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www.popularmechanics.com/cars/how-to/a3270/whats-wrong-with-my-cars-heater...

This heater core then passes the hot air it generates into the vehicle with a blower fan. Many different things can go wrong here causing the whole system to work poorly or not at all.

www.bryantmotors.com/car-buying-guide/reasons-car-heater-not-working.html

Car heater problems are also frequently associated with heater core difficulties: coolant may not be traveling through the heater core properly, the air from the blower motor is not reaching it or there’s a clog in the small tubing of the heater core.

axleaddict.com/auto-repair/Why-Are-My-Car-Heaters-Blowing-Out-Cold-Air

My 2005 Toyota Matrix X-rays. My heater is not that hot on the driver side and on the passenger side car in t is cold. Can u please tell me what the problem of s. My car does not over heat. The hoses going to the heater core r hot under the hood and they r hot in the cabin. Need help please

www.lifewire.com/car-heater-suddenly-stopped-working-534657

Car heaters that don't blow at all. When a car heater doesn't blow at all, the problem is either a bad blower motor or something preventing power from getting to the blower. If the blower motor is getting power, it's probably a bad blower. If it isn't getting power, suspect the fuse, switch or blower resistor.

www.autobytel.com/.../reasons-your-car-won-t-heat-heater-stopped-working-104219

Reasons Your Car Won't Heat | Heater Stopped Working Heat in automobiles is supplied by hot coolant circulating through the engine. A small amount of hot coolant is diverted into a hose fitted into the firewall and then into a small heat exchanger or heater core.

community.cartalk.com/t/car-heater-does-not-get-hot/39583

My car heater does not get hot. When I turn on the heater on high it will only get luke warm. When I drive it, it goes cold. Ran water through the system and it goes through fine.

www.2carpros.com/articles/car-heater-not-working

Step 8 - The heater core is responsible for converting hot coolant into heated air, if this core becomes plugged it will not operate correctly. To check for a plugged heater core, start the vehicle and allow the engine to warm up to normal operating temperature while turning the heater to its hottest setting.

www.justanswer.com/oldsmobile/1vdk2-car-heater-not-hot-enough.html

Heater cores blocking up is not very common in this car. They usually are good until the spring a leak which you will notice by your windows fogging up and not going away. Seems like you have 2 issues, summer issue which is probably First or Second Repair and the winter issue is probably First or Third Repair.

www.yourmechanic.com/question/heater-not-blowing-hot-air-only-warm

The most common causes of poor or no heat conditions would be (but not limited to) low coolant level, a restriction in the cooling system, faulty blend door actuator, or faulty heater control valve.