Heater not working

A/C works, Defroster works hot, no heat at floor? Manual heat control. No heat at floor even on blend Def/heat, all defrost. I have hot air, just not at the floor. Please help!

Under the dash, I see 2 vacuum actuators that appear to be working when changing the control switch, from floor to defrost. Is the actuator bad or the door the problem? And best way to repair? Please and Thank You.

My 2000 blazer recently developed aheat problem, my heater throws no heat, and I have already put the new thermostat. Blower motor blows great but no heat.

My blazer is a 2000 with only 76,000 miles. I turned the heat on this morning, but no heat came out. It was cold air for about 10 minutes. I know it takes time to warm up, but usually by the time I get to work it is warm. But it wasn't. What should my husband do to fix this?

Why not replace the thermostat first. 99% of time that is problem.

I've never had a core plug up. What causes the blower motor and wipers to both quit working at the same time?

Heater gives low heat.

One hose gets hot the other stays low.
If I turn the ac/heat all off both hose get hot.
I also checked radiator hoses I heat up the engine the hose on the bottom stays cold.
Temperture stays on 200 F
Is the thermostat broken?

Hope that somebody can help me het is getting cold in the Netherlands.
Thanks Gus

Always start with the basics. Check coolant level and condition, leaks, hose condition (soft/mushiness), listen for any strange noise ( tapping or gurgling) from running engine, and coolant smell. You may wish to have a cooling system / radiator cap pressure test done. Also have the tech check the coolant for voltage. (This will sometimes happen to old coolant that has acid build up.)

If the lower radiator hose is a constantly cold, that is the biggest clue. Make sure your tech knows.

Concentrate on these three possible areas: Radiator core restriction or collapsed hose. (Have tech use IR gun to check for hot and cold spots.), Water pump impeller / bearing problem. (Creating restriction or low flow.), Lastly, the thermostat.

Always have the tech do the basic cooling system inspections. There could be more than one problem. Always have the cooling system flushed when service is taking place.

Thanks for your information next week the car goes for service to my garage.
If printed your advice so he will be notifited.

Thanks
Gus Peeters

Thanks for your information next week the car goes for service to my garage.
If printed your advice so he will be notifited.

Thanks
Gus Peeters

I drove for 6 six days with barsleak in the system then the mechanic flushed the system with water the sludge came out.
Fild the system with new coolant heat up the engine and yes the heather is hot and the interieur getting warm I mean hot.
So problem solved the mechanic told me he did a hundred cars with the same problem.
Japanese german american cars so it's not a Chevrolet problem.
Thanks for you support and have a nice christmas.
Greetz Guus

My heater blower works but only blows cold air. I had the thermostat replaced a it was stuck open, heater worked with warm air for one day and then it went back to blowing cold air only.

Temp gauge is normal cooling system full, no air not sure about hoses to core. Worked fine after thermostat was replaced but only for 1 day

Blend door actuator is bad. I dont have proper tools to change it (need 7/32 either offset wrench or swivel 1/4 ratchet) cant afford shop right now. Anyway I took off the vac unit that goes to the door (it was easy just clips on) and I used a piece of wire to make the door stay on the hot side. It still only gets slightly warmer than outside air. So I checked the coolant (full) and flushed the heater core for good measure. Still no improvement. Please help.