The green light for my AC button quit working. It's not lighting up, but fuse #13 is not blown. I was wondering if the AC relay is bad, because I have to jump power to the relay. When the green light was working the AC compressor never kicks on until you jump power to the AC relay.

I also tried getting my AC compressor going (R-12 compressor), and I retrofitted the system, when I added the refrigerant(R134), I found out that the clutch was bad on the AC.

I ordered a used AC compressor, but the compressor oil will be drained out of it, so that it can be shipped.

I was wonder what kind of oil should I add to the compressor? Ester oil or PAG 46 oil. I assume I need to add 4oz of oil, 2oz for the High side and 2oz for the low side?

 

Most re-man compressors come with oil in them already with sealing plastic caps to keep it in, or they come
with instructions on which oil to use and how much to put in, including which port.

Follow the instructions with the replacement compressor.

 

So I will need PAG oil?

Also if fuse #13 is not blown, and the Green indicator light for the AC button is not working does that mean the AC Relay is blown? The Green indicator light was working but now it doesn't light up.

 

I sold my 93 and service manual so I'm going on memory, but I'm pretty sure the engine control module won't turn on that relay if you have no freon in the system. Was it the low pressure cutout switch or something like that?

Also, please evacuate the system, "pull a vacuum" before recharging. Once you add enough freon the compressor will kick on.

 

The light in the A/C button has nothing to do with the relay.

Sounds like the A/C switch or its bulb may be bad.

Does the A/C switch work to turn on the condenser fan? Has the switch ever worked to turn on the condenser fan?

Does the blower switch work to turn on the cabin blower?

 

A/C switch was working but I had to jump power to the compressor in order to add the refrigerant.

The blower switch turns the blower in the cabin. All the buttons on the AC Climate Control works except the AC button. I checked Fuse #13 that's fine, and I also checked Fuse #35 under the hood and that's fine.


I'm tried pulling the climate control out of the car but it's still not coming out. I took out all the screws and radio. Once I get that climate control out I can test that Black and Yellow wire your talking about but I'm pretty much stuck on getting the climate control out.

 

 

It hasn't worked to turn it on.

 

1) Unplug the pressure switch. It has a 2P connector with Blu/Red and Yel/Wht wires.

2) Turn the key to ON(II).

3) In the unplugged switch connector, ground the Blu/Red wire terminal to the chassis.

Did the condenser fan run? Did the compressor clutch click?

 

I grounded the blue/red wire to ground and the condenser fan doesn't kick on, nor does the compressor click.

I ran power and ground to the condenser fan and the fan works great. I ran power to the compressor (red wire) and the compressor and clutch works great.

Fuse #13 under the dash is not blown, and the condenser fan for the hood fuse is not blown.

I also swapped the 2 relays near the condenser fan and had no change.

 

Do you have a multimeter?

 

I got a few, can't live without one

 

With the key in ON(II), does the Blu/Red wire terminal in the unplugged pressure switch have battery voltage to body ground? Do both test tabs of installed 20A hood fuse 35 and 7.5A dash fuse 13 have battery voltage to body ground?

 

Pressure switch blue/red wire= 4.60volts
Pressure switch yellow wire/white wire=11.86volts

Fuse 35=12.35 for both tabs
Fuse 13=12.34 for both tabs

 

Unplugged pressure switch connector near condenser, right?

Problem - ^This voltage should be ~12V

Problem - ^This should basically have no voltage.


^All good here.



.

 

Plug the pressure switch back in and then unplug the A/C thermostat at the evaporator and repeat the voltage tests in the Blu/Red and Yel/Wht wire terminals of its connector.

 

Where is it located at? Also what color plug and wires would I be looking for?

I looked around under the dash near the evaporator.

 

When you did the voltage tests on the pressure switch connector (post #14), was the A/C button switch toggled on?

 

 

I tested it with it on and off.

With the switch off it was 4.60, with the switch on it was 4.67volts.

 

What about the Yel/Wht wire?

 

It still had the 11.89 volts, I got the thermal connector unplugged let me go test that real quick.

 

With the pressure switch plugged back in.

I tested voltage at the AC thermostat connector.

With the AC Button off

Blue/Red wire 0.00volts
Yellow/White 11.86volts

With the AC button on

Blue/Red wire 8.67
Yellow/White 11.86volts

 

If you ground the Yel/Wht wire terminal in the unplugged thermostat connector to the metal frame under the dash, does the condenser fan run and/or does the compressor clutch click when the key is turned to ON(II)?

 

It does not turn on and does not click. I only hear the relay click near the condenser fan.