Heater turns to cold air when car is idling

Hello,

Okay, so are you talking about the fan coming on or are you talking about the heater itself? I am thinking that this could be a problem with the electrical connector going to the blower motor, but will wait for your answer to diagnose the problem further.

Thanks,
Alex
2CarPros

It will blow air regardless on all settings, but at idle the heat will turn to cold.

Hello again,

Does this happen just when you first start the vehicle, or even after driving it for a while and then stop and come to an idle?

Thanks,
Alex
2CarPros

From start.

Hello again,

It takes a little bit for the engine to warm up the coolant for the heater or the defroster to blow hot air. The way the heater/defroster in a vehicle works is there is a box under the dashboard with a small radiator in it. This is connected to the cooling system and engine coolant passes through it and this is where the heat comes from. A thermostat in the engine keeps the coolant in place and won't let it circulate until it reaches a pre-determined temperature, usually around 180-190 degrees. Until the coolant reaches this temperature and circulates you will not have full heat coming from your heater/defroster. This is normal in all vehicles and nothing to worry about.

Thanks,
Alex
2CarPros

But it does it at idle even after the car has heated up. It will blow heat while driving but soon as i let off the gas it cools down.

Hello again,

Okay, this sounds like your vehicle's water pump could be going out. In the diagrams down below I have included the instructions for the removal and installation of your vehicle's water pump from the vehicle manufacturer. Please go through these guide and get back to us with how everything turns out.

Thanks,
Alex
2CarPros