windshield washer pump may have frozen; altho' no fluid has been lost or any leaks found. is it near the headlamp on passenger side and how is it removed?

Just had the AC recharged thinking that was the problem. Still the same. Once the car warms up, the AC blows warm air. Was first told it was a controller under the dash, then told by the same AC mechanic a day later that it could be the switch near the firewall on the passenger side. Another mechani...