Is it necessary to manually engage a compressor that is not running due to a low charge when trying to recharge? Thank you
No. Put refrigerant in as liquid with the engine off. If you can't get the full charge in that way, then start the engine (the pressure will be enough for the compressor to engage) and complete the charge as gas into the low side.
You should only see this low a pressure on the initial charge after repairs and evacuating. If the refrigerant has leaked out to the point that the compressor won't engage, that is a major leak that needs to be found and repaired first. Simply recharging a car that leaky is only going to last a few days / weeks at best before performance deteriorates.
Thank you yes the system has been evacuated. How do I put refrigerant in as a liquid with the engine off Thanks again
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