NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [MZI-3.5]
DESCRIPTION AND POSSIBLE CAUSES
Does the PCV valve rattle?
No
Replace the PCV valve.
2
Inspect for the following:
z
External leakage
z
Proper dipstick
z
Proper engine oil viscosity
Are all items normal?
Yes
Inspect the internal engine parts such
as valves, valve guides, valve stem
seals, cylinder head drain passage,
and piston rings.
No
Service if necessary.
Repeat Step 2.
3
z
Verify test results.
{
If normal, return to diagnostic index to service any additional symptoms.
(See
ENGINE SYMPTOM TROUBLESHOOTING [MZI-3.5]
.)
{
If malfunction remains, inspect related Service Bulletins and/or On-line Repair
Information and perform repair or diagnosis.
z
If vehicle is repaired, troubleshooting completed.
z
If vehicle is not repaired or additional diagnostic information is not
available, replace the PCM.
(see
PCM REMOVAL/INSTALLATION [MZI-3.5]
.)
17
COOLING SYSTEM CONCERNS-OVERHEATING
DESCRIPTION
Engine runs at higher than normal temperature/overheats.
POSSIBLE CAUSE
z
Improper coolant level
z
Blown fuses
z
Coolant leakage
z
Excessive A/C system pressure
z
A/C system operation is improper
z
Improper water/anti-freeze mixture
z
Fans reverse rotation
z
Poor radiator condition
z
Thermostat malfunction
z
Radiator hoses damage
z
Improper or damaged radiator cap
z
Cooling fan is inoperative.
z
Coolant overflow system malfunction
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:27:37 AM
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