Where is the low side of ac in a 1990 f150?
The low side of the AC system on a 1990 Ford F-150 is typically located on the passenger side of the engine compartment, near the firewall. It's usually a smaller diameter line than the high-pressure side and will be noticeably colder when the AC is running. However, exact location can vary slightly depending on specific model and trim level. It's best to consult a repair manual specific to your truck's year and engine for a definitive location. Look for a diagram of the AC system.