Just need a little input on trouble shooting the A/C system on my 96 sl1

Static Pressure apx 80psi

At Idle Low Side 50psi@750rpm drops to 30psi@1500 rpm and >
Hi Side 100psi@750rpm starts to climb 110-115psi@1500 and >

From what I can tell I would say the compressor is shot, but just wanted verification on my conclusion.

Thanks

 

Which of the following questions are true??

1) Cool air output is inadequate
2) Cool air output is intermittant
3) Cool air output is non-existant

 

3) Cool air output is non-existant

 

OK -

You already listed the pressure readings when you had the system both OFF and ON.

OFF readings would indicate that you have a full refrigerant charge in the system (but this is not conclusive proof).

1) When you have the system ON, and you are getting the readings you mention, is the compressor running continuously, or is it cycling ON and OFF repeatedly?
2) When the compressor is running, does it make any rattle, clunk, or other internal noises?
3) Are there any moisture or frost building up on any of the high pressure lines or the expansion valve?

 

Thanks for the help...

1) When you have the system ON, and you are getting the readings you mention, is the compressor running continuously, or is it cycling ON and OFF repeatedly?

Compress kicks on when a/c is turned on...does not cycle off

2) When the compressor is running, does it make any rattle, clunk, or other internal noises?

Sort of a Buzzing like sound at idle..goes away above an idle..

3) Are there any moisture or frost building up on any of the high pressure lines or the expansion valve?

No moisture or frost..no detectable change in temperature at expansion valve.

 

From what you list here, it is either:

1) Faulty compressor reed valve --> compressor teardown and overhaul

2) Compressor internal fault --> compressor replacement

Sorry to rain on your parade.....

 

Thanks...

That is what I was guess...but didn't want to pull the compressor and dryer..and find out that after recharging the system...I should have pulled the expansion valve...

 

There's no moisture/frost buildup on the high side pipes or on the expansion valve itself, I don't think the expansion valve is stuck closed. Insufficient high side pressure means either the reed valves are leaking back (not holding pressure) or the compressor is not doing its job.

 

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