2019 GMC Acadia · symptom sheet
Engine overheats or leaks coolant
- 26owner reports
- 55,114median miles
- 0involved a crash
Newest report Sep 18, 2026 · checked Oct 2, 2026
58 of the 386 complaints on this car are about the engine. 26 of those describe overheating.
Tick what matches of 26 reports
Overheating on other Acadia years
No other Acadia model year has enough reports of overheating for a sheet of its own. See every Acadia year.
What this problem usually is
Most owners in this group notice the coolant before they notice the heat: a reservoir that keeps dropping, a sweet smell, or a bright puddle under the front of the car. Across the vehicles on this site, about four in five of these complaints mention coolant, a leak or a puddle, and roughly two in five mention the temperature gauge or overheating.
What got replaced
Owners who name the part that was replaced mention the thermostat (21 reports).
Recalls and investigations
No recall on the engine covers the 2019 model year as of Oct 2, 2026.
When it happens
The middle half of failures fell between 48,500 and 70,000 miles, from the 10 reports that gave a mileage.
Is this a known problem?
The manufacturer has sent NHTSA 5 service bulletins or notices for the 2019 GMC Acadia that deal with this problem. Newest first.
Federal rules make a manufacturer send NHTSA a copy of any notice about a defect that goes to more than one dealer or owner. Most of these are service bulletins, the repair instructions manufacturers send to dealers. NHTSA generally leaves safety recall bulletins out of this file, and recalls are listed separately.
This service bulletin provides a repair procedure to correct a customer concern of Coolant and/or Oil Leak, Malfunction Indicator Lamp (MIL) Illuminatedâ.
This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that may have oil mixed in with the engine coolant.
This service bulletin provides diagnostic information for the technician regarding a customer concern of engine overheating, cooling system contaminated with engine oil.
This Preliminary information communicates a possible noise from the water pump causing a DTC and the diagnostics for the repair.
1 more on the 2019 GMC Acadia page.
What owners wrote
“I bought a car about 2 months ago and they did not tell me the thermostat was bad and they wonât cover it.”
Filed Nov 23, 2025
“Due to negligence of gmc wright of wexford during the replacement of 3rd new transmission they did not clamp a hose together causing coolant to leak and my thermostat to come on n off. Causing further damage to my vehicle”
Filed Oct 12, 2025
“Unknown My 2019 Acadia Denali has/is been repaired 6 times in 1 1/2 years for engine oil leaks , has had transmission repairs twice , radiator repair and replacement. Also suspension warranty work as well . I feel the oil leaks is and has been excessive and dangerous due to no warning lights never displayed to alert me to check oil”
Filed Sep 3, 2025
“My coolant thermostat went out, causing my AC and steering assist to stop working. I have spoke to multiple other people who have had this same issue with their GMC Acadia and I believe this should be a recall. Itâs going to cost me $1200 to have this issue resolved.”
Filed Jun 29, 2025
Should you keep driving it?
This page can't tell you that. 0 of 26 reports involved a crash. Owners who file are the ones who had a bad experience, and nobody checks their reports. If the problem affects steering, braking, power or a fire risk, treat it as a safety fault and have it inspected before a long or high-speed drive.
File your own report with NHTSA. Complaint counts are how a problem gets an investigation. How reports land on this sheet.
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