Thermostat in my 2004 or 2006? chevy trailblazer $420???

2005 Chevy Trailblazer service manual said the same 345-395 kPa (50-57 psi)

First you need to have EBCM - electronic brake control module check for DTC'S - diagnostic trouble code's . If the light is on there is a code stored . I think most part stores can do this and for free . After you find out what code is stored , looking up that code in service repair information for diagnostic trouble shooting chart would be next step . There are a few codes too.
DTC C0035 or C0040
DTC C0045 or C0050
DTC C0110
DTC C0131
DTC C0161
DTC C0186
DTC C0196
DTC C0201
DTC C0240
DTC C0241 or P0856
DTC C0244 or P1689
DTC C0245
DTC C0283
DTC C0287
DTC C0290 or C0292
DTC C0455
DTC C0550
DTC C0558

Find the code do the diagnostic's , fix the problem , wiring issue's , a sensor , bad module ,what ever it is . The light will go out then . Here is a sample of code discription .
• DTC C0035 Left Front Wheel Speed Sensor Circuit
• DTC C0040 Right Front Wheel Speed Sensor Circuit

StabiliTrak service light - Chevy TrailBlazer, TrailBlazer SS and ...

forums.trailvoy.com > ... > 02-09 General Tech Q&A > General

Dec 24, 2009 - 11 posts - ‎7 authors
However, the StabiliTrak system seems to be working, as in my area ... If you have OnStar push the button when the Service Stabilitrak light is on have them run a diagnostic. ... 2007 Chevy TrailBlazer LS .... Choose your make. Service Stabilitrak light comes on
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code p0014 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

forums.trailvoy.com > ... > OEM Issues

Sep 8, 2007 - 11 posts - ‎8 authors
On my Trailblazer I have a code P0014 . this says Camshaft Position Actuator B ... If the desired and actual cam phase angle error exceeds its ... This diagnostic procedure supports the following DTC: ... replace the camshaft actuator solenoid, change the engine oil and filter, ... 2004 Chevy TrailBlazer LT P0014 - Camshaft Position Actuator Solenoid "Relearn"
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Tech Code "dtc P0014" 2003 Trailblazer - Chevy S-10/Blazer ...

www.gm-trucks.com/.../72278-tech-code-dtc-p0014-2003-trailblazer/

Dec 31, 2007 - 14 posts - ‎6 authors
Tech Code "dtc P0014" 2003 Trailblazer - posted in Chevy ... it had been serviced before for the same thing in 2003 or 2004! ... replace the camshaft actuator solenoid, change the engine oil and .... The extended war. co. prob. would not be to happy since they already fixed the sensor once or twice already.

Replace a Camshaft Position Actuator Solenoid Valve on a ...

? 8:05
https://www.youtube.com/watch?v=4Dkdd287AKg

Follow the radiator hose back to the engine on the top side. Where the hose connects to the engine is the thermostat housing. Remove the hose clamp and hose (when vehicle is cool). remove the housing itself and the thermostat will be right in front of you. .

The thermostat is under the alternator.

If you have a memory saver to keep radio & PCM settings, install it now.

Remove negative battery cable from battery. Remove positive cable from alternator and disconnect harness plug from alternator.

Remove accessory belt noting how it is installed for later reinstallation.

Remove engine lifting hook in front of alternator.

Remove (3) bolts holding alternator on.

Drain coolant from radiator (may want to start this as first step as it takes a while). Loosen pressure cap to aid in system draindown.

Remove radiator hose from thermostat housing.

Remove two bolts from housing and remove from engine.

Reinstall is reverse keeping in mind the following:

Cleanliness counts where thermostat housing seals to engine.
Thermostat spring should point into engine.
If the thermostat has a bleed port, it should go to the 12 o'clock position (up).

Never heard of a thermostat sensor. There is a diagnostic code that wil lbe set if the engine computer observes that the thermostat is not allowing the engine to reach operating temperature quickly enough. This code is based on information sent by the engine coolant temperature sensor. 99.9% of the time a new thermostat solves the problem. Use an AC Delco thermostat.

Service your cooling system every 5 years or 150,000 miles. The GM Dex Cool has a life of 5 years or 150,000 miles which ever comes first. Replace the thermostat also and buy the fail safe thermostat, it cost a bit more but worth it.

Service the engine (spark plugs and wire) every 100,000 miles or till engine management prompt attention. (service engine light DTC code)

Service the transmission every 3 years or 60,000 miles, replace the transmission oil and filter. Transfer case fluid and differential fluid.

Service the engine oil and filter every 6 months or 3,000 miles. Lube Chassis

Service the air filter and cabin air filter, wiper blades every 15,000 miles or once a year.

change thermostat

sounds like it could be your intake manifold gasket