MKZ AWD V6-3.5L (2008)
12.
Add one (1) bottle of Motorcraft(R) Premium Cooling System Flush to the degas bottle. (Do not use Motorcraft(R) Cooling System Cleaner
F8AZ-19A503-AA which is for rust removal and will not remove the silicate gel residue).
13.
Add tap water to the degas bottle until the water reaches the maximum of the cold fill range.
14.
Install the degas bottle pressure cap.
WARNING
THE FLUSHING SOLUTION CONTAINS NO GLYCOL, THE SYSTEM WILL BOIL BEFORE THE FANS TURN ON IF THE PRESSURE
CAP IS NOT FITTED CORRECTLY.
15.
Idle the engine for an additional 5 minutes.
16.
Run the engine for 10 minutes at 2500 RPM to clean the cooling system.
CAUTION
IF THE ENGINE OVERHEATS OR THE FLUID LEVEL DROPS BELOW THE MINIMUM FILL LINE, SHUT OFF THE ENGINE AND ADD
FLUID TO THE DEGAS BOTTLE MAXIMUM FILL LINE ONCE THE ENGINE COOLS. FAILURE TO FOLLOW THESE INSTRUCTIONS
MAY RESULT IN DAMAGE TO THE ENGINE.
17.
Drain coolant using Workshop Manual (WSM), Section 303-03.
18.
Remove battery, using WSM, Section 414-01, to gain access to thermostat housing and remove both of the attached heater hoses.
19.
Repeat Steps 7 through 11 to clean the flushing solution out of the cooling system.
WARNING
ALWAYS ALLOW THE ENGINE TO COOL BEFORE OPENING THE COOLING SYSTEM. DO NOT UNSCREW THE COOLANT
PRESSURE RELIEF CAP WHEN THE ENGINE IS OPERATING OR THE COOLING SYSTEM IS HOT. THE COOLING SYSTEM IS UNDER
PRESSURE; STEAM AND HOT LIQUID CAN COME OUT FORCEFULLY WHEN THE CAP IS LOOSENED SLIGHTLY. FAILURE TO
FOLLOW THESE INSTRUCTIONS MAY RESULT IN SERIOUS PERSONAL INJURY.
20.
Refill and add 5.5 quarts (5.2 L) of coolant concentrate, Motorcraft(R) Premium Gold Engine Coolant with Bittering Agent to the cooling system.
Measure coolant concentration and adjust to achieve a 50/50 mix. Set the fill level at the maximum of the cold fill range.
21.
Install the degas bottle pressure cap.
22.
Bleed air from the cooling system using the following procedure and top-off with 50/50 coolant mix if required.
a.
Idle engine until the fan turns on, indicating the thermostat is fully open.
b.
Increase engine speed to 2500 RPM for 30 seconds.
c.
Idle engine for 2 minutes.
d.
Repeat steps (b) and (c) five (5) times.
23.
Verify satisfactory heater performance at idle using the Heater Performance Evaluation procedure. If heater performance is met, return the vehicle
to the customer and do not continue with this procedure. If heater performance is not satisfactory then proceed to Heater Core Replacement.
Heater Performance Evaluation
1.
Idle the engine at an ambient of 60 °F (15 °C) or higher until the engine is fully warmed up.
2.
Set the climate control head to 90 °F (32 °C).
3.
Set the mode to panel/vent and ensure A/C is switched-off.
4.
Set the blower to highest speed.
5.
Idle the engine for 5 minutes with the hood down.
6.
The left-center vent discharge air temperature should be a minimum of 150 °F (65 °C).
7.
If heater performance is met, run the vehicle for 10 minutes at 2500 RPM (to stabilize the coolant silicate concentration in the cooling system)
