Heating

You may have air in your system thats trapped in your heater core, or your heater core can be clogged/restricted.

First, drain your system of coolant. Then remove the two hoses that exit your fire wall. (These enter and exit your heater core.) Place a garden hose into one of the hoses and see if water will run through freely.

If not, then have your entire system flushed correctly. If it is flowing freely, then refill with fluid and have the system bled of air.

If you still aren't getting heat, then your heater control valve may be stuck closed. You'll have to take your vehicle to a mechanic to get checked out.

This guide might help you figure this out

https://www.2carpros.com/articles/car-heater-not-working

This is something a shop has to do you would be best off going to the dealer and have them check the programing in power control module

Best guess is thermostat which is an easy attempt at a fix.

Sounds like you still have air in the system. They can be difficult to bleed and get totally full sometimes.

Good job wrenchtech, that's thinking outside of the box. I just assumed that was done already. But the fact that it does blow hot and then not, what do you think, just steam creating the heat? I agree though, not a bad thing to try. With a cold car and the radiator cap off and full of coolant, I would run the car until I saw the coolant drop, knowing that the thermostat did open. Add coolant as necessary, and its good to squeeze the hell out of all of the coolant hoses in order to burp out all the air. Be sure not to get burned or get caught in any belts or fan blades. Let me know how that goes.

No, you can't run these engines with the cap off. They run too hot and will boil if not under pressure. From dead cold, fill the cooling system. Run the engine to operating temp and drive it one mile and then park it until COMPLETELY cold, fill again. Repeat this process until it doesn't take any more fluid.

Even until just after the thermostat opens to verify that it does? That one mile won't ensure that the stat opened, or that the fan engine temp triggered the fan. Burping the air out is the way I like to start, and then I do wrenchtech's way with the checking after short errands.

Hello,

If your coolant level is full then I would say it sounds more like a temperature blend door actuator. Here is a guide to help you see what you are in for when doing the job.

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

Here is the location in your car.

Check out the diagrams (Below)

Please let us know if you need anything else to get the problem fixed.

Cheers, Ken