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Why does my car's heater blow hot when the car is moving but not blow hot when the car is stopped with engine idling?
Wiki User
∙ 13y ago
There are two probable causes for the heat when moving only condition:
- The additional engine (and water pump) speed during locomotion could be compensating for a lack of coolant flow through the heater circuit, while the heating system is "starved" of adequate coolant flow at idle speed.
- Turning off hot air flow (say, due to lessened current input during idle), or . . .
- Sensing too high cabin temperature during idle and so adjusting air mixture too low.
- Due to an electrical fault, the electronic interior heat/ac control system could actually be:
I recommend first that any objects on the cabin floor or under the seats which could be interfering with air flow and with cabin temperature monitoring should be removed; as well as anything blocking any heater air out let, including on the dash board.
If that doesn't fix . . . then look for faults under the hood/bonnet such as low coolant level and stuck thermostat.
Next, have heater/ac control systems checked out.
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Wiki User
∙ 13y ago
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