Im assuming the heater blower motor does not stop working but that the heater output temperature drops. I think you have an obstruction in the line that feeds the heater core.
How To Improve Your Car S Heating This Winter Simplemost
Your Heater Core May Be Clogged.
. Pinched or kinked heater hoses. It means your air will not be as warm as youd like when it comes out of your vents. You may have trapped air in the cooling system or the heater core may be partially plugged up.
Lift the hood and check the temperature where the heater core hoses enter the heater core box. The safest way to do this is with a non-contact infrared thermometer. This might be the easiest solution on our list.
Trapped air can be in the core but it blows out with increased water pump pressure. My heater blows out cold air at an idle warm air when driving. Heater works when driving car but not when at an idle.
This effectively blocks the core when the water pump is at low output idle. Engine coolant is delivered to the heater core through two heater hoses. 1 Coolant level is low 2 some type of blockage is allowing engine coolant to circulate only at higher rpm.
Possible locations or causes of obstructed coolant flow. While a blocked heater core is not one of the most common car heater problems it could ultimately be the cause. Fan motor works fine replaced thermostate and heater core all the doors work on the heater box close and opens properly.
The heater core uses hot engine coolant from your cars cooling system to warm your vehicles cabin. If you dont have enough coolant then the heat exchanger wont be able to well exchange heat. This part is responsible for the circulation of coolant through the cooling system and when the rotor is not able to create sufficient flow the heater blows cold air when the car is idling and when the car is moving it may be slightly warmer.
Up to 15 cash back I have a 1993 mazda 323 no ac. Check the coolant level. If one hose is the same temperature as the coolant and the other hose is cold a blockage might exist in the heater core.
Your cars heater may stop blowing hot air idle or otherwise. All you have to do is top-off your coolant levels. A bad or failing water pump.
If the pump is responsible then it needs to be changed with a new one. The hypothesis that air the core is the issue is at odds with itself. If the vehicle has a valve in one of the hoses check its.
Car heater does not heat.
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