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Ac Compressor Does Not Turn On


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Hi,

I have a 94 Sc400 and when you call for cold the air blows and indicates cool but the ac compressor does not turn on. Does anyone have a block diagram or do you know if the freon is low if it will not allow the compressor to start. Is this system r134a?

Also I have a power tilt unit that does nothing - no noise. I noticed a posting by a Sirsam but I am not sure if or how he solved his problem. The unit makes no noise and appears as if there is not power going to it but all fuses working properly.

Any input will be greatly appreciated.

Thank you!!

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  • 2 weeks later...

Hi,

I have a 94 Sc400 and when you call for cold the air blows and indicates cool but the ac compressor does not turn on. Does anyone have a block diagram or do you know if the freon is low if it will not allow the compressor to start. Is this system r134a?

Also I have a power tilt unit that does nothing - no noise. I noticed a posting by a Sirsam but I am not sure if or how he solved his problem. The unit makes no noise and appears as if there is not power going to it but all fuses working properly.

Any input will be greatly appreciated.

Thank you!!

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Hi,

I have a 92 sc400 also and the same thing happens. My friend tested it and found a leak of refrigerant, R12, at the evaporator pressure regulator connection in the line. My friend mostly works on American cars and said he didn't have the right tools to fix it. I found the part at a local (non chain) auto parts store for $33.00. The compressor stops working when you run out of R12 due to lack of pressure in the system, so your compressor may be OK. I haven't found a local mechanic that I trust to fix it yet, but I am looking. The local Lexus dealer has done shoddy, over priced work on my car 2x so I don't go to them anymore.

Any info from anyone out there would be greatly appreciated.

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  • 4 months later...

Hi,

I have a 92 sc400 also and the same thing happens. My friend tested it and found a leak of refrigerant, R12, at the evaporator pressure regulator connection in the line. My friend mostly works on American cars and said he didn't have the right tools to fix it. I found the part at a local (non chain) auto parts store for $33.00. The compressor stops working when you run out of R12 due to lack of pressure in the system, so your compressor may be OK. I haven't found a local mechanic that I trust to fix it yet, but I am looking. The local Lexus dealer has done shoddy, over priced work on my car 2x so I don't go to them anymore.

Any info from anyone out there would be greatly appreciated.

Ill take if from here...put a little bit of R12 in and then take some soapy water and coat the line where the suspected leak is and the air should show itself by blowing bubbles at the leaking spot however just a little bit of soapy water don't try to bathe the line in it or...jack it off...Giggidy.

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