I have coolant in my car and the level is fine, I don't know if it is half coolant, half water, or 3/4 and 1/4 etc. I checked the hoses coming from my radiator while the engine was hot, the hose on the passenger side was barely warm, the one on the driver's side was Hot! The temperature gauge inside the car barely lifts off 100 degrees, if I stop the car and turn all the blowers off, the gauge will raise just a little. I haven't checked the thermostat.
I hope you have a solution for my problem. Thanks!
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Re: Heater is not getting hot anymore!
Hi Phyllis, it sounds like your thermostat is stuck open, which results in the engine not being able to maintain operating temperature. This would explain the lack of heat. For your car to run at peak efficiency, u need to replace the thermostat, and enjoy having heat again!
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Is the coolant full ? What year an make an model vehicle ? Are the heater hose's going inside through the fire wall hot to the touch ? What condition is the coolant , does it look like a muddy color. GM dexcool coolant turns a muddy rust color , in fact that's what it is ,an It clogs radiators , heater cores , coolant passages in the engine etc.... An some vehicles have a control valve ,or some call it a hot water valve under the hood in the engine compartment . These valves are in the heater hose and are vacuum controlled . These valves do go bad an the hot water isn't allowed to go through the heater core .
There are a number of possibilities.
First, its the level of coolant in the radiator full?
Low coolant level will cause this, because the heater is higher than the engine, so air can rise to the heater and form an air-lock.
Second, is the thermostat good?
A thermostat that is stuck open will not make heat for the heater.
Third, the control valve may be stuck or broken, not allowing the hot water to flow to the heater core.
Usually these are vacuum operated, and usually found under the hood.
God bless your efforts.
First thing to look at is coolant level. It sounds like the coolant pump will push coolant to the heater core and then stops pumping because it has air because to low. If coolant level is full, the vanes on the coolant pump might be spinning on the shaft, in which case you will have to replace the pump.
With blower on high and tempature to max heat check to see if you have good air flow in all mode selections (defrost, vent, floor etc.). If so and you still have no heat then check heater core hose going from engine to inside car to heater core with vehicle running and coolant tempature about half on guage. If both hoses are hot and coolant in radiator/overflow bottle is full then hot cold blend door is stuck in cold position. If coolant level is low you will get no heat, check coolant level first.
Did you mean the only time it blows hot air is under acceleration?
First thing check the coolant level in the radiator. If coolant is low the first hing to stop working is the heat.
If the coolant level is fine but the coolant is muddy I woulds suspect a plugged heater core. You can try back flushing it by removing both heater hoses (engine cold) and then use a garden hose to flush clean water through the heater core. Do this on both pipes going into the heater core. Keep flushing until the water runs clear. Re attache the the hoses, remove the radiator cap, start the engine, let the engine come up to temp and top off the radiator with straight coolant (to comp for the water in the heater core). You may have to repeat this process several times over several days but you should be able to get it cleared enough to get sufficient heat without having to replace it.
Do this when cool. Take radiator cap off, start the engine, turn on heat (not defrost) and now top up coolant to about an inch or 2 from top of radiator, as level drops down, and let vehicle run until the radiator fan comes on, then off, about 3 times, and add coolant as needed while it's running. After that, put radiator cap back on tight & make sure return bottle is filled to proper level. Now try that & see how heat is, temperature gauge etc, and keep an eye on return bottle level for a while. Let me know how it is.
cold weather won't usually hurt anything in your heater, it will just take longer to warm up the cabin.
the lack of heat is a sign that you're probably not getting the proper circulation in your cooling system, that is, the radiator, anti-feeze/coolant, fan, etc.
bad circulation means your anti-freeze level could be low from a leak, or a hose that popped off. or you could have a bad water pump, which is what circulates the coolant through the engine and radiator, even though we don't use water anymore.
the solution is to have someone who knows how check the thermostat, radiator, coolant level, hoses, and water pump to make sure everything is working.
be sure to address the problem soon, because if it's a coolant system problem, the more your drive, the more damage your engien will suffer.
Hi debbie, It could be as simple as the coolant is too low. When the car is cold (not driven for 4 hours or more) check the level in the overflow bottle, it has a level (usually cold and hot), fill to that level., and also take off the radiator cap. The radiator should be filled up to the bottom of the cap. Fill that too. (your car owners manual will show the locations of this, or ask someone who knows abut cars)You should be using a 50/50 (half water half antifreeze)mix of water and antifreeze (coolant).You can also purchase it already mixed at any parts store. When the level is too low, your heater won't work, and your car will overheat, so it's possible it wasn't refilled all the way after the water pump was replaced. Let me know if you have any questions, and how you make out w/ the car. countrycurt0