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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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.
Check the reservoir and radiator for leaks.
Replace any parts they may be failing. If no leaks are found proceed to next step.
Check engine oil. If oil has coolant in it you may have a blown head gasket or crack in the head or engine block. Another sign of a coolant leak into the cylinders is white smoke coming from the exhaust after the engine is warmed up.
You need to have your cooling system pressure tested. This will let you examine the engine area without the hazards of the engine running. You may have head gasket issues. Depending on the area of the leak, your cylinder compression can actually pressurize the cooling system. When the cooling system pressure exceeds the rating of the cap, the cap seal opens and can blow coolant back into the overflow bottle where it eventually leaks while driving. Check to see if your overflow bottle is full.
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.
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.
I'm pretty sure there's a technical service bulletin for this... Something about the blower control module shorts internally... Yep, just found it. TSB 04-01-39-009B shows a replacement blower module for this problem. And yes, it will have to be programmed. Good luck
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) You should not drive it 'till you find the leak or if the problem isn't serious, it will be.
hate to ask but did you put the thermostat in rightside up ? and someone else might be right did you bleed the system and get the air out of it? sometimes there is a air lock that will drive you crazy.. another thing when you replaced the water pump did it heat up before you changed it ?? if so did you put right gaskets on it for correct flow.. ? thanks Jerry if you have more holler
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.