Heater not working properly?

Hello,

It sounds like a temperature blend door actuator has let go. Here is a guide to help you see what you are in for when changing it and the diagrams below to show you how ti will be on your car

https://www.2carpros.com/articles/replace-blend-door-motor

and

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

Check out the diagrams (Below)

Please get back to us.

Cheers, Ken

No heat when outside temperatures are really cold. When the engine warms up I do get heat if i really step on the gas. sometimes when i let my foot off it goes back to cold air. I changed thermostat and coolant. No help.

The two small hoses going into the heater core at the firewall when the engine is at operating temp.Are they both getting too hot to hold?If one is but the other isn't the flow in the heater core is restricted.Do you know if coolant stop leak has ever been used in the radiator?

Both hoses are hot. Stop leak never used. Thanks. Im leaning toward the water pump.

Are both getting too hot to hold?the water pump is a Kong shot if the pump wasn't circulating enough coolant I would think you would be having overheating issues.

Has cooling system been back flushed since new? Not drained and refilled.

Not flushed. Only drained and refilled. Temp not going all the way up now. Only halfway. I thought that was due to the ice cold temps outside but not that its warmed up a little outside, engine temp not going up to normal. Ugh!
Thanks for your help

Maybe you got a bad new thermostat

It's happened before on another car. Thanks for all your help. Happy New Year.

thermostat has my vote also

That's to check if a thermostat isn't opening sounds like the thermostat is allowing flow when it shouldn't.Like a bad seal or partially stuck open.

keep us posted here at 2carpros, one more thing is cooling fan cycling properly

Yes! I got heat. Tons of heat. Faulty thermostat i got at AutoZone. Picked up a new Stant thermostat today.I need this old van to haul my gear for ice fishing. Got bait.I'll be on lake tomorrow. Thanks for everything.

Glad to hear it I always get the start thermostat when I buy them.Let me know how the fishing goes tomorrow.

why would there be no heat? - thanks for your help

It could be a couple things. First, with the engine hot and the heat on, feel both heater core hoses. Both should be hot. If only one is hot, flush the heater core. If both are hot, check the blend door. Chances are it is stuck.

Hi, I realize this is an old question, but I have a similar problem. What is the next step if both hoses for the heater core are cold? The hose from the radiator to the manifold is hot.

As I was driving home my heater started blowing cold air and the temp gauge started climbing. There was a really bad smell

Those are all indications of a leak in the cooling system. Have you looked for a leak?

I have not, I will in the morning

My fan blows air but no heat. Even after letting my vehichle warm up I can drive 30 min. and still have no heat. Sometimes it will click in after 25 min. but that's not very often. I could always hear a click whenever the heat was about to start but I no longer hear that click. I've been told it could be a heat relay sensor. What do you think and can it be installed on our own?

Have the blend door checked. It sounds like it is sticking. It is a vent door that directs air either for the AC or ovet the heater core. If it isn't in the right position, you get cold air.

NOTE: I am assuming that the engine warms up to normal operating temp, and both heater core hoses are getting hot with the engine running, hot, and the heater on. If this is incorrect, let me know.

Joe

I was having a problem with my heater not working; joined by an antifreeze leak. I have since had a new radiator , thermostat, and water pump installed. My heat still doesn't work and my car keeps overheating but when I go to check the coolant, it's not low. I also turn on the heat when the car overheats and even at that point; no heat comes out when doing that either. When the car overheats there is never steam or smoke either. I don't know what else to do and it's freezing where I live!

check to see if both heater hoses are hot if they are check temp actuator in car it may be in the wrong position. pull the hvac fuse in car for 60 seconds with key on and reinstall it may reset it . if not have apro look at it.

The heater in my caravan is acting strange! the passenger side is fine-it blows hot or cold depending on the position of the control lever but the drivers side only blows cold air. I have backflushed the heater core already to no avail and I am wondering about accessing the actuator doors. Is this a huge repair and what componets are involved? Any help you could give me would be appreciated!

blend door motor for driver side may be at fault. they are common failures with dual controls.

bolted on outside of the heater case but a pain to get to and replace

Roy

we have replaced or thermostat twice our 2005 dodge caravan it blows cold air still! after quite awhile it will heat up. what do we try next?

Check the heater core if its clogging up and also the air blend door/actuator if its on the heat position-if okay could be coming from the HVAC control module, vacuum/actuator problem-

The temperature gage indicates engine is at operating temperature, but the front interior dash heater blows cold air. What is the problem?

Inspect coolant level to ensure it is full. If OK, inspect heater core hoses. The two heater core hoses are leading to the heater core through firewall, under hood. With engine warm and heater on high setting, feel these two hoses and ensure both are warm to touch. If only one is warm or neither are warm, this indicates a faulty heater core. Let me know what you find with these two inspections and I will follow up.





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