Heater blows cold air

Hello,

This sounds like you have a problem with the blend door actuator for the temperature. Here is a guide to help you see what I am talking about.

https://www.2carpros.com/articles/replace-blend-door-motor

Here is the location for your car (below)

Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken

Or it could be a possible short in the wiring or a possible HVAC controller going bad. Do you have auto matic temp controls

You need to have the air bled from the cooling system.

I"ve had alot of these vehicles do this, they have air in the cooling sys. Try this bleeding procedure:Poor heat at idle, however, if the engine RPMs are raised the concern no longer occurs.

Recommendation/Instructions:
Note: Be sure to follow all SI safety procedures and caution notices.

With the engine cooled off, remove the coolant pressure cap.
Remove upper heater core hose from the metal pipe on the engine.
Add coolant to the metal pipe, until full.
Raise the rubber portion of the heater core hose as high as it will go with it still attached at the heater core. Using a funnel, add coolant until the hose is full.
Reconnect the heater core hose.
Start engine, have assistant raise the RPMs to about 1500 to 1700 RPMs, top coolant off at engine, then before lowering engine RPMs, install the coolant pressure cap.
Fill coolant reservoir as necessary, then check the heat at idle.
Note: If the vehicle returns for the same complaint perform the cooling system draining and refilling procedure
see if this makes a difference, post back with any other questions.

Try bleeding the coolant sys, Poor heat at idle, however, if the engine RPMs are raised the concern no longer occurs. With the engine cooled off, remove the coolant pressure cap.
Remove upper heater core hose from the metal pipe on the engine.
Add coolant to the metal pipe, until full.
Raise the rubber portion of the heater core hose as high as it will go with it still attached at the heater core. Using a funnel, add coolant until the hose is full.
Reconnect the heater core hose.
Start engine, have assistant raise the RPMs to about 1500 to 1700 RPMs, top coolant off at engine, then before lowering engine RPMs, install the coolant pressure cap.
Fill coolant reservoir as necessary, then check the heat at idle.
Note: If there is still a lack of heat at idle, perform the cooling system draining and refilling procedure
post back with what you find

Check coolant level first thenif low add and then have pressure checked for leak.

Yes low coolant level will cause heating loss. If leak is not external then likely intake manifold gasket or cylinder headgasket fault.

Try replacing the thermostat and see what happens

This may be a thermostat or head gasket problem have it pressure checked for leaks as it may be leaking between block and head. And have thermostat checked as that may be the problem as well.