The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

Low Coolant Light on 2017 LaCrosse - Suspect a Leak

0

Mike T. · rep 0 · May 25, 2:47 AM · 1 replies · solved · Question

Vehicle: 2017 Buick LaCrosse Premium

My 2017 Buick LaCrosse Premium, with about 70,000 miles, recently triggered the "Low Coolant" warning light. I checked the reservoir, and it was indeed low. I topped it off, but I'm worried there's a leak somewhere. I haven't seen any puddles under the car, but I do smell a faint sweet odor occasionally.

What are common leak points for this model, and what coolant type should I use? Any tips for tracking down a slow leak?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:47 AM

0

Hello Robert,

A low coolant light and a sweet odor are classic signs of a coolant leak, even if you don't see puddles. Slow leaks can evaporate before hitting the ground, especially on hot engine components. Your 2017 Buick LaCrosse uses GM's DEX-COOL (Orange or Pink) extended-life coolant. It's crucial to only use DEX-COOL or a compatible equivalent, as mixing different types can cause gelling and system damage.

Common Leak Points for Buick Models (including LaCrosse):

  1. Water Pump: Often a weep hole will show signs of leakage.
  2. Thermostat Housing/Gasket: Plastic housings can crack, or gaskets can fail.
  3. Radiator End Tanks: The plastic end tanks on the radiator are prone to cracking over time.
  4. Hoses and Clamps: Inspect all coolant hoses (radiator, heater, bypass) for cracks, bulging, or loose clamps.
  5. Heater Core: If you smell coolant strongly inside the cabin, it could be a leaking heater core. Check for dampness on the passenger floor.
  6. Reservoir Tank: The plastic expansion tank itself can crack.

Tips for Tracking Down a Slow Leak:

  • Visual Inspection: With the engine cool, carefully inspect all hoses, connections, the radiator, and the engine block for signs of dried coolant residue (often a crusty, colored stain).
  • Pressure Test: The most effective way to find a slow leak is to perform a cooling system pressure test. A specialized tool connects to the radiator cap and pressurizes the system, making leaks more apparent. Many auto parts stores rent these tools.
  • UV Dye: You can add a special UV dye to your coolant. After driving for a bit, use a UV light to find glowing leak spots.

When to See a Shop:

  • If you cannot locate the leak yourself.
  • If the leak is from a difficult-to-access component (e.g., heater core, rear engine components).
  • If the engine is overheating or if the coolant level drops rapidly, indicating a significant leak that needs immediate professional attention.
  • If you suspect an internal leak (e.g., head gasket issues, though less common for just low coolant and sweet smell, it's possible if there's white smoke from exhaust or oil contamination).
Menu

Help & account