1989-1992 Daihatsu Charade AC Compressor: Diagnosis, Replacement, and Buying Used
A complete guide to understanding, troubleshooting, and replacing the AC compressor in your G100-series Daihatsu Charade.
- A non-engaging clutch is most often caused by low refrigerant, not necessarily a bad compressor.
- When replacing the compressor, you MUST also replace the receiver/drier and expansion valve.
- The original system used R-12 refrigerant, but most replacements use R-134a and require PAG 46 oil. Verify your system's refrigerant type.
- Replacement requires specialized equipment for refrigerant recovery and recharge, making it a job for a professional shop.
Symptoms of a Failing AC Compressor
When an AC compressor starts to fail, it usually provides several warning signs. Ignoring them can lead to more expensive repairs as a failing compressor can send metal debris throughout the entire AC system.
- No Cold Air: The most obvious symptom is air from the vents that isn't cold. If the compressor can't build pressure, the refrigerant won't cool down.
- Loud Noises: A grinding or rattling sound when you turn the AC on points to failing internal components. A loud squeal can indicate a worn bearing or a slipping clutch.
- AC Clutch Doesn't Engage: The pulley on the front of the compressor should always spin with the engine belt. However, the center plate (the clutch) only engages when the AC is on. If it doesn't click and start spinning with the pulley, there's a problem. This can be caused by the compressor itself, but is often due to low refrigerant or an electrical issue.
- Visible Leaks: The compressor contains both refrigerant and special oil. You might see a greasy, grimy buildup on the compressor body, which is a sign of a slow leak from one of its seals.
Diagnosing the Problem
Before condemning the compressor, a few checks can help pinpoint the real issue.
- Visual Inspection: With the engine off, look at the compressor. Is the belt tight? Are there any obvious cracks in the compressor body or damaged wires?
- Check the Clutch: Start the engine and turn the AC on to its coldest setting. Watch the front of the compressor. You should hear a distinct 'click' as the clutch engages, and the center plate should start spinning with the outer pulley.
- If the Clutch Doesn't Engage: This is the most common failure scenario. It does NOT automatically mean the compressor is bad. The system has a low-pressure safety switch that prevents the clutch from engaging if the refrigerant level is too low, protecting the compressor from damage. Other causes include a blown fuse, a bad relay, or a faulty clutch coil.
Pro Tip: With the engine off, try to turn the center plate of the clutch by hand. It should turn smoothly with some resistance. If it's seized solid or feels gritty and rough, the compressor has failed internally.
Warning: The original 1989-1992 Daihatsu Charade AC system was designed for R-12 refrigerant. Many of these vehicles have since been converted to the newer R-134a standard. The type of refrigerant affects the type of oil used in the system. Using the wrong oil can destroy a new compressor. Always verify which refrigerant your system uses before adding oil or buying parts. Aftermarket compressors are typically designed for R-134a and use PAG 46 oil.
Buying a Used AC Compressor for Your Charade
Given the age of the Charade, new OEM compressors are often unavailable or prohibitively expensive. A quality used OEM Denso compressor can be a reliable and cost-effective solution. Here’s what to look for.
- Verify Part Numbers: Match the part number on your old compressor to the replacement. The original Denso numbers (like 447200-6180 or 447200-6750) are the most reliable way to ensure a perfect fit.
- Inspect the Ports: The inlet and outlet ports where the AC lines connect should be capped or sealed. If they are open to the air, moisture and dirt have contaminated the inside of the compressor, and you should not buy it.
- Turn the Clutch Hub: As mentioned in the diagnosis tip, turn the inner hub by hand. It must be smooth. Any grinding or seizing means the compressor is junk.
- Check the Pulley Bearing: Hold the compressor body and spin the outer pulley. It should spin freely and silently. Any wobble or noise indicates a bad pulley bearing.
- Examine the Electrical Connector: Make sure the plastic connector isn't cracked or broken and that the pins inside are not corroded or bent.
Replacement Overview & Difficulty
Replacing the AC compressor is a complex job that requires special equipment, making it difficult for most DIY mechanics.
- Difficulty: 4 out of 5
- Key Steps:
- Refrigerant Evacuation: The old refrigerant must be recovered by a professional with an EPA-certified machine. It is illegal and harmful to the environment to release it into the atmosphere.
- Component Removal: The drive belt, electrical connector, and AC lines are disconnected before unbolting the old compressor.
- System Cleaning: If the old compressor failed internally, the entire system must be flushed to remove metal debris. The condenser is very difficult to flush effectively and should be replaced if contamination is suspected.
- Replace Related Parts: It is mandatory to install a new receiver/drier (also called an accumulator) and expansion valve whenever the compressor is replaced. Failure to do so will void the warranty on most replacement compressors and can cause the new unit to fail quickly.
- Installation and Recharge: The new compressor is installed, and the correct amount and type of PAG oil is added. The system is then put under a deep vacuum to remove all air and moisture before being recharged with the precise weight of refrigerant specified for the vehicle.
Known Issues, TSBs, and Recalls
The 1989-1992 Daihatsu Charade is a relatively rare vehicle in the North American market. Searches of the National Highway Traffic Safety Administration (NHTSA) database show no specific recalls or widespread technical service bulletins (TSBs) related to the AC compressor for this model range. Failures are typically due to age-related wear on the clutch, seals, or internal components, which is common for any vehicle of this vintage.
Cost Comparison
Prices can vary based on location and supplier, but this provides a general estimate.
| Part Type | Estimated Cost |
|---|---|
| New OEM | $500+ (if available) |
| New Aftermarket | $250 - $400 |
| Remanufactured | $180 - $280 |
| Used OEM | $75 - $150 |
| Shop Labor (incl. evac/recharge) | $400 - $700 |
Frequently Asked Questions (FAQ)
Do I have to replace other parts with the compressor?
Yes. You must replace the receiver/drier (or accumulator) and the expansion valve. The receiver/drier contains a desiccant that absorbs moisture, and it can only hold so much. Opening the system to replace the compressor saturates it. Skipping this step is the #1 cause of premature failure for a new compressor.
Can I just replace the AC clutch?
Sometimes. If only the clutch coil has failed electrically or the pulley bearing is noisy, you can often replace just the clutch assembly. However, if the clutch failed because the compressor itself is beginning to seize, a new clutch will quickly be destroyed. Often, replacing the entire compressor assembly is more cost-effective and reliable.
What kind of oil does the 1989-1992 Charade AC compressor use?
It depends on the refrigerant. If your system is still original and uses R-12, it requires mineral oil. If it has been converted to R-134a (which is very likely), it requires PAG 46 oil. Most remanufactured and new aftermarket compressors come pre-filled with PAG oil for R-134a systems.
Why did my AC stop working right after a recharge?
If the system had a leak, recharging it is only a temporary fix. The most common reason for a clutch to stop engaging is low refrigerant pressure. If the system works for a short time after a recharge and then stops, you have a leak that needs to be found and repaired before the system is refilled again.
Technical Specifications
OEM Part Numbers: 88310-87721-000 88310-87722-000 88310-87724-000 8831087721000 8831087722000
Compressor Manufacturer: Denso. Common Cross-Reference: Four Seasons 57103, GPD 6511411, RYC AD-3533. Refrigerant Type: Originally R-12, most replacements use R-134a. Oil Type: PAG 46 for R-134a systems. Clutch: Single groove V-belt pulley.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Daihatsu Charade: