Technical No heat??

New thermostat, flushed the heater core. I have air blowing from the floor vent but no hot air. Any ideas on what the fix might be?
Thanks.

 

Pics and more info needed

 

What car, what kind of heater? Depending on the year of the car it could be a air door not opening, heater control valve, hoses hooked up wrong or to the wrong place, coolant blockage. So we need pictures of the heater and pictures of the engine compartment to help.

 

You might have an air lock. Try filling the rad with a heater hose disconnected and plug it back in when the antifreeze appears.

 

Yep, seems pretty common to get an air lock.

 

Come on, guys! We are WIZARDS!

Ben

 

^^^^^ Forgot to add water.

 

Warm up the engine?

 

Is either hose to the heater hot?

If one is hot, and the other is cold, you either have air trapped in the line, or a plugged heater core, or a valve or heat control turned off or closed.

If neither is hot, the coolant level is too low, or the thermostat may be defective, these days, something being new doesn't always mean the part is good.

 

Is the heater core higher than the top of the radiator? or lower than the filler neck on the expansion tank if it is a rig with an expansion tank. That would cause an airlock if it was noticable above the other high point of the cooling system.

As Kevko mentioned, photos of how the hoses are hooked up on the engine speak big. the outlet from the engine to the heater should go from the head or intake to the heater and the return should go back to the water pump unless you have a late model GM with a cross flow with the heater return hose going to the cold side of the radiator. = 70's chevy truck.

 

The hoses are hooked up correctly. I flushed the system when i changed the thermostat. I think based on the replies here that there may be an air lock. I do see the coolant flowing through the radiator. Seeing the flow, could there still be an air lock? Thank you

 

Yes and let it run with the radiator cap off for about 25 minutes

 

63 buick lesabre. Hoses are hooked up correctly. I disconnected the outlet hose and flushed the core. Water was coming out freely and clear

 

I have air coming out of the vent but only luke warm. Hoses are hooked up correctly.

 

Sounds like a blend door is not moving or adjusted correctly. Unless the heater hoses going in and out are not hot. Then it’s the water valve.