AC Pressures? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Buick When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 06-06-2006, 02:19 PM   #1
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Apr 2005
Posts: 243
Thanks: 0
Thanked 3 Times in 3 Posts
dandyd is on a distinguished road
Default AC Pressures?

'93 Park Avenue. A/C not cooling properly. Checked the pressues and the low side reading was 22-25 psi. while the high side was running between 200-210. It appears the high side is too high and the low side is too low. Thus, giving me a blockage at the orifice tube? Correct?

Thanks
dandyd is offline   Reply With Quote
Old 06-06-2006, 02:31 PM   #2
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Tough one.. I'm going for back up...cover me.
BillBoost37 is offline   Reply With Quote
Old 06-06-2006, 02:57 PM   #3
Senior Member
True Car Nut
 
Join Date: Oct 2005
Location: Central Florida
Posts: 7,030
Thanks: 0
Thanked 0 Times in 0 Posts
lash is on a distinguished road
Default

That sounds to be about right, but I have a question. Has the system ever been compromised? Like a new compressor or other parts? That is the most common way for an orifice tube to become blocked.

There are rare occasions were there is some manufacturing material that comes loose and causes blockage of the filter there, but usually that reason shows itself before this many years have gone by.
lash is offline   Reply With Quote
Old 06-06-2006, 06:26 PM   #4
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Apr 2005
Posts: 243
Thanks: 0
Thanked 3 Times in 3 Posts
dandyd is on a distinguished road
Default

Not that I know of. The Large low pressure line does not get cold, BUT the smaller low pressure line going into the evaporator does sweat and get nicely cold. The small high pressure line gets hot as it should. Looks like a blockage, but I don't want to open the system if not necessary because that'* a whole lot more work.
dandyd is offline   Reply With Quote
Old 06-06-2006, 07:09 PM   #5
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

There is a particulate trap in the lower of the two lines that enter the radiator core. Clogged?
J Wikoff is offline   Reply With Quote
Old 06-08-2006, 10:00 AM   #6
Senior Member
Posts like a Northstar
 
Join Date: Sep 2005
Location: Dayton, OH
Posts: 600
Thanks: 0
Thanked 0 Times in 0 Posts
imidazol is on a distinguished road
Default Re: AC Pressures?

Quote:
Originally Posted by dandyd
'93 Park Avenue. A/C not cooling properly. Checked the pressues and the low side reading was 22-25 psi. while the high side was running between 200-210. It appears the high side is too high and the low side is too low. Thus, giving me a blockage at the orifice tube? Correct?

Thanks
Is the evaporator core clean? Does anyone else remember the method for checking to see if it'* blocking air flow affecting cooling.
imidazol is offline   Reply With Quote
Old 06-08-2006, 11:33 AM   #7
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Apr 2005
Posts: 243
Thanks: 0
Thanked 3 Times in 3 Posts
dandyd is on a distinguished road
Default

Just by blowing compresser air thru it? Is there any other way? It does seem that the driver'* side air is colder than the passenger air. This is one of those dual type units.
dandyd is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
AC pressures and orifice tube Floordry 2000-2005 1 06-14-2009 09:36 PM
anyone with a 96 FSM, a/c line pressures? NERV 1992-1999 7 07-06-2006 09:12 AM


Thread Tools Search this Thread
Search this Thread:

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



All times are GMT -4. The time now is 03:04 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.