I cant figure this out
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Joined: Feb 2005
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From: Spencer, Ma
I recently bought the truck and the previous owner had said that his mechanic just changed the water pump, because it was leaking, and he went ahead and installed new rad. hoses, a new thermostat gooseneck(chrome) bling bling......lol and a new thermostat, so that was the first thing i checked, u cant be too sure these days, i tested it on the stove and re-installed it, it was correct the first time
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Joined: Feb 2005
Posts: 20
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From: Spencer, Ma
No he went with green, no mixture here, I drove the truck through another northeast snow storm this last weekend, man she runs like a top.....gonna try the heater core backflush, when the weather gets a little better, if it ever does 
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Joined: Mar 2005
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hot into the core- cold out suggests a plugged core.
a hot top radiator hose and a lower hose that is not quite as hot is normal!! the radiator is a heat exchanger. hot goes in the top and as the coolant cools down it gets denser, that is why radiators flow the way they do. takes advantage of the physics of fluids.
long ago I had an Olds diesel with a no heat problem. in this case it was a bad water pump providing insufficient flow to force the coolant through the core.
a combustion leak into the cooling system is a possibility but remote since there are usually other more severe symptoms. but a quihere is a quick check when the system is cold :
remove the coolant overflow hose from the radiator fill neck
replace the hose with another hose and stick it into a 2 liter pop bottle filled with water
remove the radiator cap and completly fill with coolant. replace cap.
start the engine and watch for air or gas bubbles in the 2 liter bottle. it is normal for some as the air is purged from the hose and any trapped in the cooling system.
however by the time the upper hose get warm and or the T stat opens there should be no more bubbles.
if no bubbles no ciombustion leaks.
have you tried taking off both heater hoses and running water through the core to check the flow?
a hot top radiator hose and a lower hose that is not quite as hot is normal!! the radiator is a heat exchanger. hot goes in the top and as the coolant cools down it gets denser, that is why radiators flow the way they do. takes advantage of the physics of fluids.
long ago I had an Olds diesel with a no heat problem. in this case it was a bad water pump providing insufficient flow to force the coolant through the core.
a combustion leak into the cooling system is a possibility but remote since there are usually other more severe symptoms. but a quihere is a quick check when the system is cold :
remove the coolant overflow hose from the radiator fill neck
replace the hose with another hose and stick it into a 2 liter pop bottle filled with water
remove the radiator cap and completly fill with coolant. replace cap.
start the engine and watch for air or gas bubbles in the 2 liter bottle. it is normal for some as the air is purged from the hose and any trapped in the cooling system.
however by the time the upper hose get warm and or the T stat opens there should be no more bubbles.
if no bubbles no ciombustion leaks.
have you tried taking off both heater hoses and running water through the core to check the flow?