Nissan has a Technical service bulletin on the radiator cap allow air to get into the radiator cause by defective radiator cap.
1/12 Classification: Reference: Date: HA02-002c NTB02-047c March 7, 2007
2002 - 2006 ALTIMA; POOR HEATER PERFORMANCE
This bulletin has been amended. The Applied Vehicles and Service Procedure sections have been changed. Please discard all previous versions.
APPLIED VEHICLEs: 2002 - 2006 Altima (L31)
IF YOU CONFIRM
Air from the heater on an Applied Vehicle:
- Takes a long time to warm up after an engine cold start, or
- Output air cools down and is not warm enough while the engine is at idle, or
- Output air is not warm enough at any engine speed,
Refer to the DIAGNOSTIC FLOWCHART on page 2 to determine the course of repair. That course may include all or some of the following:
- Coolant Mixture Inspection procedure (page 3).
- Coolant Mixture Correction procedure (page 5).
- Cooling System Bleed Procedure (page 6).
IMPORTANT: The purpose of "ACTIONS" (above) is to give you a quick idea of the work you will be performing. You MUST closely follow the entire Service Procedure (starting on page 2) as it contains information that is essential to successfully completing this repair.
Nissan Bulletins are intended for use by qualified technicians, not 'do-it-yourselfers'. Qualified technicians are properly trained individuals who have the equipment, tools, safety instruction, and know-how to do a job properly and safely. NOTE: If you believe that a described condition may apply to a particular vehicle, DO NOT assume that it does. See your Nissan dealer to determine if this applies to your vehicle.
Perform Coolant Mixture Inspection (page 3).Be sure to use special tool J-23688 Coolant Refractometer.Is the ethylene glycol mixture between 50-55%?Perform Cooling System Bleed Procedure (page 6)Is heater performance OK?Perform Coolant Mixture Correction Procedure (page 5)EndReturn to ASIST for further diagnostic informationNOYESNOYES
If only the coolant inspection and system air bleed are done, submit a Primary Operation (PO) line claim using the following claims coding:
Coolant Inspection and cooling system air bleed only