Heater is not working blows cold!

Hi Mike,

When you flushed the heater core, were you able to get water to flow through it?

Here are a couple links you may find helpful:

https://www.2carpros.com/articles/how-a-car-heater-works

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

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When the engine is at normal operating temp and the heater is on high, do both heater core hoses get hot? If only one does, then there is most likely an issue with the core itself. If both are hot and you still have no heat, then suspect an issue with what is called a blend air door. That is in the vehicle and determines if you get heat or AC into the vehicle. If I recall, the blend air door on this vehicle is actuated by a cable, so make sure it is connected and moving when you change temp. I attached a pic of the actuator lever. Check to see if the actuator is moving the door when you go from cold air to heat. If it doesn't move, disconnect it and move the door by hand to see if it makes a difference. If you do get heat, then either the actuator cable is bad or disconnected at some point.

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Now, regardless if the blend door works, if there is no coolant flow through the heater core, it won't work. On the other hand, if the core is getting hot and the blend air door doesn't open, you will get no heat. So, do what I suggested first. Engine warmed up, heater on, check to see if both heater core hoses are hot. Do this first and let me know what you find. Also, the heater core will get hot regardless of the hose orientation. Coolant is simply flowing through a small radiator. Let me know if when you flushed it, if water was coming out as fast as you were putting it into the core. In other words, did water flow through it.

Take care,
Joe

Heater hoses by the firewall both should be hot to touch when engine at operating temp if not heater core need to be isolated and flushed
if both hoses hot and no hot air inside suspect blend door actuator

It is one of two things. Either the heater core is plugged or the blend door isn't working. Start the engine, let it get hot with the heater on high. Feel both heater core hoses. If both are hot, the heater core is fine and the blend door is the problem. If one side of the heater core is cool, the coolant isn't circulating through the heater core indicating it is plugged.

Check it out and let me know if you have other questions.

Joe

Heater hoses should be HOT to touch. And no heat at all even on low fan setting?

These are common for clogged heater core. Flushing both ways is fix.

First right at the fire wall with the vehicle warm feel the heater core hoses, let me know if one is hot, both are hot or if one is significantly hotter then the other.

Or they are both just warm. And not as hot as the lower or upper radiator hose.

Let me rephrase that, is the heater core hoses both the same temperature of the upper radiator hose or is the upper radiator hose hotter or colder.