Roadmaster Estate Wagon V8-350 5.7L VIN P SFI (1996)
8.
Install a new thermostat, P/N 12555290. Refer to Thermostat Replacement in the Service Manual
Install a new front heater hose/valve assemble which includes the tee and the flow control assemble, P/N 10258504. Refer to Heater Inlet and
Outlet Hoses in the Service Manual.
9.
It is not necessary to replace the rear heater hoses attached to the heater core unless the hose condition warrants replacement.
10.
Install a flow restrictor in the small hose between the coolant recovery reservoir and the throttle body. The restrictor kit includes the flow
restrictor, clamps and the instructions (P/N DE-148 - see Parts Information).
Important:
When adding coolant, it is important that you use GM Goodwrench DEX-COOL(R) coolant. If coolant other than DEX-COOL(R) is added to the
system, the engine coolant will require change sooner at 50,000 km (30,000 mi) or 24 months.
11.
Concentration:
The chemical inhibitors in DEX-COOL(R) are a critical part of protecting the cooling system. The inhibitors provide more than just freeze and
boil protection, they are the necessary components for overall corrosion protection of the cooling system. A proper mix of 50/50 DEX-COOL(R)
and water is essential. A 50/50 mix ensures that the proper amount of chemical inhibitors are in the coolant.
Notice:
At low concentrations (less than 30% DEX-COOL(R) to water), these inhibitors may not be able to adequately provide corrosion protection and
damage may occur to the cooling system components.
Important:
Radiator drain and fills are a major contributor to improper coolant concentration. Drain and fills only remove about half of a cooling system's
coolant. When the new coolant is added, it combines with the old coolant (with depleted chemical inhibitors) and the resulting mixture is
considerably less than a 50/50 mix. For this reason, radiator drain and fills are no longer recommended as a means for a coolant change service.
Low coolant concentration can also result from topping off the cooling system with water and improper filling when system components are serviced.
See table for fluid capacity specifications.
Important:
Because the cooling system was flushed with water and not all the water is removed from the coolant system, it is critical that you first fill the coolant
system to one-half it's capacity with new 100% DEX-COOL(R) to maintain the proper concentration.
Continue to fill the coolant system with new 50/50 DEX-COOL(R). Refer to Draining and Filling the Cooling System in the Service Manual. Also,
refer to Corporate Bulletin # 00-06-02-006 on engine coolant information.
12.
Test the coolant concentration. Refer to Coolant Concentration Testing in the Service Manual.
