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2019 Regal TourX 2.0L Turbo - Coolant Leak & Low Coolant Warning

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Mike T. · rep 0 · May 25, 2:44 AM · 1 replies · solved · Question

Vehicle: 2019 Buick Regal TourX Essence

Hey guys,

I'm having a persistent issue with my 2019 Buick Regal TourX, which has the 2.0L turbocharged engine. For the past few weeks, I've been getting 'Low Coolant' warnings on my dashboard, and I've had to top off the reservoir several times. I've also noticed a faint sweet smell of coolant, especially after driving.

I've looked around the engine bay, and I can see some pinkish residue (from the Dex-Cool coolant) on the passenger side, near the front of the engine, but it's hard to pinpoint the exact source without tearing things apart. There's no visible smoke from the exhaust, and the oil looks clean, so I don't think it's an internal head gasket issue.

Has anyone with a 2.0T Regal TourX or similar GM vehicle experienced coolant leaks in a common area? Any tips on where to look or what parts are usually the culprit? No check engine light yet, thankfully.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:44 AM

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ClearTheCode admin answer:

A coolant leak on a 2019 Buick Regal TourX with the 2.0L turbocharged engine is a relatively common issue, and the symptoms you describe (low coolant warning, sweet smell, pink residue) are classic indicators. The 2.0T engine (LTG/LHU) used in various GM vehicles often has specific failure points for coolant leaks.

Common Causes & Diagnostic Steps:

  1. Water Pump: The water pump on these engines is a frequent culprit. It's typically located on the front of the engine, often on the passenger side. Leaks can develop from the pump's seal or weep hole.
  2. Thermostat Housing/Bypass Valve: The plastic thermostat housing and its associated coolant bypass valve assembly are also prone to cracking or developing leaks over time, especially where plastic components meet metal. This is often visible as residue around the housing.
  3. Coolant Hoses/Fittings: Inspect all visible coolant hoses and their connections, particularly those near the areas where you see residue. Clamps can loosen, or hoses can degrade.
  4. Oil Cooler/Heat Exchanger: The engine oil cooler (often integrated with the oil filter housing) also uses engine coolant. Leaks can develop from its seals, though this might also lead to coolant mixing with oil or vice versa (which you've ruled out for now).
  5. Radiator: While less common for persistent, localized leaks, the radiator itself could have a small crack or pinhole leak, especially if the vehicle has seen road debris.

When to See a Shop:

  • Soon: A persistent coolant leak, even if slow, can lead to engine overheating and severe damage if the coolant level drops too low. It's crucial to get it diagnosed and repaired.
  • Professional Diagnosis: A mechanic will typically:
    • Perform a cooling system pressure test: This involves pressurizing the cooling system with a hand pump and observing for drips or the source of the leak.
    • Use a UV dye: Adding a special UV dye to the coolant and then inspecting with a UV light can help pinpoint even very small leaks.
    • Inspect common failure points: They will specifically check the water pump, thermostat housing, and associated hoses.
    • While you don't have a CEL, a P0128 (Coolant Thermostat Rationality) code can sometimes appear if the engine isn't reaching operating temperature efficiently due to a leak or stuck-open thermostat.
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