Mazda CX-9 This larger SUV adds a V6 option, as well as more cargo room, to the CX-7 option.

Need help with 07 mazda cx-9 overheating

Old 10-03-2017, 12:09 PM
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Join Date: Oct 2017
Location: Texas
Posts: 2
Default Need help with 07 mazda cx-9 overheating

Hey guys I took on this job and im stuck! It was overheating so we did the obvious first. Replaced thermostat and resovoir. Test drove and still overheated. Replaced water pump and it helped but still overheating. Ran a pressure test and holds pressure. Radiator is new. No coolant in oil. What next? Any help will be greatlg appreciated. Thanks
Old 10-03-2017, 01:17 PM
Join Date: Jun 2016
Location: Washington, the state
Posts: 86

Is the temperature actually what the sensor is telling you?
Is the radiator clean inside & outside?
Fan working as it should?
Good airflow through the radiator? All the original air baffles & shrouds in place?
Did a hose collapse internally and block the water flow?
Old 10-03-2017, 02:11 PM
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Join Date: Oct 2017
Location: Texas
Posts: 2

Yes the temp is reading correctly. It starts gushing out of the resvoir. No trash or anythkng blocking the radiator. Everything is in place. Took it to the Mazda dealership and they had to tear to the engine to diagnosis it. Nothkng has been changed or removed from OEM. When it overheats the gauge goes up to 3/4 of the way but dosent go any further. Just stuck now and do not know what else tk do.
Old 10-05-2017, 05:42 AM
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Join Date: May 2012
Location: Queensland Australia
Posts: 3,528

Can you confirm the fans are working?

Try wiring the fans up full time, go for a drive & see what happens.

Have you flushed & backflushed the entire cooling system?

Is it loosing/using any coolant?

Have you carried out a TK test?

Pressure test the cooling system when hot(20psi), remove all the sparkplugs, crank the engine, while still pressurised & see if any coolant flies out the sparkplug holes. A good test for a blown headgasket.
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