Insufficient A/C PERF. When Using Front System Only (63-12-07)

Publication date: 1996-05-01
Reference number: 63-12-07

INSUFFICIENT A/C PERF. WHEN USING FRONT SYSTEM ONLY

TECHNICAL SERVICE BULLETIN

Reference Number(s): 63-12-07, Date of Issue: May, 1996

INSUFFICIENT A/C PERFORMANCE (WITH C34 - REAR A/C) WHEN USING FRONT SYSTEM ONLY (ADD 1/4 LB R134A TO SYSTEM)

Model(s): 1996 Chevrolet Lumina APV

1996 Oldsmobile Silhouette

1996 Pontiac Trans Sport

Section: 1 - HVAC

Bulletin No.: 63-12-07

Date: May, 1996

VEHICLES AFFECTED

- 1996 Chevrolet Lumina APV

- 1996 Oldsmobile Silhouette

- 1996 Pontiac Trans Sport

with rear A/C, RPO C34 built prior to the following VIN breakpoints:

VIN BREAKPOINTS INFORMATION

Model	VIN Breakpoint
Lumina APV	117248
Silhouette	306374
Trans Sport	212925

CONDITION

Some owners of the above listed vehicles with the rear A/C option, RPO C34, may comment on insufficient air conditioning performance when using the front system only.

CAUSE

This condition may be caused by refrigerant bleeding through the rear TXV and being captured in the rear evaporator and suction line. When this happens, the front system is starved of refrigerant and results in poor air conditioning performance from the front system.

CORRECTION

This condition may be corrected by adding an additional 1/4 lb (0.25 lb) R134a to the system for vehicles built prior to the above identified VIN breakpoints. Vehicles built after these breakpoints will include the additional 1/4 lb (0.25 lb) charge.

NOTE: Future service to the A/C system on any 1996 U Van should include the additional 1/4 lb (0.25 lb) charge.

PROCEDURE

Recover the existing R134a, then evacuate and re-charge the system to include the additional 1/4 lb (0.25 lb).

WARRANTY INFORMATION

For vehicles repaired under warranty, use:

LABOR OPERATION NO.: T2042

LABOR TIME: 0.7 hr.