Heater T and No Heat

[Killacaviar]

Hey all,

Not often that I do this but, I need some help from the hive mind.

Backstory:
I blew a heater T on Hells Revenge two weeks ago. Bybassed the Heater core, filled it up with coolant and went on my way. No issues. Actually kept wheeling and towed the camper the 500 miles home.

Since it’s been warm here in CO I have not been too motivated to fix it properly. Well today I dug in a replaced the two heater Ts with metal ones and the hoses/clamps as well.

The heat worked great prior to the mishap and the AC is still lovely and cold. The truck hasn’t skipped a beat and has a new water pump, thermostat etc.

The problem:

I can’t get the heat to blow hot. I feel the hoses building pressure with coolant in them, check fuses, let it run for 30 minutes with the heat blasting.

Nothing…

What am I missing and/or what should I be looking at. It’s not pressing, but I would like to put this behind me. Hopefully it’s something simple

 

[94SRUNNER]

Sounds like there still could be an air in the system. May try using a coolant specific funnel as pictured below. I have found these help during the coolant filling process. You could also rent a coolant vacuum pump to speed it up.

 

[lx200inAR]

I used the gravity feed funnel and you have to rev to get the pump spinning faster to push out the air. I’d say I spent a solid 15-20 minreving up between 2 and 3 k RPM. The nice thing with the funnel is you can watch the air bubbles come out. Just letting the engine idle wasn’t doing it for me.

 

[GrouchyTech]

15-20 min is about 13 minutes too long.
Put a coolant funnel on it, get it warm, squeeze upper hose a few times, blip your revs from idle to 3K and back 10 times or so, let idle 30 seconds, repeat. Should be good to test drive after that. Fill reservoir, drive it a mile or two, turn it off, wait 10 min and top off the reservoir again.

 

[Boston Mangler]

15-20 min is about 13 minutes too long.
Put a coolant funnel on it, get it warm, squeeze upper hose a few times, blip your revs from idle to 3K and back 10 times or so, let idle 30 seconds, repeat. Should be good to test drive after that. Fill reservoir, drive it a mile or two, turn it off, wait 10 min and top off the reservoir again.

This guy gets it

 

[bloc]

The part about 3k revs is very important. The RPMs are needed to get enough flow into the system to knock the air out of the high spots.