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could be low on antifreeze, or if antifreeze is too weak it can freeze up and you wont get any warm antifreeze through the heater core, if its blowing sort of warm but not hot it could be thermostat, and maybe even the hot cold switch is not working
Antifreeze goes into the radiator. There should be both a radiator cap and also an overflow reservior. Top off the radiator and fill the reservoir to the "max fill" line. NOTE: DO NOT remove the radiator cap when the engine is warm. You'll get burned
The radiator is usually the black tank in front of the fan. It has a silver cap (DO NOT REMOVE WHEN HOT!!!) that you can take off when the car is cold to check if there's fluid in it. The reserve coolant tank is usually a white plastic and has a hose in to that connects to the radiator. It is used to catch the extra fluid that comes out of the radiator when it warms up becasue coolant expands when it's heated. The reservior should have two marks on the side of it. One for "max fill" and one for "add". Add coolant to it if it is below the "add" line. If it's extreamly low, you'll have to add coolant a coulpe times to level it off once air gets out of the system. Your best bet is to remove the radiator cap, top it off with the right antifreeze (you can get this pre mixed) and replace the cap. Then fill the reservoir with the right antifreeze to the max fill line and drive the car until it gets warm. About 10 minutes. Then top off as necessary. I do NOT recommend using plain water to do this. If you use water it can freeze and do extensive damage to your engine. Go to your local auto parts store and ask them for the correct antifreeze. Ask them how to mix it or purchase the pre mixed kind.
Quite a few idea's come to mind. 1) Thermostat is stuck open, causing the engine to run cool. 2) The vacuum valve that opens and closes the air "flap" is stuck open, allowing cool air in all the time. 3) The vacuum valve that opens and closes the line that feeds the heater core isn't opening all the way.
You have air trapped in the system. If you have cold air, warm air, cold air from your heater, then it's air entrapment. Very common these days. Go to a shop that uses vacuum method to refill cooling system & that will purge air. Otherwise, you can try. Park uphill. cold engine - fill radiator to top with 50/50 mix of antifreeze. leave cap on but loose. fill reservior to 3/4 full. Turn heater to hot to allow coolant to flow through heater core. start engine, run at 1500 rpms until thermostat opens and upper hose is hot. tighten cap and let it cool down. after cool check level of reservoir. fill to top line on reservoir. it should **** coolant back into radiator as it cools down. repeat if still an issue.
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Check your anti-freeze level. 9 out of 10 times, it's just low on antifreeze. Your heater takes the heat from the warmed antifreeze,once the engine is warm, and blows the heat off and into the car. If the anti-freeze is low or the motor is cold you wont have heat.
Your thermostat may not be working properly. Coolant flows thru your heater core where the blower motor blows that heat from the coolant thru your vents. If the coolant is not warm enough wich is a sign that your thermostat may be stuck open or opening too soo, your air may be colder than normal.