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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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| 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...
