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Engine coolingPart report

2021 Chevrolet Blazer Engine cooling Problems

Complaints
3about this part
Share
2%of 141 total for the year
Median mileage
63,000miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 3 complaints about the engine cooling of the 2021 Chevrolet Blazer, 2% of the 141 complaints for this model year. Where a mileage was given, the median is 63,000 miles.

Fewer than 15 complaints name this part, so treat the figures as a rough indication only.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“The contact owns a 2021 Chevrolet Blazer. The contact stated that a technician identified a radiator leak during an emissions test after smelling an abnormal coolant odor. The technician confirmed that the coolant had leaked from the vehicle. Prior to the discovery by the technician, the contact’s husband observed white smoke coming from the engine. The fluid levels were checked and were normal at that time despite the smoke. Additionally, the contact stated that the message Steering Assist Reduced was displayed on the instrument panel prior to the failure. The vehicle was not repaired. …”

NHTSA complaint #11763020, filed 2026-09, 46,860 miles

“The contact owns a 2021 Chevrolet Blazer. The contact stated that upon turning off the vehicle, the fan remained engaged for approximately 10 minutes. Additionally, the contact stated that the A/C system was intermittently inoperable. The contact stated while driving at an undisclosed speed, the vehicle made an abnormal sound, and the contact noticed that there was a coolant leak onto the floor of the vehicle. An unknown warning light was illuminated. The vehicle was taken to East Houston Auto Electric, where it was diagnosed that the thermostat was stuck and needed to be replaced. …”

NHTSA complaint #11646473, filed 2025-03, 95,000 miles

“The contact owns a 2021 Chevrolet Blazer. The contact stated that oil was leaking from the vehicle. There were no warning lights illuminated. The vehicle was taken to the local dealer, where it was diagnosed that the cam shaft carrier needed to be replaced. The vehicle was repaired, but the failure recurred. The vehicle was taken to an independent mechanic, who determined that there was a separation in the transmission, oil cooler line, valve, and hoses that needed to be replaced. The vehicle was not repaired. The manufacturer was contacted and submitted a complaint. …”

NHTSA complaint #11587410, filed 2024-05, 63,000 miles

Engine cooling: other model years

YearComplaintsShare of year
202424%
202325%
202212%
202132%
202031%
201911%
2008120%
200517%
200448%
200368%
2002208%
2001237%
20006311%
19996214%
1998649%
19979312%
199614913%
199521317%
1994427%
19935110%
199293%
1991125%
1990516%
1989411%
1988718%
198727%
1986526%
1985517%
1984111%

Other parts of the 2021 Chevrolet Blazer

Engine
42 complaints
Electrical system
40 complaints
Other or unknown
24 complaints
Brakes
21 complaints
Transmission and drivetrain
19 complaints
Fuel system
18 complaints
Steering
15 complaints
Forward collision avoidance
8 complaints
Tires
5 complaints
Suspension
4 complaints
Lane departure
3 complaints
Air bags
2 complaints

← All problems reported for the 2021 Chevrolet Blazer

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology