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.
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HOMESERVICE MANUALSJEEP1991CHEROKEE 2WD L4-150 2.5L VIN P MFIREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGSERVICE AND REPAIRREFRIGERANT SYSTEM EVACUATE
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFI
Refrigerant System Evacuate
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFISECTION Refrigerant System Evacuate
A vacuum pump is built into the charging station and is constructed to withstand repeated and prolonged use without damage. Complete moisture removal from the system is possible only with a vacuum pump constructed for the purpose.
The system must be completely discharged before it can be evacuated. Damage to the vacuum pump may result if pressurized refrigerant is allowed to enter.
1. Connect hose to vacuum pump if system was discharged through charging station.
2. Open high and low side gauge valves of charging station.
3. Connect station into 110-volt current.
4. Engage "Off-On" switch to vacuum pump according to directions of specific station being used.
5. System should pump down into a 28 - 29 1/2 inches vacuum in not more than 5 minutes. If system fails to meet this specification, repair as necessary.
6. Operate pump a minimum of 30 minutes to remove all air and moisture.
7. Close high and low side gauge valves. Open switch to turn off pump.
8. Check ability of system to hold vacuum by watching compound gauge to see that it does not rise at a rate higher than 1 inch of vacuum every 4 or 5 minutes. If rise rate is not within specifications, repair system as necessary. If rise rate is within specifications, charge system with refrigerant.
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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.