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 MANUALSACURA19983.5RL SPECIAL EDITIONREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 15 (A/C-HEATER SYSTEM)TROUBLE SHOOTINGA/C SYSTEM DOES NOT OPERATE
1998 Acura 3.5RL Special Edition
A/C System Does Not Operate
1998 Acura 3.5RL Special EditionSECTION A/C System Does Not Operate
WARNING: This page is about a different car, the 1998 Acura 3.0CL and 1998 Acura 2.3CL. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect A/C pressure switch 2-pin connector and turn ignition on. Check for voltage between ground and Red/White wire terminal of A/C pressure switch 2-pin connector. If battery voltage exists, go to next step. If battery voltage does not exist, repair open Red/White wire between A/C pressure switch, A/C diode and climate control unit.
- Turn ignition off. Check for continuity between terminals of A/C pressure switch. If continuity does exist, go to next step. If continuity does not exist, check for A/C system pressure. See specifications in A/C SYSTEM PERFORMANCE under TESTING. If pressure is not to specification, repair refrigerant portion of A/C system. If pressure is to specification, replace A/C pressure switch.
- Reconnect A/C pressure switch. Remove stereo unit and disconnect climate control 20-pin connector. Turn ignition on. Check for voltage between ground and terminal No. 10 (Blue/Yellow wire) of climate control unit 20-pin connector. See Figure . If battery voltage does not exist, repair open Blue/Yellow wire between A/C pressure switch and climate control unit.
- If battery voltage does exist, check for loose wires or poor connections at climate control unit 20-pin connector. If connections are okay, substitute known-good climate control unit and recheck. If symptom does not exist after substituting known-good climate control unit, replace original climate control unit.
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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.