A/C - Poor Heater Performance
88pontiac04Bulletin Number: 88-1-8
Reference Number: 831103
Publish Date: 2/88
Subject: HEATER PERFORMANCE
Models
Affected: 1988 GRAND PRIX
Some comments about heater system performance with 1988 Grand Prix such as it being slow warm up or having inadequate heat, may be received from some customers.
If the heater system is operating properly and the engine temperature is in the operating range, the cause of the problem may be reduced air/heat distribution from the heater outlet. This condition may be addressed by the following rework procedure of the hush panel and the heater outlet duct.
FIGURE 1:
Procedure:
1.. Remove the left hand hush panel from under the Instrument Panel
(I.P.).
2. Using a sawblade cut off the right hand side of hush panel (as shown in Figure 1).
FIGURE 2:
3. Remove the adapter duct that joins the heater module to the rear seat heater duct (as shown in Figure 2).
FIGURE 3:
4. Remove the rear heater duct that is mounted with three (3) screws to the heater module (as shown in Figure 3).
FIGURE 4:
5. Using a sawblade or diagonal wire cutters cut off the short vane located at the top side of the rectangular outlet hole (as shown in Figure 4).
6. Reinstall the rear heater duct, adapter duct and the left hand hush panel.
Labor Operation Number: T1313
Labor Time : 0.5 Hours