[MatosTaco]

I've been trying to make sense of the wiring diagram Zip posted 2 years ago. If the A/C switch lamp is lighting up the circuit's getting power, and the A/C Amplifier (the controller) should be getting power. If the A/C Amplifier is faulty that might explain everything.

Right now I have the system under vaccuum. I had the vacuum pump on it for 30 minutes and then closed the valves. The system has held at 30 inHg without change, so I am looking into electrical now. I am going to try to charge the system with the pressure switch jumped to see what happens. Where is the amplifier?

 

[Enola Gaia]

Here's an illustration of the parts from the 1995.5 FSM. The A/C Amplifier is a little gizmo mounted on the side of the cooling unit.

 

[Enola Gaia]

Here (attached) is the A/C Amplifier test procedure from the same ('95.5) FSM.

 

[MatosTaco]

Hey Enola, thank you for your help with this. It turned out that my amplifier was bad, but in the interest of making sure I don't do this again for a long time, I got an OEM amplifier, thermistor, and a pressure switch and popped them in. Once I charged the system, the compressor fired right up and the AC is working once more!

 

[MatosTaco]

All three of these have been replaced with new ones. From left to right: circuit board is the amplifier, sensor looking thing is the pressure switch, and the long grey wire is the thermistor.
20210

 

[Enola Gaia]

Glad to learn you've finally tracked down and resolved the problem!

 

[2k4 Tacoma]

20210

Part Numbers? For future reference...

 

[Enola Gaia]

According to my '01 - '04 factory parts listing ...

A/C Amplifier: 88650-35121 (May 2001 onward)
Pressure Switch: 88645-34010

I can't find a part number for the thermistor. It's not listed as a separate part within the evaporator assembly.