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Why is my 2005 chevy avalanche loose coolant, FAST. I did pressurize the system, but didn't find any leaks. Found TSB from GM about cylinder heads cracking at oil passage issue, but oil is clean.

Iam a tech, but this one is bothering me. I put system under pressure with pressure tester for like 1 hr, but didn't see any leaks. no white smoke, but loosing a lot of coolant fast. I can smell coolant, but don't see any leaks. anyone has seen anything like this??

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Coolant can and is lost without getting in the oil from a leaking head gasket or cracked head or block. In the years as a dealer tech most often oil was not in the coolant.

Posted on Dec 28, 2016

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Chevy 2005 cavalier low coolant light keeps coming on and the coolant reservoit tank is empty after only 200 miles. what is causing this?


  1. Check the hoses and clamps going from the reservoir to the radiator and from the radiator to the engine. Make sure they are flexible and in good condition.
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have a compression test done to check for head gasket problems . check for cracked head . Check for corroded faces where the coolant can get into the exhaust system . a pressure test done and check for leak behind the water pump body. Check for leak in the heater core.AS to the oil pressure problem replace the oil sender unit and check for the results.

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Sounds like a leaking head gasket , or head itself is cracked. If overheating because of sticking thermostat heater would still work. Get it check fast cause next is a blown engine. I guess head might not be torqued properly. Take it back to overhauler and check for oil in your anti-freeze too.

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I have 2005 chevy avalanche and my blower stays on when the truck is off. what could be the problem?


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Don't worry about filling a cylinder with coolant. If coolant goes into a cylinder, you will need to remove the head anyway to replace the gasket. The coolant itself will not damage anything unless you try to run the engine.
If that is somehow necessary you can purge the coolant by removing the plugs ans spinning the engine over (put rags over the plug holes or it will go everywhere)
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Could be vacuum leak or bad ignition wire(s).

I had a similar problem on my "93 Ford probe. The engine idled pretty rough with shakes, Turned out to be a head gasket leaking engine coolant into the cylinder during low rpm's. At fast rpm's it was fine becuase the internal cylinder pressure was greater than the hot coolant pressure & would prevent the coolant from leaking in.

A friend has the same problem with his "94 Blazer 4.3 L, throttle body injection, manual tranny. He hasn't fixed it yet, It started a few weeks ago & is getting worse. His gets a fast idle with hiccups which causes the engine shake. He already checked the EGR valve. He also has a severe exhaust problem, Not oilly but very gray & terrible smelly, but only when the fast idle problem happens. THis fast idle hiccup problem starts when the engine is warmed up.

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