A/c problem
Thread Starter
Heel & Toe
Joined: Nov 2012
Posts: 23
Likes: 0
A/c problem
Converting from r12 r134a. Low side pressure good. High side pressure very high. Not getting any cooling. Replaced the expansion tube (orfice). Still have same problem. Pulled vacuum and held very good. Any suggestions welcomed. This is on an 87 vette.
Team Owner
Joined: Dec 2012
Posts: 30,427
Likes: 1,609
From: Outside the Quick Stop N.J.
It sounds like there is some kind of restriction in the system somewhere then. You will have to evacuate the entire charge and check piece by peice. I would use nitrogen to "blow out" each part of the system to clear the blockage.
Thread Starter
Heel & Toe
Joined: Nov 2012
Posts: 23
Likes: 0
OK. Will do and lit you know the results. Thanks
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Thread Starter
Heel & Toe
Joined: Nov 2012
Posts: 23
Likes: 0
Melting Slicks
Joined: Aug 2008
Posts: 2,082
Likes: 50
From: Palmdale CA
There are many Variables that effect High/Low system pressure, such as Ambient temperature, Humidity, Engine RPM, Electric Fans.. etc etc.
On an 80° day I would expect to see around 30psi on the low side ( this by the way equates to Evaporator temperature) I'm guessing your Condenser is not efficient enough to Cool the Hot 134 Gas back into the proper Gas/liquid state. This could be do to air blockage at the coil, or it's just not efficient enough for R134..
Check out this web site..
http://www.autoacforum.com/messagevi...&threadid=7927
Thread Starter
Heel & Toe
Joined: Nov 2012
Posts: 23
Likes: 0
What do you mean by this?
There are many Variables that effect High/Low system pressure, such as Ambient temperature, Humidity, Engine RPM, Electric Fans.. etc etc.
On an 80° day I would expect to see around 30psi on the low side ( this by the way equates to Evaporator temperature) I'm guessing your Condenser is not efficient enough to Cool the Hot 134 Gas back into the proper Gas/liquid state. This could be do to air blockage at the coil, or it's just not efficient enough for R134..
Check out this web site..
http://www.autoacforum.com/messagevi...&threadid=7927
There are many Variables that effect High/Low system pressure, such as Ambient temperature, Humidity, Engine RPM, Electric Fans.. etc etc.
On an 80° day I would expect to see around 30psi on the low side ( this by the way equates to Evaporator temperature) I'm guessing your Condenser is not efficient enough to Cool the Hot 134 Gas back into the proper Gas/liquid state. This could be do to air blockage at the coil, or it's just not efficient enough for R134..
Check out this web site..
http://www.autoacforum.com/messagevi...&threadid=7927