A/C not blowing

[Monica T]

My a/c blows cold for 20 miles, then I can only feel it if I put my hand up to the vent. I've been told it could be too much refrigerant or the blower or a valve! Any ideas?

[Tom Greenleaf]

Welcome:
Need to know a lot more about this. Year, make, model, miles and any history that may help. ? Who or why could there even be too much refrigerant? It doesn't change by itself,

[Cornbinder89]

Sounds like the evaporator is icing over, but like Tom said we need more info.

[Cusser]

Or most of the air is being diverted to the windshield or under the dash by a vent door/flap issue.

[anytimehvac]

I think you need to clean or replace air filter from your ac because the air filter comes in the front of evaporator. The air filter should be cleaned at regular interval.