The evaporator is the coil inside the cabinet, behind the rear panel, that absorbs heat. Sub-Zero evaporators can develop refrigerant leaks from corrosion or physical damage, often caused by chipping ice with a sharp object. A leaking evaporator is replaced, followed by a new filter-drier, pressure test, evacuation and weighed refrigerant charge.
How Evaporators Fail
- Punctures from sharp tools used to chip away ice during a manual defrost. This is the #1 avoidable sealed system failure.
- Corrosion over many years, especially where meltwater sits on aluminum tubing.
- Vibration fatigue at tubing joints.
Never use a knife, ice pick or screwdriver to remove ice from a Sub-Zero. Unplug the unit and let ice melt naturally, or call us. One slip can turn a simple defrost repair into an evaporator replacement.
Symptoms of a Leaking Evaporator
- Gradual loss of cooling over days or weeks
- Partial frost pattern: only the first part of the coil frosts
- Unit runs constantly
- Sometimes an oily residue near a joint or puncture
Dual Evaporator Systems
Most full-size Sub-Zero units have separate fresh food and freezer evaporators. A leak in one still drains the entire system charge, so both sections eventually warm. We locate the leak precisely before replacing anything. See leak repair.
Replacement Process
- Leak search confirms the evaporator is the source.
- Recover refrigerant.
- Remove interior panels and the old evaporator.
- Install the new evaporator, braze connections under nitrogen.
- Replace the filter-drier, pressure test, evacuate, weigh in the charge.
- Reinstall panels, insulation and the defrost heater; run test.
Typical Cost
| Repair | Typical range |
|---|---|
| Evaporator replacement | $1,595 – $2,850 |
| Defrost heater / defrost sensor repair | $395 – $745 |
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