Pop the hood of almost any car and you’ll see a bright fluid in the overflow reservoir — green, orange, pink, or even blue. That’s antifreeze, also called coolant, and while it may look simple, it plays a critical role in keeping your engine alive.

Here in Alaska, where engines face extreme freezing temperatures in winter and overheating risks in the summer, choosing the correct antifreeze isn’t optional — it’s essential.

Let’s break down what the colors mean, the differences between antifreeze types, and how to know when it’s time for a coolant flush.

What Does Antifreeze Do?

Antifreeze is a fluid mixed with water that circulates through your vehicle’s radiator and engine block. It helps:

• Prevent overheating in hot weather
• Protect against freezing in cold climates
• Inhibit corrosion and rust in the cooling system
• Lubricate the water pump and internal seals

Without proper antifreeze levels or the correct type, your engine is at risk of cracked blocks, blown head gaskets, or a failed radiator — all of which can leave you stranded in the worst conditions.

Why Antifreeze Comes in Different Colors

Coolant color isn’t just cosmetic — it’s an easy way to identify the chemical base and the additive package in each type. Here’s a basic overview:

Green Coolant

• Type: Inorganic Acid Technology (IAT)
• Use: Older vehicles (typically pre-2000)
• Change Interval: Every 2 years or 30,000 miles
• Notes: Contains silicates and phosphates; not compatible with newer systems

Orange Coolant

• Type: Organic Acid Technology (OAT)
• Use: GM Dex-Cool and similar modern engines
• Change Interval: Up to 5 years or 150,000 miles
• Notes: Long-lasting but not backward compatible with IAT systems

Pink / Red Coolant

• Type: Hybrid Organic Acid Technology (HOAT)
• Use: Chrysler, European brands, and some Fords
• Change Interval: 5 years or 100,000 miles
• Notes: Offers corrosion resistance and compatibility with aluminum parts

Blue Coolant

• Type: HOAT or specific manufacturer blends
• Use: Honda, Subaru, Nissan, Hyundai
• Change Interval: Varies by brand
• Notes: Often formulated to match Asian vehicle chemistry

While the color gives you a visual cue, it’s not always a guarantee of compatibility. Always check your owner’s manual or consult your trusted auto repair shop before topping off or replacing coolant.

Why Using the Wrong Antifreeze Is a Problem

Mixing different types of coolant can cause:

• Chemical reactions that thicken the fluid or turn it into sludge
• Reduced corrosion resistance
• Accelerated wear of internal components
• Radiator blockage or water pump damage

In Alaska’s extreme conditions, these issues can snowball fast — from a simple coolant leak to an engine that won’t start in subzero temperatures.

That’s why at Frontier Auto and RV Center, we always match the exact manufacturer-recommended coolant when performing a coolant flush or service.

How to Know When You Need a Coolant Flush

Even the right coolant breaks down over time, losing its ability to protect your engine. Here are signs it might be time for a coolant flush:

• Engine running hotter than usual
• Visible rust or discoloration in coolant
• Heater not working properly
• Sweet smell or coolant puddle under vehicle
• Check engine light or temperature warning

Regular coolant testing and flushes remove debris, restore the fluid’s chemical balance, and help your radiator and water pump last longer.

We recommend a coolant flush every:

• 2 years for older IAT systems
• 5 years for modern OAT/HOAT systems
• Immediately if the coolant appears contaminated

Antifreeze for RVs and Towing Vehicles in Alaska

If you drive or tow an RV, trailer, or heavy-duty truck, you put extra strain on your cooling system — especially on long highway pulls or while hauling uphill.

You should:

• Use high-performance coolant with anti-boil properties
• Install a coolant temperature gauge if towing often
• Inspect the radiator, hoses, and overflow tank more frequently
• Ensure your RV generator or motorized unit uses the correct coolant blend

At Frontier Auto and RV Center, we service both light-duty and heavy-duty cooling systems to handle the demands of Alaskan roads.

Let Frontier Auto and RV Center Handle Your Cooling System

Whether you’re driving a daily commuter, towing your boat, or exploring the wilderness in a motorhome, we’re here to make sure your cooling system is up to the task.

Our services include:

• Manufacturer-specific coolant flushes
• Radiator testing and repair
• Thermostat replacement
• System pressure checks
• Antifreeze compatibility matching

We carry all major antifreeze types and offer personalized recommendations based on your vehicle, driving habits, and seasonal needs.

Stay Cool (and Warm) Year-Round

Your engine’s cooling system is just as important in the winter as it is in the summer. Don’t wait until the overheating light flashes or your engine freezes overnight.

Schedule a coolant inspection or antifreeze flush today with Frontier Auto and RV Center — your trusted partner in Anchorage and across Alaska for all things automotive and RV.