ACDelco 10-101 DEX-Cool is a long-life engine coolant made for General Motors vehicles

ACDelco 10-101 DEX-Cool is a specific type of engine coolant formulated by General Motors' parts division. It is an orange-colored, silicate-free coolant designed to last longer in your engine than traditional green coolants — typically up to 100,000 miles or five years, whichever comes first. If you own a GM vehicle (Chevrolet, GMC, Cadillac, Buick, or Pontiac), your owner's manual likely specifies DEX-Cool by name.

The "10-101" designation refers to the product code ACDelco uses to identify this particular formulation. When you see it listed at an auto parts store, you are looking at the same coolant that came from the factory in your vehicle. Using the correct coolant matters because mixing different types can reduce cooling performance and potentially damage your engine over time.

Key Takeaways

  • DEX-Cool is orange-colored coolant made specifically for General Motors vehicles and lasts longer than traditional green coolant.
  • Your vehicle's owner's manual will tell you whether your car requires DEX-Cool or a different coolant type.
  • You can purchase ACDelco 10-101 at most auto parts retailers, including Advance Auto Parts, in concentrated or pre-diluted form.
  • Mixing DEX-Cool with other coolant types can reduce its effectiveness and should be avoided except in true emergencies.
  • Checking your coolant level regularly and replacing it on schedule helps prevent overheating and engine damage.

How to know if your vehicle uses DEX-Cool

The easiest way to find out is to open your owner's manual and search for "coolant" or "antifreeze." The manual will specify the exact type your vehicle needs. If you do not have the manual, you can look it up online using your vehicle's year, make, and model — most manufacturers post manuals on their websites for free.

You can also look at the coolant already in your radiator. Open the radiator cap when the engine is cold (never when hot, as the coolant is pressurized and can burn you). If the liquid is orange, you almost certainly have DEX-Cool. If it is green, you have traditional coolant and should not mix in DEX-Cool without draining the old coolant first.

Where to buy ACDelco 10-101 and what form it comes in

Advance Auto Parts carries ACDelco 10-101 in both concentrated and pre-diluted forms. Concentrated coolant is cheaper per ounce but requires you to mix it with distilled water before pouring it into your radiator — the typical ratio is 50 percent coolant and 50 percent water. Pre-diluted coolant comes ready to use straight from the bottle, which costs more but saves you the mixing step.

You can also find ACDelco 10-101 at other major auto parts chains, Walmart, and online retailers. Prices vary slightly by location and whether you choose concentrated or pre-diluted. If you are unsure which form to buy, pre-diluted is the safer choice for a first-time user because the mixing ratio is already correct.

When to check and replace your coolant

Check your coolant level once a month or before long trips. The radiator or overflow tank usually has a "min" and "max" line marked on the side. When the engine is cold, the level should be between those two lines. If it is below the minimum, top it off with the correct coolant type.

For a full coolant replacement, follow the schedule in your owner's manual. Many GM vehicles with DEX-Cool can go 100,000 miles or five years between replacements, but some older models may need it sooner. If you are unsure, your vehicle's manual will have a maintenance schedule that lists the exact interval. Replacing coolant on time prevents rust buildup inside the engine and keeps the cooling system working properly.

What happens if you mix DEX-Cool with other coolants

Mixing DEX-Cool with traditional green coolant or other types is not recommended. The different chemical formulations can react with each other, creating a sludge-like substance that clogs cooling passages and reduces the coolant's ability to absorb and release heat. This can lead to overheating, which damages the engine.

If you have already mixed coolants by accident, the damage is usually not when ready. However, you should plan to have the cooling system flushed and refilled with the correct coolant as soon as reasonably possible. A cooling system flush removes the old coolant and sludge completely, then refills with fresh DEX-Cool. This is a service most repair shops can perform in an hour or two.

How to add coolant to your vehicle

First, make sure the engine is completely cold — wait at least three hours after driving. Locate the radiator cap or the overflow tank cap (your manual shows which one to open). Slowly unscrew the cap by turning it counterclockwise. If you hear a hissing sound, stop and wait longer for the engine to cool.

Pour the coolant slowly into the opening until the level reaches the "max" line on the overflow tank or until coolant appears in the radiator filler neck. Screw the cap back on tightly. Start the engine and let it run for a few minutes, then turn it off and wait for it to cool again. Check the level once more — it may have dropped slightly as the coolant circulates through the engine. Top off if needed.

Signs your cooling system needs attention

Watch for a sweet smell coming from under the hood, which usually means coolant is leaking. You might also notice puddles of orange or green liquid under your parked vehicle. A temperature gauge that climbs higher than normal or a warning light on your dashboard are signs of overheating and mean you should stop driving when ready and let the engine cool.

If your coolant level drops frequently even though you do not see leaks, the coolant may be leaking internally into the engine oil. This is more serious and requires a mechanic to diagnose. Any of these signs mean you should have the cooling system inspected before the problem gets worse.

Frequently Asked Questions

Can I use a different brand of DEX-Cool coolant instead of ACDelco?

Yes. Many brands make DEX-Cool compatible coolant that meets the same specifications. What matters is that the coolant is labeled as DEX-Cool or GM-approved, not the brand name. ACDelco is the original equipment manufacturer version, but other brands work fine if they meet the same standard.

What is the difference between concentrated and pre-diluted coolant?

Concentrated coolant is pure coolant that you mix with distilled water before use — typically 50/50. Pre-diluted comes already mixed and ready to pour straight in. Pre-diluted costs more per ounce but is simpler if you are not comfortable mixing. Both work equally well once in your engine.

How do I know if my coolant is still good or if it needs replacing?

Follow the schedule in your owner's manual — that is the most reliable guide. DEX-Cool typically lasts 100,000 miles or five years. If you are past that point or unsure when it was last replaced, having a mechanic test it is inexpensive and tells you whether it still has protective additives left.

Is it safe to drive with low coolant?

Not for long. Low coolant means your engine cannot cool itself properly, and overheating can cause serious damage in minutes. If your level is low, top it off before driving. If it drops again quickly, you likely have a leak and should have it inspected before the engine overheats.

Can I use DEX-Cool in a vehicle that originally had green coolant?

Not without flushing the system first. The two types should not be mixed. If you want to switch to DEX-Cool, have a mechanic perform a complete cooling system flush to remove all the old green coolant, then refill with DEX-Cool. After that, stick with DEX-Cool for future top-offs.