1991 K1500 no heat issue

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Red350

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The outlet radiator core got the same bad flow and the nipple at the radiator let coolant go in the tank
It’s been a long time, I didn’t had the chance to wrench on my truck but I finally found the problem

Here’s some pictures
 

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Schurkey

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Not what I expected, but glad you found it.

Can you tell what's plugging the fluid path inside? Rust flake? Something else? Is there more of that contamination in the engine, that would plug the replacement fitting?
 

Red350

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It looks to be some “thread” residue and corrosion that blocked the passage. The coolant only had a needle size hole to go through ! The coolant is fine and I have plenty of heat

Thanks for all your reply and I hope it will help someone else!
 

HotWheelsBurban

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It looks to be some “thread” residue and corrosion that blocked the passage. The coolant only had a needle size hole to go through ! The coolant is fine and I have plenty of heat

Thanks for all your reply and I hope it will help someone else!
That's good that you got it figured out, and that you shared the fix. One thing I know about Montreal; you do need a functional heater for much of the year! ( I read a lot of mysteries, and Kathy Reichs is one of my favorites. Her description of winter in Quebec will make you cold in Texas summertime!)
 

Red350

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That's good that you got it figured out, and that you shared the fix. One thing I know about Montreal; you do need a functional heater for much of the year! ( I read a lot of mysteries, and Kathy Reichs is one of my favorites. Her description of winter in Quebec will make you cold in Texas summertime!)
Totally agree! One thing for sure is I would love to spend my winters in Texas!
 
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