Ive changed my [water pump](/topics-water-pump/) my therm...

Ive changed my [water pump](/topics-water-pump/) my thermostat the [heater core](/topics-heater-core-chevy/) connectors that were leaking did a [head gasket](/topics-head-gasket-chevy/) test and it was negative oil looks great fan...

Ive changed my [water pump](/topics-water-pump/) my thermostat the [heater core](/topics-heater-core-chevy/) connectors that were leaking did a [head gasket](/topics-head-gasket-chevy/) test and it was negative oil looks great fans work but it keeps overheating and when im filling it with fluid with the overflow cap off when it heats up it starts shoving the fluid out of the reservoir doesn't look like there is any more leaks it a 2006 silverado 1500 with a 4.8 in it what else can i do? Mechanic's Assistant: What part of the Chevrolet is the leak coming from? And are you sure it's water? It was coming from the water pump and the heater core hose connections but i replaced those Mechanic's Assistant: Are you fixing your Silverado 1500 yourself? What have you tried so far? Yes ive changed the water pump changed the thermostat changed the heater core connectors and did a head gasket leak test

Automotive Expert
Good Afternoon, my name is \*\*\*\*\* \*\*\*\*\* ill be helping you, so sorry to hear about the issues here on the Silverado. I know how frustrating it can be to deal with overheating. Now what head gasket test did you do and with what results?

I rented the little pump thing from O'Reilly and put the combustion leak indicating fluid in it let it warm up kept the fluid level 2 or 3 inches lower than the tester and the results came back fine color never changedOh i pumped the little black pump thing u put in top of it for more than 2 min but it said only 2 minThe oil looks great its not milky
Automotive Expert
ah okay. the oil does not have milky for a head gasket to be blown. i would recommend we run the test again and this time test using compression since that is the most accurate of a test. since other than an internal leak we are finding the only thing that makes sense would be a clogged coolant passage in the [engine](/topics-engine-chevy/). thats very rare but can happen and its usually the last thing is suspected after everything has been ruled out.

The motor only has 60000 miles on it and how can this be fixedI keep thinking maybe theres an air pocket in it i cant get out or somethingthe clogged coolant passage? With a coolant flush?
Automotive Expert
sometimes yeah but not always, it depends on the blockage. if it is a blockage and the flush does not work then the block would need to be replaced.

first i should have it flushed? What about a pressure tester i think maybe they make something like that
Automotive Expert
yes first step would be the flush and you can try to pressure test the system to find a blockage or confirm a leak but its not the most accurate since its not an official step. i would also recommend we compression test to be sure we are sealing internally.

When it heated up the top [radiator](/topics-radiator-chevy/) hose got hot but the bottom one that goes to the thermostat was wasnt near as hot
Automotive Expert
ah okay so yeah coolant is flowing

Ok ill try to go flush the system and see about getting this compression test done hopefully the flush works. How long do i have to talk to u about this?
Automotive Expert
you can respond here after the fact and i will still get the messages

Ok great i will be doing that thanks for your help
Automotive Expert
no problem!

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