Peterbilt 359 AC Condensers

Frequently Asked Questions About Peterbilt 359 AC Condensers

What years do these AC condensers fit, and will they work with my specific Peterbilt 359 model?

Our AC condensers are designed to fit Peterbilt 359 models from 1967 through 1987. However, there are variations depending on whether you have a standard hood or extended hood model. For 1967-1985 models, most condensers are direct replacements. For 1986-1987 models, you may need to verify your existing mounting bracket style, as Peterbilt made some changes to the HVAC system in these later years. We recommend checking your OEM and existing condenser part number before ordering.

Are these aluminum or copper/brass condensers, and which is better for my truck?

We carry both aluminum and copper/brass condensers. Aluminum condensers are lighter weight and provide excellent cooling efficiency with modern parallel flow designs. They typically cost less but may be more susceptible to road debris damage. Copper/brass condensers are heavier but extremely durable and easier to repair if damaged. Many owner-operators prefer copper/brass for long-haul applications due to their longevity. Both types will provide proper cooling when correctly sized for your system.

What size condenser do I need, and how do I measure for proper fitment?

Peterbilt 359 condensers typically come in three main sizes: 18" x 22", 20" x 24", and 22" x 26". To determine your size, measure your existing condenser core (not including the mounting brackets) width by height. The most common size is 20" x 24" for standard applications. If you have an upgraded or aftermarket AC system, you may have a larger condenser. Also check the inlet and outlet fitting sizes - most use #8 and #10 fittings, but some variations exist.

Can I install this myself, or do I need special tools and expertise?

Installation requires intermediate mechanical skills and proper AC service equipment. You will need a refrigerant recovery system, vacuum pump, manifold gauges, and the ability to properly evacuate and recharge the system. The physical mounting typically takes 2-3 hours and involves removing the grille, disconnecting AC lines, unbolting the old condenser, and reversing the process. Many customers choose professional installation to ensure proper refrigerant handling and system performance. If you do it yourself, always replace the receiver/dryer and expansion valve when changing the condenser.

Why is my new condenser not cooling as well as expected?

Poor cooling after condenser replacement usually indicates other system issues. Common causes include: insufficient refrigerant charge (system should be charged to manufacturer specifications, not just "until it feels cold"), a failing compressor that cannot maintain proper pressure, clogged expansion valve or orifice tube restricting flow, or inadequate airflow through the condenser from a damaged shroud or weak fan clutch. The condenser is just one component - the entire system must work together. We recommend having system pressures checked and comparing them to Peterbilt specifications to diagnose cooling problems.