Coolant Flush –Colchin Auto Serves Arvada, Denver & Wheat Ridge

Regular Service Saves Money

The Bottom Line: If you flush the coolant every 3 years or less, you can reduce your overall operating expenses for the life of the car or truck. Regular maintenance means added value when you’re ready to trade or sell, as well as enhancing safety and reliability.

Why Regular Coolant Flush Intervals are Important

All automotive antifreeze types experience chemical transformations when exposed to heat and air. Over time, the antifreeze solution turns to acid – acid is corrosive to metals and plastics commonly used in automotive cooling systems. The acid literally etches away at components in your cooling system.

CORROSION: This is why we recommend cooling system flushing every 3 years – regardless of how many miles you put on your vehicle in any 3 year period.

The two pictures below graphically demonstrate the difference between Cooling System neglect and reasonable Coolant Flush service intervals.

Impeller is corroded away

Impeller is corroded away



SLIME: Besides cooling system corrosion, Biological Fouling (Biofouling) occurs – commonly known as “Slime. Microorganisms and algae accumulate on wet surfaces. Slime causes over-heating problems primarily, but once this biological process starts, the corrosion rate in the cooling system accelerates.

This is a Chevrolet S-10 radiator with extreme levels of “slime” deposited from biofouling and corrosion. Once a cooling system reaches this level of neglect it’s very difficult and expensive to restore it to good condition.

Types of Engine Coolants

Extended life engine coolant works really well in the laboratory (so does conventional coolant) but not as consistently out on the road under a variety of conditions.

Ethylene Glycol Antifreeze – known as “Conventional Coolant” (Typically Green in Color) This is the oldest of the automotive antifreezes still in use today… It’s been around since 1926. Ethylene Glycol has a sweet taste and is toxic to humans and animals if ingested. Conventional coolants are no longer used as factory-fill in automobile and light truck applications.

Propylene Glycol Antifreeze Propylene Glycol is essentially non-toxic to living organisms when ingested and is widely used today as an automotive coolant.

Organic Acid Technology (OAT) or Hybrid Organic Acid Technology (HOAT) “OAT” describes the type of materials used in this type of coolant and provides superior protection to all components of the cooling system including aluminum and magnesium found in today’s engines. In general, OAT-based corrosion inhibitors are recognized for their non-toxic properties, making them readily biodegradable, addressing any environmental and occupational health & safety issues.

Global Extended Life Coolant (GELC) This extended life OAT-based engine coolant was designed for use in all makes and models of foreign and domestic cars and light duty trucks. It contains a proprietary blend of premium corrosion inhibitors that provide extended protection against rust, corrosion and pitting caused by cavitation for all cooling system metals.

Colchin Automotive has converted to Global Extended Life Coolant for use in most every vehicle we service for the following reasons:

  1. Environmentally safe when coolant is lost from vehicles.
  2. “Topping Up” If you need to add coolant to your vehicle, you can use Organic Acid Technology (OAT) coolant.
  3. GELC or OAT coolants are essentially non-toxic.

Schedule your Coolant Flush maintenance with Colchin. We only use environmentally safe coolant and are your local auto repair partners in Arvada, Wheat Ridge and Denver. Call us at 303-431-5421 for more information or click here to make an appointment.


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