My heater is not working why?

Yes I can feel the air blowing from the vents and the speed matches the blower setting. I just replaced the thermostat this evening but it is still blowing cold air.

Thank you I checked the temperature blend door actuator and had it replaced by my neighbor not he heater works! YA! I love this site.

My 2001 Blazer heater will not heat. Engine warms up. Fan works, but only cold air. There were no symptoms -- just started.

Temp guage shows the engine gets up to temp. Neither heater hose has ball valve. Cables seem ok.

Heater in 2001 chevy blazer is not working correctly? Blower works but air does not get warm.

It's currently in the low 40s. I start my car to defrost it for 10 minutes. I come back out and the windows are not defrosted. I switch to the fan with the heat on and I get cold air. Same thing when I switch it to the AC. What are some possible causes for this issue and what would I be looking at in cost for repair (Unless it's something any person can fix)? Thanks.

Awesome. I'll check that. Thanks!

The heater in my chevy is not working. I have changed the thermostat, the coolant level is full. I believe the heater core is fine. I think it may be air mix mode door may be stuck and not shutting all the way. Where can I located? And is this possible?

Hello,

Having problems with getting heat to blow out of the vents.

When I turn the heat on, I only get cool air.

When the blower motor is turned on, it sends air to where I direct it via the knob. Defrost, leg, etc.

The A/C works properly.

A little more in depth,

- The lines that run off the heater core from the firewall do not get hot at all. The line that should feed coolant into the heater core (off the intake manifold) does not even begin to get warm, needless to say the return line back to the water pump is cool as well.

- The truck is not overheating. It also does not take a real long time for the truck to get up to temp. I don't think it's the themostat.

- I do not smell coolant in the cab of the vehicle.

- I flushed the heater core only a few months ago, with pressure (water nozzle). I was actually surpised that I did not get a lot of nasty gunk coming out like you hear a lot of folks talk about.

- I replaced the thermostat less than 2 months ago.

- The intake manifold was replaced a little before I did the thermostat.

- Coolant levels are full in radiator and overflow tank.

- Upper radiator hose get plenty hot.

I plan on grabbing a new rad cap and reflushing the heater core, just as a "hey, this is the easy stuff to eliminate first" kind of thing.

Will probably take the inlet heater core hose completely off (from firewall and intake) and see if thats clogged.

- This was an intermittant problem when it really first began. I could not get heat to come out the vents on the way to work in the morning but on my way home I was then getting heat.

- Could it possibly be the water pump?

- I have read through a haynes manual (not very useful for this topic) the only thing I did find was a mention of a way to test the water pump was to just basically see if those 2 lines were warm.

My blazer has no heat have changed thermostat2 times flushed everything changed antifreeze heat in hose going to heater core very little heat in hose coming out fuses are fine what's my problem?