A/C low pressure is too high

[yeeha68]

Hello All,

My A/C has been getting warmer over the last week to the point of just warm air.  The compressor is engaging as I can see, hear, and watch the tach drop slightly as it does.  I figured it just needed a quick recharge, but the low side pressure is ridiculously high at 90psi.   Before I go and pull the world apart does anyone have experience with this scenario?  Does this point to a bad compressor or Refrigerant Control Valve?  I'm not really finding anything in the search dialog.

I have a vacuum and used it on other cars, but have never seen this "overcharge" high pressure issue.  I guess I'll try to lower the pressure first, but I have my doubts it will fix anything.

Thanks in advance for any input.

-k

 

[Ahsai]

Was it measured while the compressor was running? 90PSI sounds like static pressure (when compressor is not running).

[yeeha68]

Yes, both.  It is 90psi while the compressor is running and 90psi while off

[Ahsai]

Sounds like your compressor is not pumping at all then. The compressor is of variable type and it's controlled by the computer based on multiple inputs. I think it will be wise to scan the a/c system with a Durametric to check for any error codes before you starting ripping out anything.

[yeeha68]

Durametric scan came back clean.  Everything checks out correct...  But its not. 

I guess I'll take a closer look at the compressor and pressure ranges again and then report back.