Need Help with my AC
Thread Starter
Intermediate
Joined: May 2008
Posts: 37
Likes: 0
From: New Jersey
Need Help with my AC
I have a 1987 with the electronic/digital climate control. The defrost and heat seem to work ok, but the AC is not working. When I take it to max cool (60 degrees) the AC compressor never kicks on.
I have one of those AC charging set ups you get at the auto parts store. It is reading 45 which according to the gage is good.
Not sure where to go from here. This is my first Vette and I am just learning. Thank you in advance for any help.
I have one of those AC charging set ups you get at the auto parts store. It is reading 45 which according to the gage is good.
Not sure where to go from here. This is my first Vette and I am just learning. Thank you in advance for any help.
Safety Car
Joined: Jul 2004
Posts: 3,845
Likes: 30
I have a 1987 with the electronic/digital climate control. The defrost and heat seem to work ok, but the AC is not working. When I take it to max cool (60 degrees) the AC compressor never kicks on.
I have one of those AC charging set ups you get at the auto parts store. It is reading 45 which according to the gage is good.
Not sure where to go from here. This is my first Vette and I am just learning. Thank you in advance for any help.
I have one of those AC charging set ups you get at the auto parts store. It is reading 45 which according to the gage is good.
Not sure where to go from here. This is my first Vette and I am just learning. Thank you in advance for any help.
...remove that plug and short the PLUG/CONNECTOR with a paperclip with the ignition on and the ac on high.....if the ac clutch at the front of the compressor come on (pulls in) then, you know that the clutch on the ac compressor is good and that you are probably low on refrigerant which means you'll have to charge up the system....
Intermediate
Joined: Sep 2006
Posts: 29
Likes: 0
From: edison nj
ac
i was told that if low ac the ecm will not let ac clutch kick on take your pos wire off battery than put back on you should hear your ac clutch kick on .if your ac gas low clutch will stop working till she is filled up with the right amount of charge .
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 42
From: Baltimore, MD USA
The Heater/AC Control Head monitors the High Pressure Cut Out switch and the Pressure Cycling switch. Both switches must be closed.
You can unplug the electrical connector at each switch and use an ohm meter and measure across the switch. Should measure zero ohms.
For the Pressure cycling switch to close requires at least 47 psi of pressure in the system. If both switches are closed and AC is requested the Heater/AC control head will signal the Blower Control Module to engage the compressor clutch.
The Blower Control Module provides the ground path for the AC Clutch coil. The clutch coil pulls in the clutch plate and engages the compressor.
A signal is also sent to the ECM to increase engine rpm to compensate for the extra load placed by the compressor.
Last edited by Hooked on Vettes; Jun 13, 2008 at 01:07 AM.
Team Owner
Joined: Jan 2003
Posts: 20,322
Likes: 249
From: Summerland B.C. Canada
Thread Starter
Intermediate
Joined: May 2008
Posts: 37
Likes: 0
From: New Jersey
......you could have a low refrigerant charge and thusly, a sensor is NOT letting you turn on the compressor, saving the system...there is a large "connector" that is located in/on one of the large aluminum a/c lines that is located near the firewall-heaterbox area....
...remove that plug and short the PLUG/CONNECTOR with a paperclip with the ignition on and the ac on high.....if the ac clutch at the front of the compressor come on (pulls in) then, you know that the clutch on the ac compressor is good and that you are probably low on refrigerant which means you'll have to charge up the system....
...remove that plug and short the PLUG/CONNECTOR with a paperclip with the ignition on and the ac on high.....if the ac clutch at the front of the compressor come on (pulls in) then, you know that the clutch on the ac compressor is good and that you are probably low on refrigerant which means you'll have to charge up the system....
Safety Car
Joined: Jul 2004
Posts: 3,845
Likes: 30
I did what you said above and the AC compressor kicked on. So thats good news. I put some refrigerant in it and then the compressor was kicking on and off by itself. I watched the gage on my servicing hose and it would kick on at 45 or so and kick back off at about 20 and kept cycling on and off. I guess I need more refirgerant. The car was converted to R134 about 4 years ago according to the sticker. Do I need to add oil also?
Last edited by Da Mail Man; Jun 15, 2008 at 02:49 PM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
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
Thread Starter
Intermediate
Joined: May 2008
Posts: 37
Likes: 0
From: New Jersey
I just put another can of refrigerant in it. It also had 3 ounces of oil in it. The AC is blowing cold now. We will see how long it lasts. The AC did not work when I bought the car so chances are it does have a leak somewhere. But for now, its cold.
Thanks to all who supplied me with information and diagrams, again I do appreciate it.
