Q: Heat only works when im pressing the gas sometimes

asked by on March 07, 2017

The heat work fine through the seats but only provide heat through the vents when pressing on the gas in motion... sometimes.

My car has 96000 miles.

Hi There, I would suggest first checking your coolant level to be sure there is sufficient coolant in the radiator as this is what flows through the heater core which is what generates the heat you fee inside the cab of your car. You may also have a clogged heater core that may be prohibiting the outer linings of the heater core to get hot. As you know, the heater core is a series of tubes that the coolant runs through that generates the heat from the warm coolant after circulating through the motor. These tubes can occasionally develop a buildup on the inner walls such that when the heater core is "flushed" this buildup on the inner walls of the lines remains and still allows the coolant to flow through the heater core. It is important to note that when the heater core is "flushed" it is possible to get good flow through the heater core while the inside walls of the heater core remain caked with buildup. As a result, the buildup on the inner walls prevents the temperature from rising to its capability due to the insulating effect of this buildup on the inner walls which will prevent the necessary heat transfer to properly heat the inside of the car. I would recommend having an expert from YourMechanic come to your location to diagnose and replace your heater core.

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