Heater not getting hot?

You may have a part blocked heater core, try flushing first.

Take heater hoses off and use a garden hose to see what flow is through the heater core, the noise may be an air lock in the system, you will need to make sure all air is bleed from the cooling system as well.

You have to go behind the dash to check -could be an air mix/ blend/mode door that is not opening or an actuator/vacuum and hose problem.

Low coolant level, bad thermostat or possible blown head gasket from overheating

Roy

Hello -

So was it working fine and then all of a sudden not hot air or was it gradually getting cooler and cooler then quit?

How does the temperature gauge of the engine read... Normal?

With the engine at normal operating temperature... Feel both heater hoses going into and out of the firewall....... Do they both feel hot or is one colder.

What is your engine size in liter?

Hello -

Thanks for the info Brian

To me, I lean to the control panel or blend door area. . .. . ..my reasons. . ...see what you think..

You said you flushed the heater core hoses, so I assume that means you flushed the heater core and had good water flow from both sides of the core. That would indicate the core is okay.

The temp of the vehicle was very cold. . .. . ..you changed the thermostat. . ...heater was working fine. . .. . .temp of engine. . ...fine. That would indicate again, the heater core is working okay and the water pump is working okay.

Why did you replace the control panel. . ...do you have an automatic or manual system..

How are you verifying the blend door is working as it should?

Are you sure the connectors are definitely secure on the back of the panel since you had it removed and or there are no wires pulled out.

Also, that there are no vacuum lines that came disconnected or split when you removed it.

Then you said it just stopped. . .. . .. . .. . ...

Now the only thing that may point to the inlet control valve or possible poor cooling system operation is you said the hoses were warm. The hoses should be too hot to handle.

Here are some tests for you. . .. . .. . .. . .. . .

Here are some tests for you for insufficient or erratic or not heat.

Have you checked for a sticking thermostat, a clogged heater core or the heater control valve?

Need to pressure test the coolant system, checking for leaks
when engine cool open and check coolant level in the radiator
start cold engine and check coolant in radiator
if all OK and no heat inside
check heater hoses by firewall if both hot problem is inside heater box and suspect blend door actuator