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2005 volvo: compressor installed and rec dryer.system

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i have a 2005 volvo...
i have a 2005 volvo 670 with volvo power.a/c not working proper.new compressor installed and rec dryer.system charge with 3.75 pounds of r134a.when system comes on low pressure jumps to 60 after 1 min and when it starts to drop compressor comes back on for 1 sec and low pressure jumps back up and compressor shuts off.

thanks steve
Submitted: 8 years ago.Category: Heavy Equipment
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Answered in 1 hour by:
6/11/2010
Technician: Wayne, Journeyman replied 8 years ago
Wayne
Wayne, Journeyman
Category: Heavy Equipment
Satisfied Customers: 11,341
Experience: 34 years experiance as engine rebuild and problems.Thermo-King repair and trouble shooting.
Verified
Hi I'm Wayne,
I will help you with this,

what is the reading on the High side gauge Running and not running ??
60lbs low side is normal, compressor running,
However it should be the same as High side, A/C not running.

Let me know Cool
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