Need A/C help
Thread Starter
Melting Slicks
Joined: Jul 2006
Posts: 2,151
Likes: 0
From: Strongsville Ohio
Need A/C help
Posted this before with no luck, but no its getting hott outside and want to fix this issue.
1994 6sp. The compressor with no kick on, jumpered the low pressure switch and nothing happend. AC button in car is not flashing.
What is my next step?
1994 6sp. The compressor with no kick on, jumpered the low pressure switch and nothing happend. AC button in car is not flashing.
What is my next step?
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
I know you posted this before so I am going to assume the low pressure cycling switch is good.
Measure the voltage on the dark blue wire to the low pressure switch with the A/C selected and measure the DC voltage. Do not disconnect anything, just measure the voltage, ground the black lead to the engine. Should be between 6.0 -7.0 volts.
Measure the voltage on the dark blue wire to the low pressure switch with the A/C selected and measure the DC voltage. Do not disconnect anything, just measure the voltage, ground the black lead to the engine. Should be between 6.0 -7.0 volts.
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
If you made the measurement correctly, then you are not getting the 6 volt signal from the programmer to tell the PCM to pull in the clutch. The control head tells the programmer to turn on the compressor. So aside from bad connections, it could be the control head or programmer.
I assume all fuses are good.
I have to ask if ALL the vents are working properly as well as all 10 steps of the blower motor.
Do you have any codes or flashing LEDs on the control head.
I understood your post except for this last part. "but strait .0 in regular batt voltage" What does this mean.
Aside from replacing either box, I might take a shot at cleaning the pin contacts in the control head between the 2 boards. It's a long shot but if you run out of ideas, it might worth trying.
There are some other troubleshooting steps but you need a Tech 1.
I assume all fuses are good.
I have to ask if ALL the vents are working properly as well as all 10 steps of the blower motor.
Do you have any codes or flashing LEDs on the control head.
I understood your post except for this last part. "but strait .0 in regular batt voltage" What does this mean.
Aside from replacing either box, I might take a shot at cleaning the pin contacts in the control head between the 2 boards. It's a long shot but if you run out of ideas, it might worth trying.
There are some other troubleshooting steps but you need a Tech 1.
Thread Starter
Melting Slicks
Joined: Jul 2006
Posts: 2,151
Likes: 0
From: Strongsville Ohio
You asked me to check voltage of the dark blue wire then check it again in DV voltage. I was saying I had .0 in regular voltage and .02 in DC voltage. I am not a pro in the voltage meter.
I have no blinking lights and no check engine codes. I dont know where the programming board is to clean the contacts?
If I have no voltage at the switch, where would be the next place backwards to check?
I have no blinking lights and no check engine codes. I dont know where the programming board is to clean the contacts?
If I have no voltage at the switch, where would be the next place backwards to check?
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
Last time you posted in October (post 35), I had you measure that same point on the blue wire. You measured 5.5 volts DC. A bit lower than 6 volts but the signal voltage was still there. This time you measured 0 volts. That would change my whole line of thinking and direction.
I'm not really sure where to send you at this time because I'm not sure what I should be chasing. I'm not sure you made contact this time.
I'm not really sure where to send you at this time because I'm not sure what I should be chasing. I'm not sure you made contact this time.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski