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 CONDITIONINGCOMPRESSOR HVACSERVICE AND REPAIRISOLATING COMPRESSOR
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFI
Isolating Compressor
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFISECTION Isolating Compressor
Fig. 1 Cross-Sectional View Of Compressor Service Valves:
1. Connect suitable gauge manifold to system and remove protective caps from manual valve stems.
2. Slightly open both service valves toward mid-position, then start engine and operate air conditioning.
3. Slowly rotate suction (low) side service valve clockwise toward front-seated position.
4. When suction (low) side gauge reads zero, stop engine, then rotate both low and high side valves to the fully clockwise (front-seated) position.
5. Relieve internal compressor pressure on Sankyo 5 cylinder and York 2 cylinder compressors, by slightly loosening the oil sump filler plug. A suitable face shield should be worn when relieving compressor pressure.
RENDER: 1.0x
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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.