1. Drain the Coolant! Studies have proven that low nitrite levels in Texaco NOAT systems can only result from contamination and dilution of the coolant. The coolant chemical balance has been destroyed rendering the coolant completely ineffective. Drain the system, flush with water until clear, then proceed.
2. Refill the system with FLEET CHARGE. Since this system is subject to contamination, refill with Fleet Charge antifreeze mixed 50% with water. Regular, fully-formulated Fleet Charge is less expensive and more forgiving than Texaco Extended Service. If this system becomes contaminated again, it can easily be fixed, at less cost.
3. Install a Need-Release filter. They remain in service 150,000 miles, 15 months, or 3,000 hours . They are used on systems that contain 28 gallons of coolant, or less. They automatically monitor the coolant’s condition and provide a booster charge of SCA when appropriate. Check the filter to see if it is due to be changed and replace if necessary. If the system has no filter, skip this step.
(Note: Previous versions of the Need-Release filter were limited to coolant systems with capacities of 20 gallons.The current Penray Need-Release may be used on systems up to 28 gallons, filled with fully-formulated (I.e. Fleet Charge brand) coolant, such as transit coaches.)