Car heating issues in very frigid temps

Sounds like a problem with airflow thru the condenser. It could be an issue with the fan clutch. If it is not free-wheeling properly, it can restrict airflow thru the radiator and condenser. This will prevent proper removal of heat from the return refrigerant and reduce the cooling.

Bad gas would cause engine to misfire run rough or not run at all. It would not cause the engine not to warm up, keep checking your anti freeze to make sure its staying full, if its staying full sounds like the the thermostat is sticking open and not letting your engine warm up properly

year??????

There are two rubber hoses, about has big around as a thumb, going into the firewall just above where the front passenger's feet would be. First thing I would check is to see that both are warm after the car warms up. These are the coolant supply and return lines for your heater core. If it is plugged, one will be warm and the other cool. Generally interior heating problem where the engine is otherwise normal will be a heater core issue.

I`m positive you have a bad head gasket.I just did one for a friend of mine that had the same problem on his Buick Rondevous.Same motor.These are good motors but they have a tendency to blow the head gaskets.It is usually the back one for the #1 cylinder.Hope this helps.Good luck.

When your engine thermostat has failed or is sticking open, the engine fluid isn't able to reach a temperature that lets your heater core get hot enough to produce worthwhile heat to blow into the passenger's compartment. It is also not good for your engine to run below design temperature.
If you have a dashboard temp gauge, if your thermostat is stuck open, that gauge will probably stay in the cold area.
I would think that that is the problem, and I would have the thermostat changed (not a very difficult or expensive job).
Hope this helps you.

no check the thermast

Could be a faulty thermostat. Take a piece of cardbourd and cut it so you can put it in front of the radiator and fix it so it will stay there. Drive the car and watch your temperature gauge to see if it warms up faster but be careful as to not let it overheat. If it starts to heat up cut a 1/4 of the cardboard so a little more of the radiator shows then watch the temperature gauge. Leave it there for the winter then take it out. That is the cheapest remedy when it is cold. I take it when your heater blows it is not not every warm is that correct?

It may be the valve that controls the amount of water entering heating core but I'm wondering if your engine thermostat isn't stuck open. This is what controls the coolant temperature in your engine. It closes off while engine is off. It will remain closed after you start your car until the water warms to a certain temperature then it starts to open enough to keep your car at the proper operating temperature. If it stick open then it will take a lot longer for the engine to heat up and on smaller cars might never heat up enough for your heater. If you live in very cold climates such as where I live in Wyoming, we have to change to a higher degree thermostat so we have a good heater when it's 30 below zero.

Be very cautious here but one way you can check this is to put a piece of cardboard in front of your radiator and stop the airflow that cools your engine coolant. THIS WILL CAUSE YOUR CAR TO HEAT UP AND CAN CAUSE ENGINE DAMAGE IF IT OVERHEATS. Don't completely cover the radiator but if your heater warms up when you put the cardboard in front of radiator it's a good sign that your thermostat is stuck open and needs to be replaced.

fans do not need to run until 235 degrees. A/C has to be done at a dealer