[radrobbie]

well, I was a little premature on thinking the coolant system was fixed.

Still having overheating issues.

I took the thermostat out and poured coolant into the radiator. It quickly came out of the thermostat housing. I put the housing back together without the thermostat in. I could see coolant moving right to left in the radiator neck. So I assume the system is not blocked and water pump is moving coolant. If I put the thermostat in the truck will overheat within a few minutes.

truck will run for a while and appear to be doing ok and eventually heat up. When it does heat up I've noticed the overflow tank will be full and even blowing coolant out of the top. However, when the truck cools down the coolant doesn't seem to be going back into the radiator.

I have driven for over an hour on the highway and the temp stays at the low end of normal operating range.

after cooling down I will have to add maybe a pint or so of coolant.

I took the air plenum and fuel injection rail off to check for leak. Apparently I did fix the leak on the coolant tubes. very little coolant on the top of the block. What little there is appears to be coming from a small leak at the head/block area. There was less than a tablespoon of coolant sitting there.

When the truck is running at a good tempature range there is still very little heat from the heater. When it starts to go hot there is cold air coming from the heater.

Is it time to try a new radiator? (I had put a used one in that seemed in good shape)

What about the coolant not being sucked back into the radiator?