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.
1990 Chevrolet Blazer 5.7 K, StandardFACTORY OEM SERVICE PROCEDURE
Refrigerant Recovery
CAUTION:
If variation is noted in service procedures, follow the manufacturer's instructions on refrigerant recovery/recycle system.
- Close both valves on manifold gauge set. Connect manifold gauge set to high and low side service valves.
- Connect center hose on manifold gauge set to inlet port on Refrigerant Recovery/Recycle System (J-38100-B). Start engine. Turn A/C on for approximately 2 minutes.NOTE: Operating A/C for 2 minutes will warm the refrigerant so refrigerant recovery/recycle system can recover more refrigerant from the system.
- Shut engine off. Open BOTH valves on manifold gauge set. Open BOTH valves on refrigerant recovery/recycle system storage tank at the same time.
- Plug refrigerant recovery/recycle system in and turn power switch on. Depress compressor START switch and note that the compressor ON light is activated.
- The refrigerant recovery/recycle system will shut off when a vacuum reading of 17 in. Hg is obtained on manifold gauge set. Manifold gauge vacuum reading should remain at 17 in. Hg for at least 2 minutes.
- If reading increases to above zero, refrigerant still remains in the vehicle A/C system. Depress compressor START switch and operate refrigerant recovery/recycle system through another cycle.
- Once refrigerant is recovered, open accumulator pressure valve on the refrigerant recovery/recycle system for 15 seconds. This will pressurize the oil separator so refrigerant oil can be drained.
- Open OIL DRAIN valve on the refrigerant recovery/recycle system and drain refrigerant oil into a container. Measure exact amount of oil to be added when system is put back in service.
Factory Service Tools
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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.
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