The driver side blows heat but the passenger side blows cold air

Yes the hose is warm and the coolant is full the radiator was flushed today all of that has been checked please help me and thank you

What does the temp gauge read (the one that looks like a thermometer [most times])?

Was the heater core flushed? I flushed the heater core on my Blazer and the heater is hotter than ever. Take both hoses off that are coming from the radiator and hitting the fire wall. Get your water hose and put it on one and then the other. Your going to get wet but it will work. If that is not the case then check the thermostat. Thanks

My heat is luke warm. Both hoses ontop of the motor get hot.I changed the thermostat.I filled the antifreeze.I have no water on the passenger side floor and the blendor box is blowing out fine. Could this be a early onset of issues with my heater core or waterpump? Its getting cold out and I cant drive my truck because it takes 40min for the temp to go up in the truck.

The heater/defroster in my Tahoe quit producing heat last week. The fan still works fine just no heat. I check the HVAC fuses and they appear to be intact. Any suggestions?

Thanks Joe,
I determined that I wouldn't be able to fix the problem myself so I took it to the local auto shop. They said the heater core was probably plugged so they flushed it. Everything works fine now.
I've used your website before and found you guys to be very helpful.
Thanks again.

I have no heat. The vehicle runs at its normal temp (around or just under 210). I have changed the thermostat about 2 years ago. I checked the blend door actuator and it is working. I had the cooling system flushed last week. Both hoses from the heater core get hot which to me suggests that it isn't stopped up. Before I had the cooling system flushed last week, I did have heat when the vehicle was running at 55mph but when I was going slower or especially at idle speed it would blow cool air but now since I had the system flushed I have no warm air at all at any speed.
My thoughts are either air pockets in the system or possibly the flap the opens & closes for hot or cold air is broken. I don't know if the vehicle has a bleeder valve or not. It has the closed radiator. Is there a fuse that controls the hot air that could be blown or is there some other logical explanation for my problem?

Ok, I pulled the hvac fuses like you said with the key on and waited 60 seconds and then reinstalled. I had to let the engine warm up but still no heat. It might be a touch warmer than the air outside, especially when you first turn on the blower but it quickly goes back to cool.
As I mentioned in my initial question, I have already checked the blend door actuator and it is functioning. I removed it and also manually turned the piece that the actuator turns. You can hear the door closing but it slams. Once you turn the engine on you can no longer turn it with your finger. I guess it does like a vacuum on it.
Is the door plastic? How can I check to see if it is broken? Or is it possible that it's air trapped in the system?

What are the possible cause for no heat coming into cabin to the vehicle. Cabin air filter was change?