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Old 03-18-2013, 11:24 AM
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Should I charge the AC system before first start

Hi,
I just rebuilt my first engine. Everything is in and ready to be started.
I'm wondering if I need to charge the AC before the first start. My concern is that if I messed up on something then I'll have pull it back out and redo something. This will involve having to drain the AC charge which can turn into a drawn out issue. Will I damage the compressor if I run it dry for 1/2 hour.
Thanks
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Old 03-18-2013, 11:32 AM
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Just dont have the pump wire connected - then it wont turn on. What vehicle do you have? Some have a low limit switch that will not allow it to come on too.
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Old 03-18-2013, 12:33 PM
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Originally Posted by 33Willys77 View Post
Some have a low limit switch that will not allow it to come on too.
I get the same people pulling in my driveway every summer. My ac doesn't work " I think the compressor is shot" . Then you hook up the refrigerant and, the instant you crack the bottle it switches on.

Sometimes the engine is squealing and they tell you, the engine through a bearing. You take a listen underneath, and it is the AC tensioner pulley bearing.

On start up it is not going to be On. Break the engine in first.
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Old 03-18-2013, 02:40 PM
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Quote:
Originally Posted by Infinite Monkeys View Post
Hi,
I just rebuilt my first engine. Everything is in and ready to be started.
I'm wondering if I need to charge the AC before the first start. My concern is that if I messed up on something then I'll have pull it back out and redo something. This will involve having to drain the AC charge which can turn into a drawn out issue. Will I damage the compressor if I run it dry for 1/2 hour.
Thanks
1) the compressor doesn't spin unless the clutch is ingauged..
in otherwords unless you have the a/c on OR the defrozer on. it will not cycle the clutch..
and NO don't charge it untill you break it in and are sure you are good to go..
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Old 03-18-2013, 02:41 PM
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Thanks guys. I appreciate the help.
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Old 03-19-2013, 06:55 AM
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I would just like to add something about the oil in the compressor. Before you go any further, you need to see how much oil is in it. Some come with oil and some do not. Each system requires a specific amount of oil. Dont just dump some in. If you do not have any idea how much oil is in there then you need to remove the compressor, take out the fill plug and drain it upside down until it is empty. The refilled it with the precise amount and correct type of oil.
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