SYMPOSIA PAPER Published: 01 January 1999

Fleet Test Evaluations of an Automotive and Medium-Duty Truck Coolant Filter Conditioner


The use of coolant filtration and supplemental coolant additives (SCA) to replenish depleted protective chemistry has been applied in the heavy duty diesel arena for many years. Some filtration of coolant and SCA usage in light gasoline engine and automotive diesel engine vehicles has taken place using off-board equipment to filter and recondition coolant. As concerns about the environment have increased, disposal of spent coolant that is replaced on a scheduled basis is a burden on fleets as well as individuals. In addition, as the efforts by vehicle manufacturers to extend or eliminate routine service intervals of vehicle systems increase, the use of an on-board system has become more attractive.

A number of filtration/conditioning designs have been developed for light and medium duty use and have been on field tests for over a year. These field tests are described and reported, along with background on the filter design and chemistry package used. Field testing included: low and high mileage vehicles; newer and older vehicles; well and poorly maintained vehicles; and an assessment of the possibility of overcharging of the coolant chemistry.

Author Information

Wright, AB
MD/HD Product Design, AlliedSignal Filters & Spark Plugs, Perrysburg, OH
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: D15
Pages: 370–391
DOI: 10.1520/STP38258S
ISBN-EB: 978-0-8031-5566-4
ISBN-13: 978-0-8031-2610-7