Go Back   Corvette Forum > C4 Corvettes, 1984 - 1996 > C4 Tech/Performance
Sign in using an external account
Register Forgot Password?
Register Search Today's Posts Mark Forums Read FAQ Vendor Directory
Search
C4 Tech/Performance
L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Welcome to Corvetteforum.com!
Welcome to Corvetteforum.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join Corvetteforum.com today!


Corvette Store
 
 
C7 Parts & Accessories
C6 Parts & Accessories
C5 Parts & Accessories
C4 Parts & Accessories
C3 Parts & Accessories
C2 Parts & Accessories
C1 Parts & Accessories
Wheels & Tires
Sponsored Ads
 
 
Vendor Directory
  
Reply
 
 
 
 
Thread Tools Search this Thread
Old 04-25-2011, 11:26 AM   #1
corvette95
CF Senior Member
 
Member Since: Jul 1999
Location: Leeds AL
Default 89 a/c low pressure line freezing up

My low side is freezing up. I did replace compressor couple months ago. Changed orifice tube and pulled a vacuum. What causes line freezing?
corvette95 is offline   Reply With Quote
Old 04-25-2011, 12:26 PM   #2
SunCr
CF Senior Member
 
Member Since: Dec 2000
Location: San Diego, Ca
Default

Low Pressure Switch should open at 25 psi to prevent the ice (assuming it's still R12). It's either defective or needs to be adjusted. There's a screw between the terminals of the switch. Turn it clockwise to raise the cutoff threshold. To check it out, hook up your Manifold Gage set and put the a/c on Max. Pull the Blower Motor connector and the pressure should drop. Note the low side pressure when the compressor cycles off. Remove the Low Pressure harness from the switch and turn the screw a 1/2 turn and recheck. If it doesn't change anything, get a new one. Note: the new Switch may be set for R134 which is a 22.5 psi threshold. That's too low and it will have to be adjusted to 25 psi to prevent the icing.
SunCr is offline   Reply With Quote
Old 04-25-2011, 12:37 PM   #3
corvette95
CF Senior Member
 
Member Since: Jul 1999
Location: Leeds AL
Default

Its still r12. I will check the #'s and that switch and post findings! Thxs!
corvette95 is offline   Reply With Quote
Old 04-25-2011, 12:37 PM
 
Go Back   Corvette Forum > C4 Corvettes, 1984 - 1996 > C4 Tech/Performance
Reload this Page 89 a/c low pressure line freezing up
 
 
 
Reply

Tags
ac, freeze, freezes, freezing, frosting, icing, line, lines, low, mobil, orifice, preesure, pressure, side, tube


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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Is It True That If You Put Automatic Transmission Fluid In... Builderrick Off Topic 14 05-11-2014 01:01 AM
freeze plug size LT1driver C3 Tech/Performance 2 04-04-2014 11:50 PM
Freeze Plug Size mazdaverx7 C4 General Discussion 2 08-14-2013 10:54 PM
Plasma TV in garage vette1963 Off Topic 16 01-04-2008 09:41 AM
parking brake froze? Todbo C3 Tech/Performance 5 05-08-2002 07:16 PM


All times are GMT -4. The time now is 01:07 PM.


Emails & Password Backup