Description

Chrysler NS, GS Service Manual – Heating and Air Conditioning

If you’ve ever fought a Chrysler NS or GS HVAC system that blows warm on one side and cold on the other, you know the frustration of guessing which actuator failed, whether the evaporator probe is open or shorted, and what the flashing LED codes actually mean. Aftermarket wiring diagrams and generic YouTube videos won’t tell you the factory calibration procedure or the exact refrigerant oil capacity for the rear evaporator. That’s where this Chrysler NS, GS Service Manual comes in. It’s the 60-page OEM document Chrysler issued to dealers, covering only the front and rear heating and air conditioning systems. No transaxle, no engine – pure HVAC from page 1 to 60.

Actuator Calibration and Diagnostics: Factory Procedure

You’ve replaced a blend-air door actuator and the system still won’t calibrate? The manual walks you through the actuator calibration/diagnostics and cooldown test step by step, using only the HVAC control module push buttons and the windshield wiper/washer switch. It shows the exact flash patterns – for example, after calibration, Rear Wiper LED flashing once with Intermittent LED flashing twice means the mode actuator didn’t reach the panel position. Page 6 (ACTUATOR CALIBRATION/DIAGNOSTICS AND COOLDOWN TEST) covers the entry procedure, EEPROM data, and fail code levels. You won’t find this level of diagnostic detail in a Chilton’s or Haynes.

7 Failure Code Tables

The manual dedicates a full section to HVAC control diagnostic conditions, listing failure codes from Level 1 (Intermittent Wipe Button LED flashing) through Level 9. Each code is tied to a specific component: temperature potentiometer, mode actuator, evaporator probe open or shorted, driver/passenger temperature actuator not reaching stops. It even explains the POTENTIOMETER VS. POSITION AND FLASH RATE chart. If you’ve ever stared at a blinking LED without knowing what it means, this section alone saves you hours. Couple that with the Chrysler NS GS Wiring Diagram to trace the actual circuits back to the HVAC control module.

Refrigerant Oil Capacities and System Oil Level Check

Overcharging refrigerant oil kills compressor efficiency and can slug the **valve** plate on startup. Undercharging starves the bearings. The manual gives REFRIGERANT OIL CAPACITIES for the front and rear systems, plus the REFRIGERANT OIL LEVEL CHECK procedure. It tells you how to check oil level after component replacement – something aftermarket manuals often skip. The **Engine** cooling system requirements section also warns you that poor coolant flow through the heater core will cause insufficient heat, and it lists possible locations of obstructed coolant flow. That kind of real-world troubleshooting is why I keep OEM manuals on the lift.

Compressor High-Pressure Relief Valve and Safety Precautions

The SAFETY PRECAUTIONS AND WARNINGS are worth the price alone. It tells you – in plain red text – never to open the R-134a system while it’s under pressure, and how to properly relieve it using the COMPRESSOR HIGH-PRESSURE RELIEF **VALVE**. The manual also covers HANDLING TUBING AND FITTINGS to prevent oil contamination and leaks. If you’re swapping a compressor, the removal section on page 22 (COMPRESSOR) includes the sequence for discharging, removing the clutch/coil, and reinstalling with correct torque. I’ve seen too many backyard jobs where the high-side line gets cross-threaded because someone didn’t read the torque spec. OEM saves you that headache.

Is This Manual for DIYers or Pros?

If you’re a home garage enthusiast who can read a multimeter and turn a wrench, this manual is for you. It assumes you know basic safety but doesn’t assume you’ve ever calibrated an actuator. The blend-air door actuator removal (page 20) is a 20-minute job with the right tool list. The COOLDOWN TEST on page 6 takes 15 minutes and tells you exactly if the system is performing to factory spec. For professional mechanics, the diagnostic flowcharts and failure code tables cut diagnostic time in half. I’ve used this manual to fix a 2002 Chrysler Town & Country (NS body) with a stuck mode actuator – the calibration procedure fixed it in 10 minutes. For the GS model, the rear HVAC service ports and evaporator probe data apply directly.

OEM vs. Aftermarket: Why This Manual Wins

Aftermarket manuals often combine multiple years and platforms into one generic volume. They might say “typical” torque values or omit the EEPROM data reset procedure. This is the actual Chrysler service manual – the same one dealers used. It covers only NS and GS platforms, front and rear HVAC, with no transaxle or engine content to clutter the search. The page numbers match the factory binder, the illustrations are line drawings from Chrysler, and the specifications (like refrigerant R-134a charge level) are verified. You get the exact failure code sequences for the A/C PERFORMANCE TEST, SYSTEM CHARGE LEVEL TEST, and HEATER PERFORMANCE TEST. Related resources: Chrysler NS/GS Transaxle and Power Transfer Unit Service Manual – Section: Power handles the drivetrain, while Chrysler NS GS Tires & Wheels Service Manual covers the chassis. For transmission details, refer to the external Manual Transmission guide on Wikipedia.

FAQ

Does this manual cover the rear A/C system?

Yes. The manual includes REAR HEATING AND AIR CONDITIONING SYSTEM starting on page 41, with separate sections for rear blower speed switch, rear HVAC outlets, and refrigerant oil capacities for the rear system.

What about torque specs for the compressor mounting bolts?

The removal and installation section for the compressor (page 22) lists the torque values for mounting bolts and the clutch/coil retaining nut. I can’t recite them here – that’s what the manual is for. But they’re in foot-pounds, as Chrysler intended.

Access the Factory Manual from AutoRepairManuals and get the real data. No aftermarket guesswork, no condensed procedure – just the 60-page Chrysler NS GS service manual that tells you exactly how to fix the HVAC system, from actuator calibration to refrigerant charge. External reference on Manual Transmission basics if you’re working on the whole vehicle.