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| Vacuum
and the auto A/C |
Q: How
does air get into the system when I am recharging or adding refrigerant?
A: Typically when
recharging the A/C
system, the system is vacuumed, and you will not get air into the A/C
system. However, when adding refrigerant or 'topping off' the A/C system,
you can easily get air into the system right from the hoses on your
gauge set. Before connecting
to the system, if your gauge set hoses do not have refrigerant in them (being
held by the quick
couplers) then they are full of air. Connecting them to your A/C system
and then adding refrigerant or freon will cause the air to be pushed into
the system. Longer charge hoses create a bigger problem. To eliminate this,
simply 'purge' the hoses. That's done by 'cracking' the hose at the threaded
connection. Usually opening that connection about 1/4 to 1/2 turn will cause
refrigerant to leak. Once you're leaking refrigerant, you know you have the
air removed or purged from the charge hose. You're ready to add
refrigerant.
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| Tired of looking all over
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only 'perpetual' A/C service manual that is constantly updated! Best of all,
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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...
