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Old 05-14-2022, 03:15 PM   #1
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Default A/c question

I have a 96 sw2 I replaced the compressor and now the gauge readings are 150 on the high side and the low side is going into a vaccum someone said the condenser is bad ?
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Old 05-14-2022, 09:55 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: A/c question

There's a point when refrigerant loss results in different operating pressures. Briefly put, normal system pressures will show low side between 30-35 psi while high side varies between 125-250 psi in proportion to outside temperature and humidity. I'm guessing your pressure measurement was at idle rpm. The S-series require 2k rpm for measuring operating pressures because they vary greatly between idle and 5600 rpm (or whatever programmed rpm limits are). At idle rpm, low side should never show vacuum as this indicates one issue universal to every vehicle ac system - the leak no one wants to address.

Every ac system (room air unit, central hvac, freezer, refrigerator, truck trailer reefer) are sealed units. Every ac system is under pressure when not run. Vehicle ac system standby pressures will be around 75 psi in warm temperatures. A 12oz can of r134a has about 70 psi. With your system off, standby pressures are most likely low on both sides. When a system leaks with loss of refrigerant occurring, less refrigerant returns to the compressor resulting in a vacuum reading while the discharge side may have pressure. There are no published pressures for varying losses of refrigerant from a leak. The only other possible reason for your low pressure reading might be sealer use. Sealer is a temporary fix and not a repair as it contaminates a system and can seal or block off passages that can interfere with compressor operation. Sealer reacts to air or moisture, both evacuated from a new or repaired system before installing refrigerant. Refrigerant, oil and dye are the only things circulating in refrigeration systems. Anyone using sealer for a quick fix basically contaminates the system and it may not work resulting in a more expensive repair since a proper repair would require complete disassembly to thoroughly flush all oil and sealant from a system. The condenser may be damaged from sealer and cannot be completely flushed to rid it of sealer if it hasn't already reacted to seal passages. R134a condenser coils are flat tubes that can trap debris and allow sealer to seal if air or moisture entered from incorrect repairs.
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