My 2006 V6 Impala isn't throwing any heat. Could

2006 Impala Coolant Sensor Replacement
This may, or may not, help you locate the sensor.
The video is for a 2006 Chevy Impala that has the 3.9 v6 engine.
Hopefully one model year difference did not change the engines...

Removal & Installation - AutoZone

www.autozone.com/.../Lincoln-LS.../_/P-0996b43f802e888d

AutoZoneLincoln LS 2000-2005 ... If installing a new A/C compressor, the A/C clutch disc and hub , A/C ... If flushing of the air conditioning system has not been performed, recover the refrigerant. ... Remove the bolts and lower the A/C compressor. ... The torquespecifications of the A/C manifold and tube assembly-3.0L engine shown.

2006 CHEVROLET IMPALA 3.9L V6 Auto Parts - RockAuto

https://www.rockauto.com/.../x,carcode,1438246,d,2006_CHEVROLET...

RockAuto has parts for your 2006 CHEVROLET IMPALA 3.9L V6 and all ... Who needs AutoZone or NAPA when all the parts your car will ever need are right here? ... 2006 CHEVROLET IMPALA 3.9L V6 Electrical-Connector Parts, A/C and .... IMPALA 3.9LV6 Suspension Parts, Ball Joint Caster / Camber Cam Bolt Kit Coil

possible
stuck thermostat

The thermostat housing is located on top and front of the engine. You will see a large radiator housing coming from it. There are 4 bolts to open the housing (15mm) and hose clamp(s) to loosen on the radiator hose. Once removed just pull out the 2 thermostats. When you are replacing the thermostat(s)-the gasket(s) for the housing are on the attached to the new thermostats- As you probably noticed when pulling out the old ones.

I hope you have had more problems than just this before you dismiss a car brand.
Do you know if the engine is heating up ? Is the cooling system full of coolant ? Are the heater hoses getting hot ?
If the system is heating up the problem could be a faulty blend door under the dash.

New for 2006 Chevrolet Impala The 2006 Chevrolet Impala receives a 211-horsepower 3.5-liter V6 for the LS and LT trims, with a 242-horsepower V6 standard for the LTZ and optional for the LT. The Impala SS is powered by a 303-horsepower 5.3-liter small-block V8 with Displacement on Demand technology. Updated exterior styling includes new front and rear fascias, headlights, and taillights. Inside the 2006 Impala features flip-and-fold rear seats, new instrument panel that wraps into the door panels, and standard side-curtain airbags

What is a vehicle RPO code?
A Regular Production Option (RPO) is a General Motors standard coding for vehicle configuration options. These codes are a combination of 3 alphanumeric characters and refer to a specific option or modification to the vehicle. Engine Coolant Thermostat Replacement (RPOs LZE/LZ4/LZ9)
Sticker on door jam .

3.5 L lower radiator hose

Replace the thermostat. the temperture should be at the 190 to 200 mark

it is on drivers side of block on hose-block connection, pain in **** to change. there are 2 -10mm bolts..good luck

Had the same problem with my 2006 Impala with the 3.5 engine - there is an air pocket in the heater core. With the engine cold, remove the upper heater hose (marked with blue tape in the picture) and add water to the hose until coolant comes out of the metal cross-over tube. Fix takes 5 minutes…all you need is a pair of pliers and a funnel.