A Sub-Zero that slowly loses cooling while running constantly often has a refrigerant leak. We locate leaks with electronic detectors, bubble solution and nitrogen pressure testing, repair or replace the leaking component, replace the filter-drier, evacuate the system and weigh in the exact factory charge.
Why "Just Adding Freon" Doesn't Work
Refrigerant isn't consumed. If the charge is low, it leaked out. Sub-Zero systems use a small, precisely measured charge, so adding refrigerant without fixing the leak gives you a few weeks of cooling before the problem returns. Overcharging or undercharging also stresses the compressor. The correct repair is leak search, repair, new filter-drier, evacuation and a weighed charge.
Where Sub-Zero Leaks Happen
- Evaporator punctures from chipping ice
- Corroded evaporator or condenser tubing
- Brazed joints that crack from vibration
- Service access points added during a previous repair
- Rubbed tubing in the mechanical compartment
Our Leak Detection Methods
- Visual inspection for oil residue at joints and tubing.
- Electronic leak detector sweep of accessible tubing and components.
- Bubble solution on suspect joints.
- Nitrogen pressure test: pressurize the system and monitor for pressure drop.
- Isolation of sections when needed to pinpoint a leak inside foam-insulated areas.
Leaks Inside the Foam
Some tubing runs inside the cabinet's foam insulation. When a leak is in an inaccessible section, the reliable repair is often to bypass that section with new tubing routed outside the foam. We'll explain the options before starting.
Typical Cost
| Repair | Typical range |
|---|---|
| Refrigerant leak repair, evacuation & recharge | $995 – $2,150 |
| Evaporator replacement | $1,595 – $2,850 |
| Condenser coil replacement | $1,395 – $2,450 |
Typical totals for parts and labor in the Las Vegas area. The $75 service call is credited toward your repair, and every repair is backed by a 1-year parts and 180-day labor warranty. Your exact price depends on the model, the part and access, and you approve a firm quote before any work begins. Full price list →
Need a Sub-Zero Specialist?
$75 service call, credited toward your repair · 1-year parts · 180-day labor warranty · EPA 608 certified · Mon–Fri 8am–7pm · Sat–Sun 8am–4pm