Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
A/C Compressor Overhaul - DAV5: Description
The 5-cylinder Harrison DA V5 compressor is an infinitely, variable displacement compressor, matching vehicle A/C demand under all conditions without cycling on and off. Using the DA-6 6-pole clutch, the DA V5 features a variable angle swashplate and 5 axially located piston-cylinder assemblies.
Compressor displacement is controlled by a bellows-actuated control valve in the compressor's rear head. This valve senses compressor suction pressure. The swashplate angle and compressor displacement are controlled by crankcase-suction pressure differential.
When A/C capacity demand is lower and suction pressure will be above the control point, the valve will bleed discharge gas into the crankcase. The valve also closes a passage from the crankcase to the suction plenum, providing smaller displacement.
The swashplate angle is controlled by the force balance on the 5 pistons. A slight increase of crank-suction pressure differential creates a total force on the pistons. This causes a movement about the swashplate pivot pin, reducing the swashplate angle.
The compressor is self-lubricating, collecting up to 4 ounces of oil in the crankcase. The crankcase-suction bleed is routed through the rotating swashplate. Rotation separates and removes some of the oil from the bleed, re-routing it to the crankcase for component lubrication.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.