2018 Audi A5 Engine cooling Problems
- Complaints
- 1about this part
- Share
- 3%of 38 total for the year
- Median mileage
- —not reported
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 1 complaints about the engine cooling of the 2018 Audi A5, 3% of the 38 complaints for this model year.
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.
“I own a 2018 Audi A5. Many critical cooling system parts — including the thermostat housing, water pump housing, radiator end tanks, breather tubes, and quick-connect hoses — are made of plastic and sit in constant exposure to coolant temperatures over 200°F. Over time, these components become brittle, crack, and fail prematurely. Recently, the plastic breather/return hose between the coolant reservoir and the radiator broke apart during routine service due to brittleness. …”
NHTSA complaint #11690455, filed 2025-09Engine cooling: other model years
Other parts of the 2018 Audi A5
8 complaintsOther or unknown
8 complaintsBrakes
4 complaintsElectrical system
4 complaintsBody and structure
4 complaintsVisibility (wipers, defrost, mirrors)
4 complaintsAir bags
3 complaintsTransmission and drivetrain
3 complaintsSteering
2 complaintsSuspension
2 complaintsExterior lighting
1 complaintsForward collision avoidance
1 complaints
← All problems reported for the 2018 Audi A5
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