Question about 1994 Chevrolet S-10 Blazer

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How many pounds of r134 and how much oil ozs.

How many pounds of r134 and how much oil ozs. for ac.unit

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Somewhere around 1.6 pounds (1lb.14ounces) of R134a if system is evacuated and 3 ounces of oil with new compressor.
keep pressure on the low side around 34-37psi & it should blow snow. Below are normal car AC pressure readings with 134A.

  • Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI
  • Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI –
  • Normal high side reading ranges from 200-350 PSI
Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor.
DIY recharge kit:
With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience. If normal gauge readings are obtained and the vent air is cold – STOP don’t overcharge the system.
Thank you for using fixya and be safe.

Posted on Jul 19, 2010

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  • Chevrolet Master
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About 2lbs of freon,and 8 oz of oil. for front air only,2.5 lbs of freon,and 9 oz of oil for rear air.Please rate if this was at all helpful,thank you.

Posted on Jul 19, 2010

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