HEATER NOT WORKING

Flush the heater core.

Heater problem
2006 Chevy Impala 73,500 miles

do Impala's still have thermostats? All i get is cold air and the engine temp is right in the middle (not overheating)......

With the engine at full operating temp, locate the 2 heater

hoses where they go into the firewall and feel them to see if

they are both hot to the touch. If they are..........

The heat in that vehicle is controlled by a blend door that

regulates heated air flow. it is operated by an electric

motor/actuator. The problem can be that the actuator is stripped

or inoperative or the door itself could be damaged. This is what

needs to be determined by examining the actuator and see if it

is responding to heat change commands or not.

Most of these systems will bleed the air out automatically. This wouldn't even be an issue unless there was a leak or recent cooling system repair.

my 06 impala's heater is not operating properly. not much heat comes out, but when you change the function(defrost,vent,feet,etc) none comes out for a while.

Are you refering to not much air pressure comes out or the temp of the air flow that is not very hot.

engine sounds ruff when driving,code on dash show turn off ac

Sounds like the engine is running hot . Check the cooling system . See if there is air in the system and or low on coolant.

I've been getting a knocking sound from behind the dashboard every time I change from ac to heat since last year. Now my heat doesn't work. Does the knocking sound have anything to do with it? What could be the problem?

It could be related. It sounds like something is wrong with the blend door/blend door actuator.

How to fix nockin noise on dashboard heater wont work

Can you explain what is happening? I'm not sure what you are asking.

Car running at normal operating temperature, no leaks, new thermostat. Heater hoses going to heater core are cold to the touch

it sounds like the new thermostat is stuck open or the coolant fans are running constantly

If the engine is at operating temp but the heater hoses are cold, then the heater core has to be plugged up. You can remove both heater hoses and backflush the core in both directions with a garden hose.

a clogged heater core could result in one cold heater hose but not both,outlet hose yes,but not the inlet hose.

Had "no heat at idle" a couple years ago. Had thermostat replaced and eventually heat at idle returned after cooling system air purge that I did myself. And I do not have an air bleed valve that I can find on this engine
However, this same issue has reared its ugly head again. Coolant is "full" and temp gauge is always half-way between C and H. I followed this procedure:
1. Engine cool. 2.Remove rad cap. 3. Disconnect upper heater core hose from metal pipe on engine. 4. Added coolant to pipe until full. Raised (as high as possible) rubber hose still attached to heater core and filled with coolant. 5. Reconnected heater core hose to pipe. 6. Started engine, RPM's to 1500-1700 steady. 7. Top off coolant at engine before reducing RPM's to idle speed, and replace rad cap. 8. Attain normal operating temp and check for heat at idle. Monitor coolant in reservoir. I again have heat at idle.
Why does this continue to occur? What else might be happening? Should both heater hose temps be the same? If not, which one should be hotter? Has GM ever issued a "silent" recall on this air-in the cooling system problem? Since the car was new, I've heard water "gurgling" behind dash at start-up. Strange.

if working ok both hoses should be about the same hard to tell temp without a guage of some sort. pull your hvac fuse for 60 seconds it may reset your actuators . I fboth hoses are hot then your actuators aren't working correctly. It cold be a control head not sending power or the actuators themselves. pictured is rh one it can be replaced by dropping glove box door and letting box come all the way out.