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Check to make sure that there is a sufficient level of coolant . If the coolant level is low, coolant may stop circulating through the heater core even if the level is not low enough to cause the engine to overheat. The engine's thermostat may also have failed and is stuck open, not allowing the coolant to rise to the appropriate operating temperature.
Many things. Could be bad thermostat. Head gasket out. Fan/blower relay bad/defective. Not enough antifreeze in cooling system. Check antifreeze for level and strength ith tester. Have to take radiator cap off first, but do it when vehicle is cold. Do you know how to change a thermostat? don't attempt if never done before. Pressure test cooling system or take to autozone/advance auto/o'riellys to have pressure tested. This will tell if your head gasket is blown. You can buy a cheap 5-ball antifreeze tester and check the coolant condition. One more solutions. Coolant system may have to be burped. Possible vapor lock in coolant system if antifreeze change recently and not burped properly.
Check the cooling fan motor and of course the fluid level. If the temp is changing thru the heater it could just be low on coolant , leaking from ? Two wheel drive have an elecrtic cooling fan only, make sure its spinning up when temp is 3/4. If not its probably the fan motor. Can be checked with a test light .
The heater core can be stopped up or thier might not be enought coolant in the system as it has to be full for the heater to heat. The engine also has to warm up so if the therromstate were opening too much and the engine does'nt warm up the water will be too cold and the heat won't work. Remove the heater hoses at the motor conections and blow them though If they are Ok they'll blow though real easy. The cars cooling system does'nt blow very hard and is stopped up real easy. Blowing though with a garden hose reconnect and refill with antifreeze and your good to go. If it does'nt have enough antifrezze it could be frozen and the ice won't cicculate. If this has happened you may need to put the car in a garage to warm it up drain the light antifreeze coolant and put in good coolant withthe right amount of antifreeze.
sounds to be a faulty thermostat did your car over heat my vehicle does the same thing its the thermostat when its cold out your vehicle loses all its engine temperature and blows cold air make sure you use 50/50 antifreeze
Check your antifreeze level and if low then add antifreeze until the radiator is full and the overflow tank is up to the correct level. that should solve your problem. If it isn't that, chances are your thermostat could be stuck open which isn't allowing the coolant to warm up properly.
I had the same problem with the heater only working when accellerating. Found the overflow tank pick up tube was kinked. This of course made my coolant level low. So when the cars hot the coolant would push into the overflow, but when the car cooled the kink would prevent it from flowing back to the radiator.