Heater is not working? IM cold!

Bleed air from the system which is probably the problem.

Here is a guide that will help you fix the problem.

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

Please let me know what happens so it will help others.

Best, Ken

I would first make sure that the thermostat is working. Take it out and boil it up in a pot on the stove and see if it opens fully. If in doubt replace it and the gasket as well.

Have have seen where people will lift the rear of the car or the front up about 2 feet while burping to help get the air out but it could be pumped into the coolant system by a blown head gasket. Here is a guide to check just in case.

https://www.2carpros.com/articles/head-gasket-blown-test

Please let us know what you find. We are interested to see what it is.

Cheers, Ken

I think you have a 3.4L engine. The most likely suspect is a leaking cylinder head gasket. That can allow combustion gases to sneak into the cooling system. If it pools under the thermostat, it can fail to open resulting in no coolant flow. That means no hot coolant giving up its heat at the radiator and no hot coolant to the heater core in the dash. Thermostats need to be hit with hot liquid to open. Hot air won't do it.

Your mechanic can do a quick, five-minute chemical test at the radiator to test for one form of a leaking head gasket. That involves drawing air from the radiator or reservoir through a glass cylinder with two chambers partially-filled with a special dark blue liquid. If combustion gases are present, the liquid will turn bright yellow.

Check coolant level. It is probably low and for both heater hoses being hot. See pictures for way to bleed air. Air bleed will either be on thermostat or near top of radiator.