Frequently Asked Questions About Mack Superliner Truck AC Driers & Compressors

Will these AC components fit my specific Mack Superliner model year?

Our AC driers and compressors are designed to fit Mack Superliner trucks from 1985 through 2001. However, there were mid-year changes in some model years, particularly in 1993 and 1997. We recommend checking your VIN or existing part numbers before ordering. If you're unsure, contact our support team with your truck's VIN and we'll verify compatibility for your specific model.

Do I need to replace both the drier and compressor at the same time?

While not always necessary, replacing both components together is strongly recommended if your compressor has failed. A failed compressor often releases metal particles and debris into the AC system, which can contaminate the drier. Installing a new compressor with an old, potentially contaminated drier can lead to premature failure. If only your drier needs replacement due to moisture saturation, you can replace it independently.

What tools and additional parts do I need for installation?

For a complete installation, you'll need standard mechanic tools plus AC-specific equipment including a vacuum pump, manifold gauge set, and refrigerant recovery system. Additionally, you'll need new O-rings, PAG oil (typically 8-10 ounces for a full system), and R134a refrigerant. Don't forget to replace the orifice tube or expansion valve during service. Professional AC work requires EPA 609 certification for handling refrigerants.

How can I tell if my compressor is OEM style or aftermarket?

Mack Superliners came with either Sanden or Seltec (Valeo) compressors from the factory. OEM Sanden units typically have a silver/natural aluminum finish with model numbers like SD709 or SD7H15. Seltec compressors are often black and marked as TM-15 or TM-16. Check the label on your existing compressor for model numbers. Our product listings specify which OEM style each replacement matches.

Why is my new compressor cycling on and off frequently?

Short cycling usually indicates incorrect refrigerant charge, a faulty pressure switch, or a clogged orifice tube. First, verify the system has the correct refrigerant amount (typically 2.5-3.5 lbs for Superliners). Check both high and low pressure readings - low side should be 25-35 PSI at idle. If pressures are correct, inspect the pressure switches and wiring. A clogged orifice tube from previous compressor failure debris is a common culprit that requires system flushing.