A/C - Poor Performance

Classification:
HA00-004b

Reference:
NTB00-091b

Date:
December 18, 2001

2000-01 SENTRA POOR A/C PERFORMANCE

IMPORTANT:
This bulletin has been revised.
An Applied Date and Applied VINS were added. Please refer to this bulletin (NTB00-091b) for complete information.

APPLIED VEHICLE:
All 2000-01 Sentra (B15)

APPLIED VINS:
Vehicles built before: 3N1BB51D41L116956 (SR20DE)
3N1CB51D11L460118 (QG18DE)

APPLIED DATE:
Vehicles built before: November 24, 2000

SERVICE INFORMATION

If the A/C system exhibits either of the following symptoms:

^ Increased discharge air temperature from the vents while driving

^ Decreased discharge air flow from the vents while driving

Use the Service Procedure listed to resolve the incident.

This bulletin applies if these symptoms occur after driving the vehicle for about one hour at highway speeds, especially with:

^ High ambient temperature/humidity conditions

^ Low fan speed

NOTE:
In diagnosing this incident, be aware that if this incident has occurred, but the A/C has been turned off for 30 minutes or more since occurring:

^ The A/C may appear to be operating normally when it is turned back on

^ However, the symptoms may return after driving for an hour or more at highway speeds. In that case, this bulletin should be used to resolve the incident.

SERVICE PROCEDURE

1. Remove the A/C evaporator core. Refer to pages HA-73 and HA-74 of the 2000 Sentra Service Manual for the removal procedure.





2. Replace the Thermo Control Module with the new one, making sure the probe is inserted in the evaporator core in the specified new location (see Figure 1).

IMPORTANT:

^ The location of the new Thermo Control Module probe is different from the mold probe location. Make sure the new probe is inserted as shown in Figure 1.

^ Make sure the Thermo Probe clip is fully seated and locked into position (see Figure 1).

3. Install new 0-rings at the evaporator fittings:

^ P/N 92471-N8210 for high side (smaller tube)

^ P/N 92473-N8210 for low side (larger tube)

4. Re-install the evaporator core assembly in reverse order of removal.

5. Remove any residual refrigerant oil or dye from the evaporator fittings.

6. Evacuate and re-charge the A/C system with 0.45-0.55 kg (0.99-1.21 lb) of R134a.

7. Perform a leak check.





PARTS INFORMATION

CLAIMS INFORMATION





Submit a Primary Failed Part (PP) line claim using the claims coding shown.