Frequently Asked Questions About Hino 238-338 Truck AC Driers & Compressors

Will these AC components fit my specific Hino truck model year?

Our AC driers and compressors are designed to fit Hino 238 and 338 models from 2005-2010. However, there are variations between cab configurations (standard vs. crew cab) that may affect mounting brackets. We recommend checking your VIN or calling our technical support team at 1-888-875-7787 with your truck's specific year and model number to ensure proper fitment before ordering.

How difficult is it to replace the AC compressor myself, and what tools do I need?

Replacing an AC compressor requires intermediate mechanical skills and specific tools including a manifold gauge set, vacuum pump, and refrigerant recovery system. The job typically takes 3-4 hours and involves removing the serpentine belt, disconnecting refrigerant lines, and unbolting the compressor from its mounting bracket. Professional installation is recommended if you lack AC system experience, as improper installation can damage the entire AC system.

How often should I replace the receiver drier when servicing my AC system?

The receiver drier should be replaced every time the AC system is opened for major repairs, especially when replacing the compressor. Even if the drier appears functional, moisture contamination occurs once the system is exposed to air. Failing to replace the drier when changing the compressor is the leading cause of repeat compressor failures and typically voids warranty coverage.

What's the difference between OEM and aftermarket compressors for my Hino truck?

OEM compressors are manufactured to Hino's exact specifications and typically cost 40-60% more than aftermarket options. Quality aftermarket compressors from brands like Denso and Sanden offer comparable performance and durability at a lower price point. The main differences are warranty length (OEM usually offers 2 years vs. 1 year for aftermarket) and clutch assembly design. Both options use the same refrigerant capacity and mounting configurations.

Why is my new compressor making noise, and is this normal during break-in?

Some clicking or light humming when the clutch engages is normal for the first 50-100 miles as internal components seat properly. However, grinding, squealing, or loud knocking indicates improper installation, incorrect refrigerant charge, or contamination in the system. These symptoms require immediate attention to prevent catastrophic failure. Ensure your system was properly evacuated and charged with the correct amount of PAG oil and R134a refrigerant (typically 1.8-2.2 lbs for Hino 238/338 models).