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overheating problems in my larson 2007

J

jcmg24

New member
Need help
If I cleaned the manifolds, replacing water pump and impeller (brand new), looking that I have pressure in the houses and !! keeps overheating my vortec 4.3 engine 2007…..what can I do ?
Do I need to look for cracks? My oil is clean…. No mix
 
step 1 compression check,Was thermostat checked in pot of hot water,openning at correct temp. Is engine fresh water cooled?salt water?
 
Compression is check and ok in 6 cil. thermostat brand new and inspected, the engine is fresh water cooled.
I’m frustrated
 
it is a vortec , mercruiser....I am really sad.
If for some reason, inside the the engine exist a clog … should I need to take it out ?
 
I already clean the manifolds with water pressure and acetone , do you think the problem still there ?. the clog could be there ?
 
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