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Antifreeze to hot

I have a 2003 Chevy trailblazer Lt with 160,000 miles on it. I’m having a problem with the anitfreeze. When I drive more than 20 miles I have to turn my car off because my check gauges light comes on. I pop my hood open and you can hear bubbling noises coming from the resivor. I have a brand new radiator, water pump, fan clutch, and thermostat. Air and heat work perfect in the car. Just don’t understand why the antifreeze won’t stay cool. Help!

When the engine is cold, remove the radiator cap and start the engine.

While the engine idles, watch the coolant in the radiator.

If bubbles begin to form in the coolant, that’s an indication of a breached head gasket.



+1 to tester’s post.
I’d suggest verifying the possibility with a lab test (a kit available at any parts store that chemically tests the coolant for the presence of hydrocarbons) or a pressure leak down test (again, available at any parts store but a bit more complicated to perform than the first test I mentioned).

Post back with the results. We do care.


It would help if you explained what motivated you or your shop to install all those replacement parts. It may be that whatever that problem is, remains.