Anti-Freeze Solution Mixture Percentage; Radiator Cap Inspection; Radiator Cap Valve Check; Negative Pressure Valve Check - Mazda 626 MX-6 Workshop Manual

3. Set the heater control switch to the maximum heat
position.
4. Flush the cooling system with water until all traces
of color are gone, then let the system drain com­
pletely.
5. Fill with the proper mixture and amount of ethy­
lene glycol-based coolant.
Caution
a) Do not use alcohol- or methanol-based
coolant.
b) Use only soft (demineralized) water in the
coolant mixture.

Anti-freeze solution mixture percentage

Protection
Above -16°C (3°F)
Above -26°C (-15°F)
Above -40°C (-40°F)
6. Run the engine at idle with the radiator cap re­
moved. Let any air bleed from the system, and add
more coolant.
7. Install the radiator cap, and inspect all connections
for leakage.
RADIATOR CAP
INSPECTION
Radiator Cap Valve
1. Remove foreign material (such as water residue)
from between the radiator cap valve and the valve
seat.
2. Attach the radiator cap to a tester with the SST.
Apply pressure gradually to 74—103 kPa
(0.75—1.05 kg/cm2, 11—15 psi).
3. Wait about 10 seconds; then check that the pres­
sure has not decreased.
Negative Pressure Valve
1. Pull the negative-pressure valve to open it. Check
that it closes completely when released.
2. Check for damage on the contact surfaces, and
for cracked or deformed seal packing.
3. Replace the radiator cap if necessary.
86U03X-009
RADIATOR CAP 3
Volume percentage
Gravity at
20°C (68°F)
Solution Water
35 65 1.054
45 55 1.066
55 45 1.078
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