by dougbfresh View Post
Jumper the switch.
thanks. any idea how?
Quote:
Originally Posted by absolutscharf View Post
Put enough refrigerant in for the clutch to engage, and you can take it from there.
it wont take refrigerant unless the clutch engages
mickey_7106 is offline   Reply With Quote
Old 05-21-2012, 02:25 PM   #9
mickey_7106
CF Senior Member
 
mickey_7106's Avatar
 
Member Since: Dec 2006
Location: East Oakland CA
Posts: 2,353
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by TorchRedRocket View Post
UPDATE: Turns out my freon was completely EMPTY. Apparently there is a small leak somewhere in the system that they weren't able to detect, so we'll see how long this charge lasts.
did you take it to a shop or are you doing your own work?
mickey_7106 is offline   Reply With Quote
Old 05-21-2012, 02:34 PM   #10
Bill Curlee
Tech Contributor
Support Corvetteforum!
CI 6,7,8,9,11 Vet
St. Jude Donor '08
 
Bill Curlee's Avatar
 
Member Since: Jun 2001
Location: Gales Ferry CT
Posts: 27,993
Thanked 458 Times in 385 Posts
Default

It will take the GAS (can right side up, placed in a pale of hot water) and once it has enough system pressure to trip the low pressure cut out, the clutch will cycle on and off until there enough pressure to prevent the low pressure (suction side) from going low.

If the system was zero pressure, you should have had it vacuumed out to remove non condensables and moisture. In reality, you should change the orfice restrictor,and the receiver dryer, vacuum it out and then fill per the service manual procedure....

To properly charge the system you will need the procedure and chart in the service manual. Too much pressure is just as bad as no pressure.

Bill
Bill Curlee is offline   Reply With Quote
Old 05-21-2012, 03:10 PM   #11
dougbfresh
CF Senior Member
 
Member Since: Nov 2005
Posts: 6,993
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by mickey_7106 View Post
thanks. any idea how?


it wont take refrigerant unless the clutch engages
Have not had to do it in a long while, but you pull the connector to the pressure switch and use a paper clip.
dougbfresh is offline   Reply With Quote
Old 05-21-2012, 03:29 PM   #12
Bill Curlee
Tech Contributor
Support Corvetteforum!
CI 6,7,8,9,11 Vet
St. Jude Donor '08
 
Bill Curlee's Avatar
 
Member Since: Jun 2001
Location: Gales Ferry CT
Posts: 27,993
Thanked 458 Times in 385 Posts
Default

LOL

Its NOT as easy as it sounds cause the pressure sensor is NOT a common open closed SWITCH like days of old!!!.

Its a pressure transducer and here it is::::



If you do it WRONG,, you will need more than R-134!!

Just add gas until the pressure is high enough to run the compressor to check system pressures. Hey,, if you have a TECH2,, you can command the compressor to run!

You can however,, go to the relay and jumper it there and command the clutch to engege!

BC

Last edited by Bill Curlee; 05-21-2012 at 03:32 PM.
Bill Curlee is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • Will A/C compressor clutch engage if freon is low?
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    A/C Compressor news2me C3 Tech/Performance 14 06-08-2016 01:40 PM
    AC Compressor Won't Engage C4ProjectCar C4 Tech/Performance 38 09-14-2014 02:12 AM
    A/C Clutch Squeaking when first engaged Deepa C4 Tech/Performance 7 07-02-2014 01:57 PM
    a/c compressor clutch donaldbly C3 Tech/Performance 2 06-24-2014 10:31 AM
    What kind of Freon can I use pcolt94 C4 Tech/Performance 18 05-12-2012 11:56 PM


    Tags
    ac, air, c5, clutch, compressor, conditioner, corvette, engage, engaged, engaging, freon, low, recharge, turn, work

    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump


    All times are GMT -4. The time now is 02:35 AM.