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probley because you have the heater on
That was a poor answer, and the question deserves better. When accelerating, the car's engine generates higher RPM's, which causes the water pump to spin faster. This added pressure from the water pump is sometimes enough to push coolant past a heater core that is having problems (perhaps you have a clogged heater core - this can be remedied by reverse-flushing the heater core).
Others have also suggested that the car exhibiting the symptoms may have a low coolant level. The added pressure from the water pump at higher RPM's is enough to allow even a car with a low level of coolant to circulate some of the coolant through the heater core. It might also be worth checking your coolant levels if you have not already done so (note that you should check not only the coolant reservoir, but also the level of coolant within the radiator itself).
Good luck.
What else can I help you with?
Why does your heater not blow out warm air?
if the heater does not blow out warm air change the setting.
What would cause the heater on a 1997 Grand Am Gt to not warm up completely and only blow slightly warm air?
It could be the thermostat on the engine. If the engine does not warm up adequately the heater will never blow hot air.
Heater on but not blowing warm air?
heater on at idle and will not blow warm air. when moving it blows the warm air from the vents. what will cause this
Why is your heater blowing out warm air in your 1990 buick regal?
Isn't a heater supposed to blow warm air?
Can a thermostat cause your car's heater to blow warm air?
Yes.
What would cause a 98 dodge 1500 4x4 heater to blow luke warm air?
Any heater that only blows luke warm air isn't getting warm or hot water to the coil. This sounds like a problem with the thermostat not closing, and allowing the engine to heat the water properly for the heater.
Why does your heater not blow warm air?
Heater core may be plugged . Flush the cooling system, also check thermostat.
Why does the heater blow cold air instead of warm air?
The heater may blow cold air instead of warm air due to issues such as low coolant levels, a malfunctioning thermostat, a clogged heater core, or a faulty blend door. These problems can prevent the heater from properly warming the air before it is blown into the car.
What would cause the heater to blow only cool to warm air not hot air in a 2004 Chevy Impala?
It could be that you need coolant or it's low.
Why will the heater not blow warm air on a Chevy s10 pickup?
Check your anti-freeze levels
What could cause the heater or defrost to NOT blow warm or hot in a 1988 Ford Bronco ll?
Blocked heater core, faulty heater valve, disconnected connection to the heater valve.
How can I effectively use a blow heater to keep warm during the winter months?
To effectively use a blow heater to keep warm during the winter months, place the heater in a central location in the room, keep the doors and windows closed to retain heat, and set the heater to a comfortable temperature. Make sure to follow all safety instructions and never leave the heater unattended.
