Frigidaire KRSC536RPS side-by-side not cooling: fridge 8–10°C, weak airflow

Question

Frigidaire side-by-side fridge, model KRSC536RPS, isn’t getting cold enough even on the coldest settings.

AskHow · Accepted Answer

Customer: Frigidaire side-by-side fridge, model KRSC536RPS, isn’t getting cold enough even on the coldest settings.

Appliance Expert: Hi, I’m Mike, your appliance troubleshooting expert—about what temperatures (°C) are you seeing in the fridge and freezer, and is the freezer still keeping ice solid?

Customer: The fridge is around 8–10°C and the freezer is about −8°C on a cheap thermometer; ice cream is soft and ice cubes clump together, both sides are set to the coldest, and the door seals look okay though the kids do open it a lot.

Appliance Expert: When you open the freezer, do you hear the internal fan running steadily and does airflow from the fridge side vents feel weak?

Customer: Yeah, I can hear a fan in the freezer, though it kind of ramps up and down, and the airflow from the fridge vents feels pretty weak even on max cold.

Appliance Expert: Do you see a uniform thick frost blanket on the freezer’s back interior panel, or just patches/stripes or little to no frost?

Customer: It’s more like patches or stripes, with a bit of ice near the top corner, not a solid frost blanket.

Appliance Expert: Is the space behind and above the fridge tight, and have the condenser coils and rear fan (behind or underneath) been cleaned recently?

Customer: It’s in a snug alcove—maybe 2 cm clearance at the top and a couple cm at the back—and I’ve never cleaned the coils;

Appliance Expert: Thanks, that helps; with fridge 8–10°C and freezer −8°C, both sections are too warm, which points to an overall heat-removal problem rather than just a thermostat setting. Most likely causes are:
- Poor cabinet ventilation/clearance: side‑by‑sides typically need roughly 5 cm at the back and 5–10 cm up top to exhaust heat; 2 cm is often insufficient, causing high condenser temps and weak cooling.
- Dirty condenser coils: dust-matted coils greatly reduce heat rejection even if the condenser fan spins.
- Evaporator icing/airflow restriction: patchy frost and weak fridge airflow can come from a defrost system issue (heater/defrost sensor/control) or past door-ajar events leading to ice that partially blocks the evaporator.
- Weak evaporator fan or stuck air damper: the fan moves cold air off the freezer coil; the damper meters it to the fridge—if either is underperforming, fridge temps climb.
- Temperature sensor/control fault: bad thermistors or control logic can misread temps and short-cycle cooling.
- Sealed-system/compressor problem: low refrigerant, a restriction, or a weak compressor can leave the freezer only mildly cold and the fridge warm; this requires a licensed refrigeration technician.
Safety note: avoid contact with moving fans and hot compressor surfaces. If you’d like, I can walk you through a safe, step-by-step checklist to narrow it down and separate airflow/maintenance issues from a sealed-system fault—want to do that?

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