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Low side and High Side Pressure

abbouddi on Thu March 12, 2009 7:20 AM User is offline

Year: 2007
Make: Mazda
Model: 6
Engine Size: 2000 cc
Refrigerant Type: R134a
Ambient Temp: 30 deg c
Pressure Low: 22 psi
Pressure High: 210 psi
Country of Origin: Saudi Arabia

I recycled my old refrigerant and added new refrigerant as per manufacturer specification (470 grams). But in the workshop manual they mentioned to check low side and high side pressures with temperature to be in the range. For our temperature 30 deg celsius I got low side pressure 22 psi and high side pressure 210 psi, which are more than illustrated in the figure. And I am sure that I recharged the exact quantity and vent is cold enough. Any comment for my pressures readings?

Chick on Thu March 12, 2009 7:38 AM User is offlineView users profile

Could be just a high heat load, did you pull a deep vacuum, make sure the fan is running properly etc.. Did you check the pressures before recycling your refigerant? was there a reason you did that? Any air in the system can raise the pressures, but if it's blowing cold, it could just be the system working hard due to heat and humidity..

Email: Chick


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mk378 on Thu March 12, 2009 12:48 PM User is offline

Do they specify an engine rpm for the test? Bringing the engine up to about 1500 rpm instead of just idle should drop the low side some.

The high side being in the proper range suggests the system is properly charged and free of air and other problems. I would not worry about the low side being exact as long as the air is cold.

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