A/C Compressor Guide for the 1975-1980 Dodge Colt
If your Colt's A/C is struggling, the compressor is often the first place to look.
- The 1975-1980 Dodge Colt was built by Mitsubishi; this can be helpful when searching for parts.
- Your original A/C system used R-12 refrigerant, which is obsolete. You must convert the system to R-134a when installing a new compressor.
- Always replace the receiver-drier and expansion valve when replacing the compressor to prevent contamination and ensure longevity.
- Aftermarket is the only option for a new compressor. Four Seasons is a common brand, but proper installation is key to its reliability.
Is Your Colt's A/C Blowing Warm?
For a classic car like the 1975-1980 Dodge Colt, a working air conditioning system is a real luxury. When it stops blowing cold, the problem can often be traced back to the A/C compressor. This part works hard and is exposed to heat and vibration, so it's a common failure point. Understanding the signs of a failing compressor can help you decide when it's time for a replacement.
A Note on Refrigerant
Your 1975-1980 Dodge Colt was originally equipped with an R-12 refrigerant system. R-12 is no longer available for public use. When replacing your A/C compressor, it is highly recommended to convert the entire system to the modern R-134a standard. This involves flushing the system, replacing the receiver/drier, and using compatible oils and O-rings. A new aftermarket compressor will be compatible with R-134a.
Symptoms of a Failing A/C Compressor
- No Cold Air: The most obvious symptom. If the compressor isn't pressurizing the refrigerant, the system cannot cool the air.
- Strange Noises: Grinding, squealing, or clicking sounds when you turn on the A/C point to internal compressor problems or a failing clutch. These noises mean you should stop using the A/C immediately to prevent further damage.
- Leaking Fluid: The compressor uses a special oil mixed with the refrigerant. If you see oily residue on the compressor body or nearby fittings, it's a sign of a leak.
- Stuck or Seized Clutch: The front part of the compressor has a clutch that engages when you turn on the A/C. If this clutch won't spin, is locked up, or doesn't engage at all, the compressor won't run.
Choosing Your Aftermarket Replacement
For a vehicle from the 1970s, finding a new Original Equipment Manufacturer (OEM) A/C compressor is nearly impossible. The aftermarket is your only realistic source for a new part. The good news is that aftermarket brands often fix original design flaws.
Four Seasons is a well-known brand in the aftermarket A/C world and one of the primary options for your Colt. They are the largest remanufacturer of compressors and also produce new units. Customer reviews are mixed, which is common for aftermarket parts. Some users report parts failing early, while others have had them last for years with no issues. Success often depends on proper installation, which includes flushing the system, replacing the receiver/drier, and adding the correct amount of the right type of oil.
Pro Tip: Replace as a Kit
When you replace the compressor, you should also replace the A/C receiver-drier (or accumulator) and the expansion valve. Debris from the old, failed compressor can contaminate the new one and cause it to fail quickly. Buying a kit that includes these parts is a smart move.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket A/C Compressor | $265 - $398 |
| Shop Labor for Installation | $133 - $196 |
| System Evacuation & Recharge | $100 - $200 |
Frequently Asked Questions for Colt Owners
Do I have to replace the whole compressor if just the clutch is bad?
Sometimes the clutch can be replaced separately. However, for an older vehicle like the Colt, finding a clutch kit can be as difficult as finding a compressor. Also, a failing clutch can sometimes be a symptom of a failing compressor (which puts extra strain on the clutch). Given the age and the importance of a clean system, replacing the entire compressor assembly is usually the most reliable repair.
What is a "captive import" and why does it matter for my Colt?
Your 1975-1980 Dodge Colt is a "captive import," which means it was built by Mitsubishi in Japan and sold under the Dodge name. Specifically, it's a rebadged Mitsubishi Lancer or Galant. This is important because some mechanical parts, including A/C components, might be cross-compatible with their Mitsubishi counterparts, which can sometimes open up more parts-sourcing options.
Can I replace the A/C compressor myself?
Replacing the compressor is a mechanically straightforward job for a DIYer with the right tools. However, handling refrigerant requires special equipment. The system must be legally and safely discharged before you start and then properly evacuated (to remove moisture) and recharged with the correct amount of refrigerant and oil after the new part is installed. Most DIYers will have a shop perform the discharge and recharge parts of the job.
Were there any recalls for the A/C on my 1975-1980 Dodge Colt?
Searches of the National Highway Traffic Safety Administration (NHTSA) database did not show any specific recalls for the A/C compressor or A/C system on the 1975-1980 Dodge Colt. Recalls were found for later model year Colts concerning other issues.
Technical Specifications
Original system used R-12 refrigerant. Replacement compressors are compatible with R-134a refrigerant when the system is properly converted. Always verify the specific compressor model and clutch configuration for your vehicle's engine size.
We Have This Part in Stock
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.