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Could also be scale built up in the block, especially if it has drain plugs for coolant that have never been used.
Had a slant-6 that had never had the block drain open, had to hammer a nail through the scale under the plug to get it to flow. Then the coolant came out like chocolate.
 

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You're getting VERY little flow through those tubes. Time for a new radiator.
 
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Do you think to get me by until the new one comes I could pull the thermostat to help it flow more through, or would that just make the problem worse from moving coolant too quickly through the engine, not so much the radiator?
Removing the thermostat will not improve the bottleneck at the radiator, and will make the car run richer as it will take longer to warm up.
 

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And if you splice the trans cooling lines with rubber hose, be sure to buy special oil-resistant hose for the purpose, with fuel injection band clamps. Otherwise, in about 3-5 years, that hose will disintegrate, and your transmission will run dry.
 
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