Cooling System - Clean & Flush After Repairing Leak

86porsche03

Subject: Flushing Cooling System

Model All Liquid

Cooled

Group

1

Part Identifier

19---

Number

8617

October 17, 1986

If engine oil enters the cooling system it has to be cleaned and flushed after repairing the leak. Also change the engine oil and oil filter.

Work procedure:

I. a) Drain coolant (Radiator and crankcase drain plug).
b) Remove expansion tank and clean, using a "radiator cleaner". Reinstall tank.
c) Fill cooling system with 2 quarts "radiator cleaner" and water.
d) Run engine to operating temperature and bleed system.
e) After thermostat opens set heater control lever to "warm" and run engine with increased RPM for approximately 2 minutes.
f) Stop engine, drain system.

II. Repeat steps C through F.

III. Flush system with water only until no oil or "radiator cleaner" is noticeable in the water.

IV. Fill cooling system with water and coolant. Bleed cooling system.

Refer to Repair Manual Volume I Group 19, Replacing Coolant and Bleeding Cooling System.