1999 Ford Mustang GT Engine cooling Problems
- Complaints
- 21about this part
- Share
- 58%of 36 total for the year
- Median mileage
- 60,000miles
- Trend
- StableComplaints filed in the last 3 full calendar years are within 25% of the 3 years before.
NHTSA recorded 21 complaints about the engine cooling of the 1999 Ford Mustang GT, 58% of the 36 complaints for this model year. Where a mileage was given, the median is 60,000 miles.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“There was a slight ticking noise coming from engine bay that I thought was an exhaust leak. Eventually the spark plug blew out of the head stripping the top threads out of the aluminum head. In order to fix the car, I had to have a local shop helicoil the head to add threads to the head.”
NHTSA complaint #10174364, filed 2006-11, 123,850 miles“My car is losing coolant through a crack in the plastic intake manifold. Ford will not repair it under any warranty. It is a design flaw that Ford should take care of! Also my car surges in rpms when first starting and shifting into drive,,,very dangerous!!!!!”
NHTSA complaint #10139866, filed 2005-10, 75,000 miles“I have experienced a spark plug blowout in my 1999 Ford mustang with 4.6l v8. I have since read about the vulnerability of these engines to experience spark plug blowout. The first blowout was experienced prior to changing any spark plugs and therefore can not be deemed to be a cause of improper torquing, etc. A heli-coil was used to repair the spark plug blowout, only to have the spark plug blown out again at a later date. This time the cylinder heads were damaged and required replacement. …”
NHTSA complaint #10236576, filed 2008-07, 60,000 miles“(7/23/06) 1999 Ford Mustang Gt, 4.6l blew spark plug for the third time now. The first time was back in 2005 while driving on the 15 freeway heading south at about 8:00 pm. Stop to get gas and upon starting the vehicle to continue my way home it made loud pop and then continued to pop, pop, pop. At first I thought I had an exhaust manifold problem, but upon the repair shop inspection of the vehicle they noted that the number one spark plug had blew out of the piston. …”
NHTSA complaint #10163438, filed 2006-07, 92,400 miles“Crack on the plastic intake manifold at the thermostat housing allowing anti-freeze to leak on the engine. The intake manifold must be replaced at my expense. Ford is aware of this problem and has recalled the faulty intake manifolds on all fleet vehicles but refuses to do anything for privately owned vehicles. This is not right!!!”
NHTSA complaint #10130152, filed 2005-07, 53,564 milesRelated service bulletins
- 10026389May 16, 2008Ford: certain 1999-2001 model year vehicles up to 6000 lb gvwr registered in new york and certain 2001 vehicles up to 6000 lb gvwr registered in the state of maine, certified for…
Engine cooling: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2006 | 6 | 4% |
| 2005 | 6 | 4% |
| 2004 | 3 | 21% |
| 2003 | 11 | 22% |
| 2002 | 16 | 33% |
| 2001 | 13 | 22% |
| 2000 | 21 | 33% |
| 1999 | 21 | 58% |
| 1998 | 44 | 83% |
| 1997 | 16 | 70% |
| 1996 | 24 | 75% |
Other parts of the 1999 Ford Mustang GT
4 complaintsAir bags
2 complaintsElectrical system
2 complaintsSeat belts
2 complaintsSeats
2 complaintsTransmission and drivetrain
2 complaintsEngine
1 complaintsSuspension
1 complaintsTires
1 complaintsVisibility (wipers, defrost, mirrors)
1 complaints
← All problems reported for the 1999 Ford Mustang GT
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 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