Service Eng /low Coolant Temp/thermostat

Hello some help please , I have a 2003 S-10 4 x 4 4.3 Vortec motor the service engine light come on then go out then comes on then goes out had the AUTO ZONE check it said its LOW COOLANT temp so reading some of the old posts on this great site w/ great PEOPLE I'm thinking it's a Thermostat, ? RIGHT ok where is the thermostat and how hard to change I'm mechicanical enough to change it out just looking for some DIRECTION thanks :runaround: as all ways you People are the biggest help THANKS ANTHONY

What was the code no?
Is it low on coolant?
Or just low tempture reading.
Sometimes on will cause the other.
If full of coolant and tempture is low go for a thermostat.
If low on coolant find the leak.
The theromostat will be on the end of upper hose to intake.

Yes replace the thermostat, follw the upper radiator hose to the intake, and there it will be. Two 13mm headed bolts hold it on, and it uses an o-ring seal, so it will be a very easy job for you!! But like MT-2500 said, make sure the coolant is not low, and if it is you will want to fix the leak, but replace the thermostat also! Good luck.

while im in there I should do a coolant change It has not been done in a long time if ever whats the easyest way to flush the system wheres the drain plug or petcock thingie thanks