2018 Hyundai Ioniq Plug-In Hybrid Coolant in Peoria, AZ

Warning lights, rising temperature readings, low coolant level, sweet odors, or visible leaks indicate it’s time to inspect and likely service the cooling system.

On the 2018 Hyundai Ioniq Plug-In Hybrid, you might also notice poor cabin heat, dried residue near hose joints, or the cooling fan running more than usual. Because coolant additives deplete over time, testing during a visit confirms condition even when no symptoms show. Always check levels only when the engine is cold; the system is hot and under pressure after running.

• Temperature warning or fluctuating gauge
• Coolant level drops or visible leaks/residue
• Heater performance fades or sweet smell under hood

The service drains and refills coolant to spec, bleeds air, pressure-tests the system, and inspects hoses, clamps, cap, radiator, water pump area, thermostat housing, and fans.

Technicians also look for seepage and deposits that hint at early corrosion or gasket wear. Using the manufacturer-specified coolant helps restore corrosion protection and stable operating temperature. A road test and leak recheck confirm proper function under load. This approach addresses both fluid condition and component health in one visit.

• Drain/refill with manufacturer-specified coolant
• System pressure test and cap inspection
• Checks of hoses, radiator, pump area, thermostat, and fans

The manufacturer publishes the maintenance schedule for this vehicle, and that schedule—supplemented by coolant condition testing at service visits—determines when to change it.

Intervals depend on time and operating conditions, not just mileage or appearance. In hot Phoenix-area driving, testing during routine maintenance helps confirm protection between scheduled changes. If test results show depleted inhibitors or contamination, service sooner regardless of how the coolant looks.

• Follow the official maintenance schedule for your vehicle
• Confirm condition via coolant test at service visits
• Service earlier if testing shows depleted protection

Hyundai specifies a particular coolant for this vehicle, and coolants are not interchangeable; bottle color is not a reliable guide to what’s correct.

Using the wrong chemistry can reduce corrosion protection and affect seals. During service at Larry H. Miller Hyundai Peoria, we install the correct, manufacturer-specified coolant and verify concentration with a tester. This protects aluminum passages, the water pump, and heater core from premature wear.

• Use only the manufacturer-specified coolant
• Do not choose by color; it is not a spec
• Have concentration verified during service

Adding coolant restores level but does not refresh depleted corrosion inhibitors, and a level that keeps dropping indicates a leak that needs inspection.

Check levels only when the engine is cold; the system is hot and under pressure after running. If the reservoir is low, topping off can get you to a service appointment where the system can be tested, bled if necessary, and checked for leaks. Ongoing loss should be diagnosed rather than repeatedly topped up.

• Top off cold only, never open a hot system
• Book an inspection if the level falls again
• Service restores inhibitors; topping off does not

You can schedule appointment online, call {{rooftop.phone}}, or visit our Peoria Service Center to get started.

Online booking lets you choose a time, note concerns, and review available service specials. Our team will confirm details and ensure your 2018 Hyundai Ioniq Plug-In Hybrid receives the manufacturer-specified coolant and testing it needs. If you prefer in-person help, stop by our location in Peoria for assistance.

• Use our online scheduler any time
• Call for availability and guidance
• Reference your 2018 Hyundai Ioniq Plug-In Hybrid at check-in