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| Recharging
& refrigerant (freon) for the auto A/C |
Q:
What's the problem with topping off an A/C system that's low on refrigerant?
A: The problem is that
you can never tell how much refrigerant is in the system before you start
to top it off. You test and diagnose A/C system using manifold gauges. They
provide a pressure reading. That pressure reading is in no way related to
the amount (weight) of refrigerant in the system. Therefore, you can never
be sure of how much is already in the system. Above that, late model vehicles
now have a full spec charge of just several ounces (as opposed to older
applications that were between 3 and 4 pounds of refrigerant). If the total
charge is 20 or 25 ounces, being 'off' by 4 or 5 ounces could be the difference
between cooling and no cooling. You should always recover the refrigerant
in the system, pull deep vacuum for at least 1/2 hour (to remove air and
moisture) and recharge with the full factory specification refrigerant charge.
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| Tired of looking all over
the place to get all the right auto A/C service information and help? Then
download your own copy of the AutoACconnection! It's the worlds first and
only 'perpetual' A/C service manual that is constantly updated! Best of all,
it's free! |
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| Our list of FAQ's is growing,
so please visit back often. If you can't find the right answer here, visit
the auto A/C help
and discussion board at the COOL ZONE. You'll get all the right answers
to your questions about troubleshooting and diagnosing auto A/C systems. |
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This
was probably one of the best books on recharging air conditioning that I
have seen...
