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There are a few reasons this could happen but the most likely is that the Thermostat is stuck open. This means when you don't have much load on the engine the Coolant which powers your heater does not have enough time to warm up. Then while driving you put a load on the engine, increasing the amount of heat created which will warm the coolant.
There could be other reasons for this is well, but I believe that in most vehicles replacing the thermostat is a somewhat simple and inexpensive job.
What else can I help you with?
What causes a raddleing noise on the passenger side of the motor only when it is idleing on a 97 ford ranger 2.3l?
It could be one of the heat shields on the exhaust system
Why does the heater only work when you are driving?
Because the heater pulls the heat off of the motor and uses fans to circulate it to you
Why would a car only blow cold air when driving?
Only blows cold air with the a/c on while driving, your cooling fan or fan clutch is bad depending on the year, make and model.......... Only blows cold air with the heater on while driving, you will have a bad or broken internal a/c - heater control door.....
What is wrong when you can only smell gas fumes when the car heater is on?
what are you driving? email me direct if you wish
Why would the heater quit working while driving on 03 trailblazer and then only come on if the heater output is on level 5?
You have a bad blower resister..............
Why does your heater in your car only heat when you are driving?
The heater in your car uses waste heat from the engine to heat the car. When the engine is not running there is no heat to distribute.
Why would the heater on your bravada only blow cold air?
Possible causes are, low on coolant, thermostat stuck open, clogged heater core or vacuum scorce not getting to the heater control.
What causes an ac-heater in a Nissan Sentra to only blow on high?
you need a new blower motor resistor
What causes the heater-defrost blower only ro work on high speed on a 1998 Dodge Stratus?
blower motor resistor is burned out
Why does Car heater only works while driving?
Most (not all) cars are heated by the engine. When fluid moves through the engine it heats up. This fluid moves through the heater core, a fan moves air over the warm heater coils blowing warm air out to the cars cab.
What causes heater blower to operate on high setting only on 2000 Sebring JX 25 L V6?
Defective Blower Motor Resistor Pack.
91 suzuki sidekick heater blows out cool air. how can I fix it the heater fan is fine but when I put it on hot it only blows cool air.?
This can happen if the water or coolant level in the radiator is low. There are other causes but this is the most common.
