when i have the heat on in my car, the hot air turns cold when im just idling. why is this?

Answer 1

You may need a new heater core. Could be something else. Here's something to read:

Answer 2

This is common in MANY cars. The problem is that the heater core is higher than the radiator causing an air bubble. to solve this problem:
Allow the car to cool, Remove the radiator cap, turn the heater controls to maximum hot, Have an assistant start the car & rev the engine to 1-1.5 thousand rpm. You'll notice the coolant level drop. This is because reving the engine circulates the coolant into the heater core causing the radiator level to drop. While your assistant holds the RPMs up; You can now TRUELY top up the coolant system. This should solve the problem.

Answer 3

If it was the thermostat, your car would overheat. If it was the heater core, it would be leaking.

I think you have a vacuum controlled air blend door in the ducting. This door, located in the ducting, directs heat over the heater core, the A/C coil, or a mixture of both. There isn't enough vacuum at idle, so the door is closing off the heater core. It is usually spring loaded to the cold side. Could be a one of the vacuum tubes of the diaphragm that pulls the door open.

Answer 4

coolant level is most likely low. At low engine speed water pump does not flow fast enough to supply the heater core with coolant if the coolant is low. The method to top off coolant is different for different cars check your owners manual. If you don't have access to the info then top off with the engine running and the speed up is the next best way(don't open radiator when hot!).

Answer 5

Brittany, have you ever checked your alternator? Distributor? How bearing directly to the ignition coil? those are all needed aspects of your ignition gadget and if certainly one of them is kaput then your vehicle will end to create a spark whenever you change your starter on. i could inspect the aforementioned aspects for any placed on- or plenty greater effective, in case you recognize that any of those suggested aspects have huge mileage on them, i could propose changing the climate as necessary. thankfully, aspects such via actuality the ignition coil assembly are below $one hundred at shrink value OEM Nissan aspects shops so this could instruct to be an exceedingly budget friendly answer on your difficulty. let us know at the same time as you're able to get themes began, as a thank you to speak!

Answer 6

Check your coolant level. If it's not low then your water pump is probably going out.

Answer 7

yep thermostat is possible, could also be that your water pump is wearing out and not pumping water around the system like it should

Answer 8

You probably need a new thermostat.

Answer 9

....or maybe you need to check the water level.