For campers seeking reliable climate control on the road, a used Coleman RV air conditioner can be a cost-effective option. This guide explains how to evaluate, choose, and maintain a used Coleman unit to ensure efficient cooling, proper fit, and safe operation in RV applications. It covers common models, inspection tips, sizing, and practical buying and installation considerations.
What Makes Coleman Mach RV Air Conditioners Stand Out
Coleman RV air conditioners, particularly the Mach series, are known for their robust cooling performance, relatively easy serviceability, and wide availability of replacement parts. Key strengths include:
- Durability: The units are designed for frequent travel and rough road conditions, with sturdy housings and reliable compressors.
- Serviceability: Spare parts, capacitors, fan motors, and other components are commonly stocked by retailers and service shops.
- Wide compatibility: Coleman Mach units come in several roof sizes and BTU ratings, making it easier to find a model that fits older or smaller RVs.
- Residential-grade cooling with RV conveniences: Features like thermostat control, electric reheat options, and quiet operation are standard in many models.
Key Models To Know
Understanding model variations helps in comparing used units. Some popular Coleman Mach models include:
- Mach 3 series: Lightweight, lower BTU options suitable for smaller rigs.
- Mach 6 series: Higher efficiency and mid-range cooling capacity, common in mid-sized RVs.
- Mach 8 and Mach 15 series: Higher BTU ratings for larger trailers or cabins, often used in warmer climates.
- Hot Water Running compatibility: Some units offer heat strips or optional heating functions for transitional seasons.
When shopping used, verify the model number, BTU rating, and roof footprint. This ensures proper fit with the RV’s roof cutout and wiring harnesses.
Buying Used: What To Inspect
A thorough inspection helps prevent post-purchase surprises. Consider these checks:
- Exterior condition: Inspect housing for dents, cracks, or corrosion. Check seals and mounting flange for wear that could cause leaks.
- Compressor and fans: Listen for odd noises during operation. Spin the blower and condenser fan by hand to check for smooth movement and wobble.
- Electrical components: Examine wiring for fraying, burnt smells, or melted insulation. Confirm control board and thermostat compatibility with your RV wiring.
- Sealed systems: For models with sealed refrigeration, verify there are no signs of refrigerant oil leakage or ice buildup around seals.
- Controls and thermostat: Ensure the remote or wall thermostat responds accurately and maintains set temperatures.
- Roof compatibility: Measure the unit’s width, height, and mounting profile to ensure a proper seal with your RV roof and existing vents or airways.
Ask for maintenance history and receipts. A unit with regular service, clean filters, and a recently charged refrigerant system is preferable to one with uncertain upkeep.
Sizing And Compatibility
Correct sizing is critical for efficiency and comfort. Key points include:
- BTU matching: Smaller RVs typically require 13,500 to 15,000 BTU, while larger rigs may need 18,000 BTU or more. Oversized units can short-cycle, wasting energy and reducing humidity control.
- Roof space: The Coleman Mach headroom must fit the roof cutout. Verify the unit’s dimensions and the RV’s roof thickness before purchase.
- Power availability: Check electrical supply, including AC voltage, amperage, and the availability of a dedicated circuit on the RV’s panel.
- Ventilation provisions: Ensure the unit’s air distribution aligns with existing ducting, ceiling vents, and interior layout for even cooling.
Consult the unit’s manual or a technician to confirm compatibility with your RV’s electrical system and existing AC ductwork. Incorrect sizing can lead to inefficient cooling and higher energy use.
Testing And Installation Tips
When possible, test a used Coleman unit before finalizing the purchase. Practical steps include:
- Run test: Power on the unit and observe for proper start-up, cooling performance, and thermostat response.
- Leak check: Use soapy water on connections to detect refrigerant leaks. A steady bubble indicates a leak that may require professional repair.
- Electrical safety: Use a grounded outlet and verify that all wiring is correctly connected according to the RV’s electrical codes.
- Seal the roof: After installation, apply high-quality RV-specific sealant around mounting flanges to prevent leaks during travel and rain.
- Professional install: If the unit requires significant roof cutting, wiring changes, or refrigerant handling, hire a certified RV technician.
Some sellers offer partial installation or professional installation add-ons. Factor these costs into the total purchase price.
Care And Maintenance
Regular upkeep extends the life of a used Coleman RV air conditioner. Recommended practices include:
- Clean filters: Replace or clean cabin air filters every 1–3 months of use, depending on environment and usage.
- Clear condensate drains: Keep drain lines free of obstructions to prevent water backing up into the unit.
- Exterior cleaning: Wipe down the exterior housing and check seals for cracks or gaps twice a year.
- Brush and vacuum: Periodically clean the condenser coils and fan housings to maintain efficient heat exchange.
- Seasonal checks: Before peak season, inspect electrical connections and test the thermostat, fan speeds, and defrost controls.
Store spare fuses, thermostat batteries, and a small repair kit for on-the-road contingencies. Documentation of maintenance helps preserve resale value.
Cost And Where To Buy
Used Coleman RV air conditioners vary in price based on model, BTU, condition, and included components. Typical ranges:
- Mid-range models (Mach 6–Mach 8, 15,000–18,000 BTU): $200–$600 depending on age and condition.
- Higher BTU or premium features: $400–$900.
- Parts and accessories: Separate costs for ceiling brackets, mounting kits, sealed systems, and replacement condensers.
Trusted sources include RV liquidators, online marketplaces with seller ratings, and RV service shops that sell refurbished units. When possible, request a demonstration or a documented condition report. Some models may require shipping or local pickup due to size and weight.
Safety And Environmental Considerations
Using a used Coleman RV air conditioner responsibly involves attention to safety and environmental practices. Important points:
- Gas and refrigerant handling: Do not disturb sealed refrigerant systems if not trained. Leaks can be hazardous and require licensed technicians for repair.
- Electrical safety: Ensure proper grounding and correct voltage supply. Avoid overloading circuits or using adapters not rated for RV use.
- Fire risk prevention: Keep the area around the unit clear of flammable materials and ensure adequate ventilation for compressor operation.
- Warranty considerations: Used units rarely carry full warranties, but some sellers offer limited guarantees or return policies. Read terms carefully.
For buyers, a price-appropriate, well-maintained Coleman Mach unit can be a solid investment for dependable RV cooling. Thorough inspection, correct sizing, and careful installation are essential to maximize performance and safety.