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.
Additional ACR4 Operation and Maintenance Tips
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Additional ACR4 Operation and Maintenance Tips
Additional ACR4 Operation and Maintenance Tips
^ Be sure both valves on the ACR4 refrigerant tank are open before beginning any A/C recovery, recycling, vacuum and recharging procedures. This prevents pressure build up in the ACR4 and allows for free flow of refrigerant in and out of the tank.
^ ACR4 vacuum pump oil must be changed every 10 hours of pump operation. The ACR4 has an internal timer to notify when the oil should be changed. The oil level must be set to the correct level per the ACR4 operating manual. An over-filled reservoir will cause slow start-up of the pump, draw excess current and burnout the 15 amp delay reaction fuse in the PureGuard 2. THE PUMP OIL LEVEL MUST BE CHECKED ON A WEEKLY BASIS IF THERE IS FREQUENT FUSE BURNOUT.
^ Be sure both valves on the ACR4 refrigerant tank are open before beginning any A/C recovery, recycling, vacuum and recharging procedures. This prevents pressure build up in the ACR4 and allows for free flow of refrigerant in and out of the tank.
^ ACR4 vacuum pump oil must be changed every 10 hours of pump operation. The ACR4 has an internal timer to notify when the oil should be changed. The oil level must be set to the correct level per the ACR4 operating manual. An over-filled reservoir will cause slow start-up of the pump, draw excess current and burnout the 15 amp delay reaction fuse in the PureGuard 2. THE PUMP OIL LEVEL MUST BE CHECKED ON A WEEKLY BASIS IF THERE IS FREQUENT FUSE BURNOUT.
RENDER: 1.0x
NO RELATED
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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.