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2000 Lifted 4x4 Astro 92 V8-350 Shorty
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Make sure you have the correct thermostat... and you have it in correctly.
(I remember one poster put his in upside down)
The later models use a "two valve" stat (with an important bypass).
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Also one hose connects to manifold (send) and the other to water-pump (return)
 

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2000 Lifted 4x4 Astro 92 V8-350 Shorty
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Try looking it up on Rock Auto?
 

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2000 Lifted 4x4 Astro 92 V8-350 Shorty
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MotoRad thermostats make them with a "jiggle pin" which is loose (moves up/down in hole).
It's a bleeder there to reduce thermal shock of cold/hot mix when themostat first opens.
It may also help pass trapped air when closed to.

I normally use this model.. but if not I drill my own hole.

What is important is that correct thermostat is used with dual valves (with newer blocks).
When closed to radiator, the lower valve is open... circulating warmed coolant within the engine block, improving warming time.
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2000 Lifted 4x4 Astro 92 V8-350 Shorty
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This thread is about "freezing to death"...
You think you got it bad... be sure to see my post about "FALLING IGUANAS"
 
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