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If I read the question correctly, you are switching between fan mode and cool mode. In fan mode there is no cooling going on, just the fan running, therefore there would be no line freeze. When in cool mode. Your probably just not getting enough air across the coil. #1. It could be a dirty air filter. #2 Make sure all your registers are open. A common mistake for the home owners is to close down rooms or vents thinking it will save energy. This restricts the air flow across the coil. #3 Another is to check to insure your the blower fins are clean. #4 Check that there are no restrictions on the return air side. #5 If you have a two speed blower model, it should be running at high speed when in cooling mode. If neither of those seem to be the problem, it could also be that the last person to work on it put in too much refrigerant or did not wire up the two speed mode correctly if your model supports it.

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Q: If the thermostat is set to cool why do the lines outside freeze but if the fan is on continuously they don't freeze?
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