91 Roadmaster AC problem - Page 2 - 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 08-06-2016, 09:43 PM   #11
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Feb 2015
Posts: 102
Thanked 12 Times in 10 Posts
TheReaper! will become famous soon enough
Default

Correction to the above , I have NOT tried rolling the window down with the AC on again . TheReaper!
TheReaper! is offline   Reply With Quote
Old 08-07-2016, 01:51 PM   #12
Senior Member

Certified GM nut
 
Tech II's Avatar
 
Join Date: Feb 2014
Location: Worcester, Ma.
Posts: 2,044
Thanked 750 Times in 585 Posts
Tech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond repute
Default

Did we ever establish if this is R12 or R134a?

I have heard some stories, but,

Quote:
According to the shop ití* at now , they had it over filled and the inlet and outlet was some how epoxied closed .
And it is still doing the same thing......my guess is a pressure cycling valve that is not cycling all the time....
Tech II is offline   Reply With Quote
Old 08-07-2016, 02:28 PM   #13
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Feb 2015
Posts: 102
Thanked 12 Times in 10 Posts
TheReaper! will become famous soon enough
Default

It'* R134a , it was done by the previous owner but it wasn't tagged for some reason ?

TheReaper!


Quote:
Originally Posted by Tech II View Post
Did we ever establish if this is R12 or R134a?

I have heard some stories, but,



And it is still doing the same thing......my guess is a pressure cycling valve that is not cycling all the time....
TheReaper! is offline   Reply With Quote
Old 08-08-2016, 09:53 AM   #14
Senior Member

Certified GM nut
 
Tech II's Avatar
 
Join Date: Feb 2014
Location: Worcester, Ma.
Posts: 2,044
Thanked 750 Times in 585 Posts
Tech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond repute
Default

I meant pressure cycling switch on the accumulator, not pressure cycling valve...
Tech II is offline   Reply With Quote
Old 08-08-2016, 05:36 PM   #15
Member
Posts like a V-Tak
 
Join Date: Dec 2015
Posts: 40
Thanks: 0
Thanked 12 Times in 11 Posts
grandpabuick will become famous soon enough
Default

R134 and R12 use operate at different pressure. Your refrigerant might be low, R134 should be filled at 80 percent in R12 system. My 1989 was retro fitted with R134 and the I had to turn the screw in the pressure switch 1/4 turn cc to keep the compressor from cycling too early.
grandpabuick is offline   Reply With Quote
Old 02-24-2017, 07:37 PM   #16
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Feb 2015
Posts: 102
Thanked 12 Times in 10 Posts
TheReaper! will become famous soon enough
Default

Another update .

Like I've said previously , on auto the AC runs all the time summer or winter , but the AC shuts off on ECON . If the window is down the AC freezes up summer or winter when set to auto . Recently I found a used reasonably priced controller on eBay for $35.00 , I installed it myself but it operated the same as the original . Not a big deal $35.00 and a couple of hours work , at least I know now that'* not the problem . In the winter I unhook the wiring to the AC under the hood because if I forget to turn the ECON button on the AC goes on . It'* not the end of the world but I would love to figure this out .

Any more ideas ? TheReaper!
TheReaper! is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
'94 roadmaster total loss but clean title Gallydif Buick 10 06-20-2014 09:57 PM
Roadmaster cluster roboticjunky Buick 1 12-29-2010 07:38 PM
Roadmaster pokey Your Other Rides: Pics & Videos 7 01-23-2009 04:30 PM
roadmaster 95 help gonzo4191 Your Other Rides: Pics & Videos 0 04-14-2008 06:52 PM
1995 Roadmaster LT1 issue karfreek Lounge 0 10-30-2004 08:53 PM


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 01:26 PM.