The National Highway Traffic Safety Administration has officially closed its investigation into 2001-'11 Porsche 911 vehicles after receiving a number of consumer complaints of rapid coolant loss.

The decision means that nearly 24,635 vehicles won't be recalled.

"Most of the leak complaints did not appear to involve complete separation of the fittings and many were detected when the vehicle was parked," NHTSA said.

The 911 vehicles are equipped with Turbo, GT2 and GT3 engines.

The cars were being investigated for "rapid coolant loss caused by coolant pipe-fitting failure, allegedly resulting in vehicle disablement and/or loss of vehicle control due to reduced traction for the affected vehicle or following traffic," according to the description posted by NHTSA website.

Federal safety regulators investigated nearly 63 consumer complaints and 336 warranty claims related to the issue.

At least 10 complaints of sudden coolant loss on 2001-'07 Porsche 911s were received by the NHTSA.

"A safety-related defect has not been identified at this time and further use of agency resources does not appear to be warranted. Accordingly, this investigation is closed," said the NHTSA. "The agency will monitor this issue and reserves the right to take further action if warranted by the circumstances."

No crashes or injuries have been linked to the alleged defect.

See Now: OnePlus 6: How Different Will It Be From OnePlus 5?