Most people want cold air when they are driving in warm weather. If the air conditioner in your Silverado is blowing warm air, adding refrigerant to the system may correct the problem, as long as the components are working properly. You can find an R134 automotive recharge kit at your local automotive parts store to do the job.
Look closely at the air conditioning lines to check for damage. You can use a leak detection kit to make it easier to find leaks. These are available at your local automotive store.
If you see any visible damage, take your Silverado to a professional to recharge the air conditioning system with refrigerant. Find the Low Pressure Side service port. This is located on the line coming out of the compressor toward the engine block.
Take off the black cap that is covering it. Start your truck and turn on the air conditioner. Use the automotive air conditioner pressure gauge to check the Low Pressure Side pressure.
In order to get the most accurate reading, you need ... more.
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