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A/C Cycling

intravino on Mon May 24, 2010 2:07 PM User is offlineView users profile

Year: 1996
Make: Mercury
Model: Mystique
Ambient Temp: 75
Pressure Low: 25-45
Country of Origin: United States

Hello,

I've repaired my A/C thanks to this Forum in 2005.

Now, my A/C Cycling at every 6 seconds.


I only have the low pressure gauge, It's goes from 25 psi to 45 psi.


Thanks,

Intravino

HVargas on Mon May 24, 2010 3:37 PM User is offlineView users profile

Quick cycling is a sign of low refrigerant. The only real way to see if the system is fully charged is to have it recovered and see how much is pulled from the system. Are you able to tell static pressure with the low side gauge?

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intravino on Mon May 24, 2010 10:12 PM User is offlineView users profile

Quote
Are you able to tell static pressure with the low side gauge?

Yes, 45 PSI.


Thanks,

HVargas on Tue May 25, 2010 11:10 AM User is offlineView users profile

That is very low for a system. Depending on ambient temperature, you want a static pressure of at least 90psi I would say for that car. The higher the ambient temperature, the higher the static pressure. I would start checking for leaks.

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: Arizona Mobile Air

intravino on Tue May 25, 2010 11:19 AM User is offlineView users profile

intravino on Tue May 25, 2010 11:24 AM User is offlineView users profile

Quote
stactic pressure

I measured it with the car off, is that ok?

It's possible that the system is low, my friend took out some gas with his machine but I 'm not sure if put enough.


I have a can from Kmart with r134, Can I fill it to 90 PSI at static?


Thanks again.

mk378 on Tue May 25, 2010 11:27 AM User is offline

Static pressure is indeed measured with the car not running, after it has been off for a period of time for pressure to equalize.

At 45 psi there is only a few oz of refrigerant left in the system. There is a fairly large leak that needs to be found and repaired. Then evacuate and recharge by weight to the manufacturer's specification. Static pressure doesn't mean much as far as the state of charge other than to tell you that it's almost completely empty.

intravino on Tue May 25, 2010 2:28 PM User is offlineView users profile

I know that before I went to my friend, the low pressure was in the red of the gauge 100 PSI when the system running, A/C on.


Thanks,

Chick on Tue May 25, 2010 6:39 PM User is offlineView users profile

You need "real" gages, not a single gauge, your doctor wouldn't take your blood pressure with one number would her?? throw that can in the thrash and get a good set of manifold gages, and follow the advice given to evacuate the system, and recharge the factory amount back into the vacuum..

manifold sets

DIY starter kits with a vacuum pump

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Chick
Email: Chick

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