1999 Porsche 911 Engine cooling Problems
- Complaints
- 2about this part
- Share
- 25%of 8 total for the year
- Median mileage
- 120,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 2 complaints about the engine cooling of the 1999 Porsche 911, 25% of the 8 complaints for this model year. Where a mileage was given, the median is 120,000 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.
“Was driving and massive amounts of antifreeze leaked out of the back onto the road and on my tires. Engine then started to smoke and overheat. Could have been very dangerous. Overflow reservoir cap was screwed on tightly so that was not the issue. I read that there were some issues with the 2001-07 Porsche 911. My engine was replaced in 2003 so perhaps it was retrofitted with the problem parts. It will be at the ray catena Porsche dealership in edison nj tomorrow for repairs.”
NHTSA complaint #10522740, filed 2013-07, 120,000 milesRelated service bulletins
- 10249916Jan 29, 2024Information on PIWIS tester update 42.500.005
- 10243588Sep 5, 2023Manufacturers certificate for an overview of approved Porsche A40 engine oils.
- 10243587Sep 5, 2023Manufacturers certificate for an overview of approved Porsche C40 engine oils.
- 10243586Sep 5, 2023Manufacturers certificate for an overview of approved Porsche C30 engine oils.
- 10243585Sep 5, 2023Manufacturers certificate for an overview of approved Porsche C20 engine oils.
- 10242132Aug 25, 2023Parts information on parts withdrawal for the oil pump
- 10240439Jul 31, 2023Manufacturers certificate for allocation of approved engine oils
- 10233941Mar 24, 2023Manufacturers certificate for approved engine C20 engine oils.
- 10232393Feb 13, 2023Overview of approved engine A40 oils for all Porsche models that use A40 oil.
- 10232392Feb 13, 2023Overview of approved engine C40 oils for all Porsche models that use C40 oil.
Engine cooling: other model years
Other parts of the 1999 Porsche 911
3 complaintsElectrical system
2 complaintsEngine
2 complaintsAir bags
1 complaintsBrakes
1 complaintsSteering
1 complaints
← All problems reported for the 1999 Porsche 911
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 28, 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