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OG-Larryw1

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I never read anything about testing the rad for a clog in the center. or I missed it.

after the vehicle is warmed up shut it off and place hand onto various area of the radiator fins. the temp should be even. If there is a difference in temp say in the middle. if there is a difference between top section of fins and the bottom section.

then the rad has a plug some where in side. It can't be seen. just my 2 cents
 

99chevy7.4L

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If you still run into a prob with overheating. If it is a 4.3L V6 in the blazer you could get a bad ASS water pump from Stewart Components. Get a stage 2 pump for it and DARE it to overheat. Also if you go that route they will recommend you run straight water with a RUST Inhibitor/ water pump lubricant. The stewart pump with a decent fan such as a taurus fan or one from SPAL will cool just about anything in any situation. Just my experience.
 

Draenor

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I never read anything about testing the rad for a clog in the center. or I missed it.

after the vehicle is warmed up shut it off and place hand onto various area of the radiator fins. the temp should be even. If there is a difference in temp say in the middle. if there is a difference between top section of fins and the bottom section.

then the rad has a plug some where in side. It can't be seen. just my 2 cents
No I found that there were some crushed fins on the inside between the radiator and condensor that were causing a lack of airflow.

If you still run into a prob with overheating. If it is a 4.3L V6 in the blazer you could get a bad ASS water pump from Stewart Components. Get a stage 2 pump for it and DARE it to overheat. Also if you go that route they will recommend you run straight water with a RUST Inhibitor/ water pump lubricant. The stewart pump with a decent fan such as a taurus fan or one from SPAL will cool just about anything in any situation. Just my experience.
I'll keep them in mind.
 

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