Heater Cores and Blower Fans
Car Heaters

Why would the heater blow cold air when stopped but regular heat when you start moving?


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2011-09-13 17:23:47
2011-09-13 17:23:47

The water level in the radatior is lower than the inlet of the heater core. At idle the water flow is not high enough and the air bubble in the cooling system moves to the highest point in the system The heater core, Now hot water, no heat

Check your thermostat, when the car is sitting still it may not be getting the cerculation it needs


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Because the car needs all the power it can get to start so you heater and maybe radio cut out for a few seconds.

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there seems to be a short in the electrical system, i would start by checking the heater switch,

Because there is not enough air flow over your condenser (the part that takes the heat away from your car) when your car is stopped but when you start moving again the air circulation gets better so the car cools off

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It will stay at rest and only start moving if a force is applied.

did the heater core start leaking? anyway you should have no problem with the air if you bypass the heater core.

you start moving at a pace in between walking and running

Since US stopped slavery

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