BT5-42081 Heavy-Duty A/C Compressor – TM-08HD, 12V, 6-Groove

The BT5-42081 A/C compressor is built for mobile air-conditioning systems that require consistent cooling and dependable operation. Because it uses the proven TM-08HD compressor platform, it delivers steady refrigerant flow while maintaining compact size and efficient output.

In addition, the alternator-mount design provides stable alignment and simplifies integration in applications that share mounting architecture with alternator brackets. As a result, installation remains straightforward while belt tracking stays consistent.

Furthermore, the body-mounted male insert O-ring fittings (#8 and #10) allow clean hose routing and secure sealing. Therefore, leak risk is reduced and long-term system reliability improves.

The BT5-42081 operates on a 12-volt electrical system and uses a 6-groove serpentine clutch with a 123 mm diameter. Because it supports CW and CCW rotation, this compressor adds flexibility across a wide range of OEM and retrofit installations.

Specifications

General

• BTRAC Part Number: BT5-42081

• Compressor Model: TM-08HD

• Application Type: Multi-Fit

• Refrigerant Type: R134a

Mounting & Head

• Mounting Type: Alternator Mount

• Head Type: Body Ported

• Fitting Port Position: Body Mount

• Fitting Style: Male Insert O-Ring

• Fitting Sizes: #8 and #10

Clutch & Drive

• Clutch Diameter: 123 mm

• Clutch Grooves: 6

• Belt Type: Serpentine

• Shaft Type: Splined Shaft

Electrical

• Voltage: 12 V

• Wire Type: 1-Wire Bullet

• Rotation: CW / CCW

• Diode Protection: None

Internal

• Number of Cylinders: 6

• Compressor Displacement: 5.2 cu.in.

• Oil Type: PAG 46

Service Parts

• Replacement Clutch Assembly: NSS

• Replacement Head Assembly: NSS

• O-Ring #1: 0013

• O-Ring #2: 0015

Cross Reference Numbers

• MEI: 5933

• CoolStar / MEI: 340-1140

• ICE: 2521257

• Seltec / Valeo: 435-52081, 488-42081

• Valeo / Seltec: 10052081, 100-52081

• Truck Air / MEI: 03-3110

Applications & Notes

• Multi-fit mobile HVAC systems

• Light to medium-duty trucks and equipment

• Alternator-mount A/C compressor applications

However, always verify mounting configuration, belt alignment, port orientation, oil type, and electrical requirements before installation to ensure proper system performance.