Volvo: Volvo V70 airconditioner fails, volvo v70 1999, engine coolant

Question
Volvo V70 1999. 130K.

The airconditioner shuts off when you turn the fan up to 4. If
you keep it at 1 or 2 completely fine.

We were told of a tiny hole -- that would mean the coolant
would leak out over a long period of time -- but the
airconditioner works fine at fan speeds 1 and 2.

We are driving to Florida in early August. Should we get a
coolant charge? (will that help it at fan speeds 4 and 5?)

Thanks in advance.

Answer
Craig,
If you are all right with the lower blower speeds, leave it alone. No harm will be done.
A leak in the A/C system is freon that leaks out, along with a small amount of oil. If enought freon leaks the A/C will not cool properly.
By coolant change do you mean engine coolant? If so and it has been a long time between changes by all means have it changes along with a thermostat.
Charging the system and or changing coolant will not stop a leak or allow the 4th speed to work.