Recover and identify
We confirm the refrigerant type and recover refrigerant when required before opening the APU recharge process.
Recharge by diagnosis, vacuum, and measured weight
APU Recharge Service
A proper APU recharge is not a quick top-off. We recover refrigerant when required, vacuum test for moisture and leaks, recharge by weight, and verify temperature split under real sleeper conditions.
- Refrigerants
- R-134a, R-404A, custom applications
- Brands
- Thermo King, Carrier, RigMaster, Dynasys
- Service
- Recharge, repair, leak checks, diagnostics
Recharge service
APU recharge
APU Recharge helps drivers get cooling back without guessing. If the system is simply low, we recharge it correctly. If the charge leaked out because of a damaged hose, condenser, service valve, or fitting, we help find that before the same problem returns.
Leak and vacuum check
Vacuum testing helps remove air and moisture while exposing leaks that would waste the new charge.
Recharge by target
Service can include R-134a, R-404A, and custom refrigerant applications. The tech charges according to the equipment data and verified operating behavior.
Verify cold air
Final checks include vent temperature, compressor cycling, fan operation, pressure behavior, and customer notes.
Better method
Why not just top it off?
A quick top-off may get cold air for a moment, but it can miss the leak, overcharge the system, or leave moisture inside. A professional recharge protects the compressor and gives dispatch better repair data.
- Check for oil and dye clues Oily fittings, service ports, condenser rub points, or repaired hoses can reveal where the charge escaped.
- Watch high-side behavior High pressure can point toward condenser airflow, overcharge, restriction, or fan operation problems.
- Watch low-side behavior Low suction can point toward charge level, restriction, metering, evaporator airflow, or freeze conditions.
- Document next steps If a leak or failed part is found, the driver gets a practical repair path instead of another short-lived recharge.
FAQ
Questions drivers ask before dispatch
Straight answers help avoid the wrong truck, wrong refrigerant, or wrong tool showing up.
How do you know how much refrigerant to add?
We use the unit data plate, manufacturer information when available, and operating readings. The goal is charge accuracy, not pressure-only guessing.
Can you recharge an APU that is completely empty?
Often yes, but a flat system should be leak checked before charging. Moisture and air inside the circuit can damage performance.
Do you handle custom applications?
Yes. Dispatch should know the refrigerant type, unit brand, and any custom sleeper, reefer, or auxiliary cooling details before sending a tech.