Description

Infiniti G35 Coupe 2004 Service Manual – Automatic Air Conditioner Section

If you’ve ever tackled an A/C job on a G35 and ended up with a compressor that locks up or a refrigerant leak you can’t find, you already know the cost of guessing. This Infiniti G35 Coupe 2004 Service Manual gives you the factory procedure – no aftermarket shortcuts, no missing torque specs. It’s the section that Infiniti dealership techs use. At 162 pages, it covers the automatic A/C system from the one-touch joint to the self-diagnosis function. Start with the SRS precautions on page 5 before you even open the hood.

Infiniti G35 Coupe 2004 Service Manual: What This Section Covers

This isn’t a generic reprint. It’s the factory-issued PDF for the 2004 model year G35 Coupe, specifically the automatic air conditioner system. The table of contents walks you through: Precautions (including SRS, battery, HFC-134a handling), Preparation (special service tools list), Refrigeration System (variable displacement compressor, pressure sensor, relief valve), Lubricant maintenance (compressor oil adjustment), Air Conditioner Control (LAN system, self-diagnosis, fail-safe function), and Trouble Diagnosis (wiring diagrams, CONSULT-II operation, operational checks). You get the same diagnostic flow that Nissan service writers follow.

SRS Precautions: Why You Disconnect the Battery

The first thing you need to know is on page 5. The SRS – air bags and seat belt pre-tensioners – can be set off by static discharge or accidental power. The manual states: disconnect the battery and wait at least three minutes before working near any SRS components or wiring. Even if you’re only pulling the dash for an evaporator core, you must identify the SRS harness. Ignore this and you could be looking at a deployed air bag and a $3,000 repair. This section also covers battery service precautions and the specific steps for handling HFC-134a refrigerant – including contaminated refrigerant disposal. Don’t skip it.

Refrigerant System: HFC-134a and Contamination

The manual dedicates six pages to working with R-134a. It details the one-touch joint design, O-ring part numbers with specifications, and the proper service tools – recovery/recycling equipment, electronic leak detector, manifold gauge set, vacuum pump, and refrigerant weight scale. It even includes a calibration procedure for the ACR4 weight scale. If you’ve ever mixed refrigerant types, you know the mess. This manual walks you through identifying contaminated refrigerant and what to do when you find it. The freez protection and pressure sensor diagnostics are factory-direct.

Lubricant Adjustment on Page 26

Compressor oil quantity is critical on the V-6 variable displacement compressor. Page 26 gives the exact lubricant adjustment procedure for component replacement – both for parts other than the compressor and for compressor replacement itself. It spells out the lubricant return operation and how to measure the correct amount in ounces. Use the aftermarket chart and you might overfill or underfill. The factory spec is here: ND-OIL8 or equivalent, with precise refill amounts depending on which component you swapped. No guesswork.

Run the Self-Diagnosis Before You Touch Anything

The Air Conditioner Control section includes a self-diagnostic function built into the LAN system. The manual explains how to start the self-diagnosis without a scan tool – using the temperature setting trimmer and the foot position setting trimmer. It lists display item lists for the CONSULT-II data monitor, including intake door control, air mix door control, fan speed control, and magnet clutch control. If the A/C isn’t cooling, you don’t replace parts; you run the self-diagnosis first. The manual shows you the exact procedure and what each code means.

What Does the Operational Check Include?

The Operational Check section on page 26 (yes, same page as lubricant) covers: checking memory function, blower operation, discharge air direction, recirculation, temperature increase and decrease, A/C switch functionality, and AUTO.ECON mode. Each check has a pass/fail condition. For example, when checking temperature decrease, you set the temperature to 60°F and monitor the air mix door movement. The manual tells you the expected airflow pattern. If the door doesn’t respond, you go straight to the wiring diagram and terminal reference values for the Auto Amp. That’s how a pro diagnoses – by confirmation, not replacement.

Does this manual cover the engine or transmission?

No. This is the automatic air conditioner section only.

Can I use this for a 2003 G35 coupe?

The 2003 and 2004 G35 Coupe A/C systems are similar, but Nissan issued revisions for 2004 – particularly for refrigerant connections and SRS wiring. Using the 2004 manual ensures you have the latest one-touch joint specs and the correct lubricant adjustment procedure. Cross-reference your build date.

Why is SRS safety so important when working on the A/C?

The Supplemental Restraint System can deploy if you disturb wiring or connect power to the wrong circuit. The manual dedicates full pages to SRS precautions: disconnect the battery and wait three minutes before working near any air bag components. Even if you’re only replacing a blower motor, you need to locate the SRS harness. Page 5 lists the exact warning labels and handling steps. Ignoring this can cause injury and thousands in damage. That’s why the first chapter is Precautions – Nissan wants you to survive the job.

Can I access the full service manual?

This product is the A/C section. For the complete 2004 Infiniti G35 Coupe service manual, see related listings below.

Related manuals you might need: Infiniti G35 2003 Driver Information System Service Manual, 2004 Infiniti G35 Coupe Service Manual – SRS & Wiring | 60 Pages, 2003 Infiniti G35 Coupe Service Manual – Wiper & Washer Systems. For broader context on automotive diagnostics, check the Automotive Industry Overview or read up on Manual Transmission if that’s your next job. Access the Factory Manual and stop trusting third-party reprints.