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A 2005 Peterbilt 379 typically requires about 30 ounces (approximately 2.5 pounds) of R134a refrigerant for the air conditioning system. The high-pressure side should generally be between 200-250 psi, while the low-pressure side should be around 25-45 psi, depending on ambient temperatures. Always refer to the vehicle's service manual for the most accurate specifications.

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4mo ago

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