Thermostat crack

2007 CHRYSLER 300
116,000 MILES • 2.7L • 6 CYL • 2WD • AUTOMATIC
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SONOFNUN777
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What would cause the thermostat housing not only crack but, a chunk blew off and of course spewed anti-freeze all over. I know it overheated but what would be the root cause? Thermostat stuck, low anti-freeze?

Thanks

Josh
Jul 10, 2019 at 6:30 AM
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ASEMASTER6371
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Good morning,

Was any work done before this happened?

It could be from excessive pressure? If it was, that tells me the pressure cap is bad. It should release pressure at 16 lbs.

Roy
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Jul 10, 2019 at 7:23 AM
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SONOFNUN777
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The only work done was a replacement of coil pack on cylinder #4 as well as spark plugs being replaced.
Jul 10, 2019 at 7:37 AM
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ASEMASTER6371
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Okay, I would suspect a pressure issue resulting in the failure. I would have the pressure cap tested, the housing and the thermostat replaced.

Roy
Jul 10, 2019 at 7:50 AM
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SONOFNUN777
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Excellent, will do. Would the thermostat need to be changed as well?
Thanks
Jul 10, 2019 at 8:13 AM
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ASEMASTER6371
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Yes, I would change it as well.

You are welcome.

Always glad to help.

Roy
Jul 10, 2019 at 8:16 AM