2005 Chevy Truck Silverado Engine Overheating

BIGJOHNE

MEMBER
2005 CHEVROLET TRUCK

Engine Cooling problem
2005 Chevy Truck V8 Four Wheel Drive Automatic 75k miles

I have a 2005 Z71 that overheated about 2 months ago. I let it cool down and added coolant, and it has been fine until today. My wife was driving and it overheated, she said the AC got warm and the guage was pegged. I can hear boiling in the upper hose and there is NO evidence of a leak. The fans work, and when I cracked open the cap, the level came up quickly. Is there a service bulliten on this or a known issue? Thanks in advance.

3 Replies

DR LOOT

MECHANIC
2,311 POSTS

It was obvious 2 months ago that the thermostat was malfunctioning, now the thermostat has struck shut and you overheated the vehicle I hope it is still okay with the needle pegged that is approximately 260 ° depending how far she drove it could have went as high as 310 °. My advice to you is replace the thermostat and keep your fingers crossed

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Saturday, July 25th, 2009 AT 2:37 PM

BIGJOHNE

MEMBER
2 POSTS

Well it may be the thermostat, but where is the water going? Boiling off? Also, are these trucks known for thermostats going bad this quickly?

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Saturday, July 25th, 2009 AT 2:47 PM

DR LOOT

MECHANIC
2,311 POSTS

Depending on the strength of your coolant yes it will boil off, about the thermostat no one ever knows what the thermostat is going to malfunction it could be a manufacture defect when they installed it, or the factory damaged it when they installed it or other variables it is easy enough to start at the thermostat that we know what happens.

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Saturday, July 25th, 2009 AT 3:00 PM