2025-01-15 · 5 min read
Mazda CX-90 Radiator Malaysia — PHEV Cooling
CX-90 PHEV has multiple cooling loops: ICE radiator, HV battery cooler, and electric motor/inverter cooler — all requiring different fluids and separate service. ICE radiator: FL22 coolant, first change at 5 years. HV components cooling: dealer only, special procedures. Malaysia heat: inline-6 turbo generates significant heat — larger cooling capacity than CX-5. Ensure radiator fins are clean (debris from heavy Malaysia rainfall can clog finning).
The radiator keeps your engine coolant at the right temperature by dissipating heat through its fins. In Malaysia's tropical climate — with heavy traffic, high ambient temperatures, and frequent short trips — radiators work harder than almost anywhere else in the world.
Signs your radiator needs attention
- Temperature gauge climbing above normal, especially in slow traffic
- Visible coolant puddle under the car (usually sweet-smelling, green or orange)
- White milky oil — sign coolant is mixing with engine oil (head gasket or cracked block)
- Rust or brown discolouration in the coolant reservoir
Radiator flush vs replacement
A coolant flush every 2 years (or 40,000 km) removes old degraded coolant and inhibitors. This prevents internal corrosion and blockages. Cost: RM 80–150 including new coolant.
If the radiator itself is leaking or severely clogged, replacement is needed. Budget RM 400–900 for most Japanese and national cars; RM 900–2,000 for European models. OEM or Denso/Modine quality radiators are strongly recommended over cheap alternatives.