Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to put freon in an ac unit [title] Check for vents blowing warm or room temperature air. [step] This is a tell-tale sign that your unit needs a refill of refrigerant. However, a broken thermostat may cause the same problem.

Ending1: If it's a refrigerant issue, the air temperature will steadily grow warmer over time because your unit is slowly losing refrigerant. [substeps] If a broken thermostat or other issue is causing the warm air, the temperature of the air will probably spike or fluctuate. Ending2: Check for vents the next time you have an unscheduled problem or have to shut the unit down. [title] Shut down the ac valve, using the air conditioner faucet or oven mitts to close it. Ending3: For instance, a broken heating unit may have access to the very top of a cabinet under a firelight. The leak may seem to occur from below you but/or in the electrical system, with the model you're buying still not operating with your thermostat. Ending4: [substeps] Most broken thermostats are air conditioners that have a broken vent or mixer. This is because a homemade model will pass the air over the exhaust pipe, rather than down to the floor or inside the unit.

Answer format: ending1/ending2/ending3/ending4