My heat doesnt blow out anymore sometimes it'll cut on but the majority of the time it doesnt blow

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It sounds like either a fuse for blower motor or wires to it. Or blower motor may have just quit. Depending on the year..make..and model.. could be vacuum or electrically controlled. Check fuses first!!!!Also. Check coolant level aswell!!!! Sometimes low coolant doesnt allow heat to blow through the vents. Just cold. If you are low on coolant. Refill it when vehicle is cooled down after not driving. Check after 2 hours of driving. If level has changed. Check under oil cap for milky consistency. Check for visible leaks on ground. Hope this helps get you started

check the controller an vacuum lines

Check to see if your heating system is properly filled. Air in system can often prevent the proper flow of hot coolant into the radiator core resulting in your issue.

No heat or low heat in a water cooled engine is worthy of an immediate check as major damage to engine could be the result of continuing to drive it. Things to check:

These two things may cause no heat and possible not ever show as a problem on the temp gauge or temp warning light until far to late:
Low coolant/antifreeze level
Frozen coolant/antifreeze
Stuck thermostat

Other possibilities that may/may not show other signs of trouble as well:
Failing water pump (this would also explain some noise, typically like a grinding, scraping or bad bearing noise)
Slipping belt (Typically associated with the famous belt squealing or chirping noise)
Clogged radiator and/or heater core
Non-operating temperature control valve
Stuck thermostat

Hope this helps!

It sounds to me like your engine coolant level may be exremely low and your engine is probably severly overheating. I would recommend checking your coolant (antifreeze) level and checking for possible engine damage due to overheating.

Make sure that your antifreeze is up where it should be.

Hi i'm ryan, is it blowing cold air, or just won't come on at all? If its blowing cold air try checking the antifreeze level, low levels will cause it to blow cold air. If it is just not comming on at all, try checking the fuse for the heater.

Check the pipes, when you get only cold air, it is often becose one of the air lines is broken.

Do You mean air doesnt blow cold or fan doesnt blow strong.If you mean it doesnt blow cold that means you need to have a/c recharged.The reason it gets cold after being on the road for a while is because compressor takes time to cool freon when it is very low